A Schlage key system is not just a set of keys and locks. It is an access management architecture that determines who can open which doors, how easily keys can be duplicated or controlled, whether a building can be rekeyed without disassembling every lock, and what happens when a key is lost. Understanding the options before specifying cylinders prevents the two most common and most expensive mistakes: ordering SFIC cores when Grade 1 Security is required, and specifying open keyways when restricted key control is the actual need.

Security Parts carries parts for the Schlage CS210 Series interconnected lock (lever kit 06-242, Plymouth rose 08-029-PLY, Saturn rose 08-029-SAT, strike combinations 10-109 and 10-121, deadbolt strike 10-116), the Schlage HL6 Series hospital push-pull latch (mortise and tubular paddle assemblies, engraved and non-engraved, bent tab mortise strike kit), and the Schlage THP/LT Series tubular lock latches (THP-8201 spring latch, THP-8219 privacy latch, fire-rated versions with -F suffix). The CS210 B500 supports SFIC; the B60 does not. The HL6 key override anti-barricade function is available on three functions and is the critical safety feature for behavioral health environments.

Three Schlage product lines cover the doors that standard cylindrical and mortise locks do not. The CS210 interconnected lock addresses the NFPA 101 single-motion egress requirement on multifamily apartment entries where both a deadbolt and latch are required. The HL6 hospital latch addresses healthcare corridor doors where staff need hands-free operation and 50 percent quieter paddle action. The THP and PT Series tubular latches provide the latch assemblies that keep interior residential and light commercial doors functioning correctly. Each line has specific parts requirements and ordering decisions that differ from standard cylindrical lock parts.

Browse the complete CS210 interconnected lock parts catalog, HL6 hospital latch lock parts catalog, and tubular lock parts catalog at SecurityParts.com. For the full Schlage commercial hardware range, browse the Schlage commercial hardware catalog.

Schlage CS210 Interconnected Lock: What It Is and Why It Exists

The Schlage CS210 is a Grade 2 interconnected lock designed exclusively in the CS210 entrance function (B500 commercial or B60 residential deadbolt housing with single-cylinder entry). The interconnected design solves a specific code problem on multifamily residential doors: building codes and NFPA 101 require that doors on means of egress can be opened in a single motion from the inside. When a door has both a separate deadbolt and a separate latch lock, the occupant must turn the deadbolt and then the latch lever separately to exit. That is two motions, which does not comply with single-motion egress requirements.

The CS210's mechanical link between the deadbolt and latch bolt resolves this: turning the inside lever once retracts both simultaneously. The exterior side maintains normal security: the deadbolt requires a key, the latch requires a lever. But from the inside, one motion provides immediate egress regardless of whether the deadbolt is locked.

CS210 Specifications and Key Technical Details

Deadbolt and Latch Dimensions

The CS210 deadbolt is a 1-inch throw with a 1-inch diameter housing. The faceplate is dual option (square corner standard, round corner included in the package), 1 inch by 2-1/4 inches. The deadbolt requires a 1-inch edge bore.

The latch bolt is 1-5/8 inch by 2-1/4 inch with a dual option faceplate. The backset is adjustable and fits both 2-3/8-inch and 2-3/4-inch door preparations, eliminating the need to specify backset at order time for most standard door configurations.

Adjustable Escutcheon for 4-Inch and 5-1/2-Inch Door Preps

The CS210 includes an adjustable escutcheon that supports either 4-inch or 5-1/2-inch center-to-center door preparations from the same unit. This is an underappreciated practical specification advantage on multifamily renovation projects where existing doors may have been prepared for different center-to-center dimensions by different manufacturers over decades of construction. The single adjustable escutcheon eliminates the need to specify the exact existing door prep at the time of order, reducing re-order rates on renovation projects where the existing door prep has not been documented.

Door Thickness Range

The CS210 accommodates standard door thicknesses of 1-3/4 inches to 2 inches. The 1-3/8-inch door thickness version is available but must be specifically noted at the time of ordering. Most commercial and multifamily doors are 1-3/4 inches, so the standard version covers the majority of applications. When the CS210 is specified for older wood-frame residential construction where 1-3/8-inch doors remain common, the thinner door specification must be confirmed before ordering.

Cylinder Options and the SFIC Limitation

The CS210 is available with conventional 6-pin cylinders (standard S123 keyway, keyed different), Full Size Interchangeable Core (FSIC) cylinders, and Small Format Interchangeable Core (SFIC) cylinders. The choice matters for key system management.

SFIC cylinders allow the core (the inner cylinder with the keyway and pins) to be exchanged in the field in seconds without any tools or disassembly of the lock. This rapid core exchange makes SFIC the preferred choice for high-security institutional applications where rekeying must be completed quickly after a key loss event.

CS210 Parts Reference

Schlage HL6 Hospital Latch: Parts and Critical Design Features

The Schlage HL6 is not a cylindrical lock or mortise lock in the conventional sense. It is a push-pull latch designed specifically for healthcare environments where the operating format of standard levers is inadequate. A lever requires a gripping and rotating motion. A paddle requires only a push or pull with any part of the body including elbow, forearm, hip, or foot. This hand-free operation capability is not optional on many healthcare door applications: infection control protocols in ICU, surgical, and isolation environments prohibit hand contact with door hardware except through gloves.

HL6 Versions: Mortise vs Tubular

The HL6 Series comes in both mortise and tubular body versions. The mortise version uses the Schlage L Series chassis and mortise door preparation, providing superior strength and the full range of function options. The tubular version uses a standard tubular bore preparation, making it retrofittable to existing hollow-core residential-style doors in renovation applications without requiring a mortise pocket.

Parts at SecurityParts.com for the HL6 include cover assemblies (the decorative cover over the latch body), mortise paddle assemblies (engraved and non-engraved), tubular paddle assemblies (engraved and non-engraved), and the bent tab mortise strike kit for the mortise version.

Engraved vs Non-Engraved Paddle Assemblies

The HL6 paddle assembly is available in two surface finishes: non-engraved (smooth paddle face) and engraved (textured or marked paddle face). The engraved version provides a tactile surface and is required by some healthcare facility infection control standards that specify textured surfaces on frequently touched hardware to reduce smooth-surface pathogen transfer. The non-engraved version is appropriate for facilities that prefer a smooth aesthetic surface or where the engraved texture is not specified.

When replacing a paddle assembly on an existing HL6 installation, confirm whether the existing paddle is engraved or non-engraved before ordering, since both types are available in the parts catalog at the same product positions but are distinct assemblies.

The 50 Percent Quieter Redesign

Schlage redesigned the HL Series to achieve 50 percent quieter paddle operation compared to the previous product. This noise reduction is a documented clinical benefit: hospital noise levels directly correlate with patient recovery outcomes and staff performance accuracy in multiple clinical studies. Door hardware noise in patient corridors is a contributor to the ambient noise environment that regulatory standards (specifically ANSI/ASA S12.60 and Joint Commission environment of care standards) measure and regulate.

When replacing a paddle on an existing HL6 installation, the replacement paddle assembly from the current parts catalog carries the quieter design. If the facility is replacing older pre-redesign HL Series hardware with current HL6 parts, the noise level reduction is a verifiable improvement that can be documented for Joint Commission environmental surveys.

Key Override Anti-Barricade Function

The HL6 optional key override allows an outside key to retract the latch or deadbolt even when the inside thumbturn is actively held in the locked position. This function exists specifically for behavioral health and psychiatric care environments where a patient may use the inside thumbturn to prevent staff from entering during a self-harm event or mental health crisis.

Standard locks (including standard mortise and cylindrical locks) cannot be opened from the outside when the inside thumbturn is being held. A patient who turns the thumbturn and holds it effectively barricades the room. The HL6 key override breaks this barricade without requiring staff to force the door. Available on three HL6 functions. This is a joint healthcare design requirement that involves input from clinical staff, risk management, and facility management on any behavioral health project.

HL6 Parts Reference

Schlage THP and PT Series Tubular Lock Latches

The Schlage THP (Tubular Hardware Product) and PT Series latches are the latch assemblies used in the Schlage LT Series decorative tubular locks and related families. These are not complete locks: they are the latch component that installs in the edge bore and provides the spring-loaded bolt that holds a door closed. When the lever or knob is turned, it activates the latch to retract the bolt.

THP-8201 Spring Latch: Standard Passage Latch

The THP-8201 is a spring latch (passage function) for tubular lock installations. It is the most commonly replaced tubular latch component because the latch bolt is subject to direct physical stress on every door cycle: the bolt must retract on lever operation and spring back to extended position when the lever is released. Over years of high-cycle use, the spring loses tension and the bolt may not fully extend, causing the door to not latch reliably.

The THP-8201-CH uses a 2-3/8-inch backset (standard for interior residential and light commercial doors). The fire-rated version is THP-8201-CH-F. The THP-8301-CH uses a 2-3/4-inch backset (standard for commercial doors). Ordering the wrong backset produces a latch that extends to the wrong position for the strike, causing either the door not latching or the latch hitting the strike face rather than engaging the strike pocket.

THP-8219 Privacy Latch: Anti-Lockout Design

The THP-8219 is a privacy latch with a restoring function that prevents accidental lockouts. In standard privacy sets (bathroom and bedroom locks), the inside push button or thumbturn locks the outside lever. If the inside button is accidentally pressed and the door closes, the occupant is locked out. The privacy latch restoring function means the privacy mechanism automatically releases when the door is opened from the inside, requiring the privacy lock to be deliberately re-engaged on each use.

The THP-8219-CH uses a 2-3/8-inch backset. The fire-rated version is THP-8219-CH-F. The 2-3/4-inch backset version is THP-8319-CH. When ordering any THP-8219 replacement, measure the backset of the existing latch before ordering. The same door that uses THP-8201-CH for passage will use THP-8219-CH for privacy, matching backsets throughout a project.

Backset Selection: The Only Critical Measurement

The backset is the single measurement that determines which THP latch to order. It is measured from the edge of the door (where the latch bolt projects) to the center of the cylindrical bore hole in the door face. Two standard backsets exist:

2-3/8 inch (THP-8201-CH, THP-8219-CH): Standard for interior residential and light commercial doors. Interior hollow-core doors in apartments, hotel rooms, offices, and classrooms typically use 2-3/8-inch backset.

2-3/4 inch (THP-8301-CH, THP-8319-CH): Standard for heavier commercial doors including hollow metal and solid wood commercial doors. Most commercial lever lock installations on 1-3/4-inch hollow metal doors use 2-3/4-inch backset.

Fire-Rated THP Latches

Fire-rated versions of THP latches add the -F suffix: THP-8201-CH-F and THP-8219-CH-F. Fire-rated latches are required on doors with UL-listed fire door assemblies. The fire-rated latch uses materials and construction that maintain the latch function under the elevated temperature conditions of a fire event, preventing the latch from failing prematurely and allowing the door to remain latched (providing the fire separation) longer than a standard latch would under fire conditions. Installing a standard non-fire-rated latch in a fire-rated door assembly invalidates the UL listing of the assembly.

LT Series Tubular Locks: Coordinated Appearance with L Series

The Schlage LT Series tubular lock is designed specifically to match the appearance and lever family of the Schlage L Series mortise lock. This is a significant specification detail for projects where some doors use L Series mortise locks (high-security entries, stairwells, main corridors) and other doors use lighter-duty tubular hardware (utility rooms, storage, interior corridors). Matching the lever design, finish, and rose style across both series creates visual consistency throughout the building that is otherwise impossible when mixing hardware families.

The LT Series uses the same lever designs as the L Series, manufactured from solid brass or solid stainless steel for the same weight and feel as the mortise hardware. Levers move both up and down (not just down as on many tubular locks), matching the bidirectional lever operation of the L Series. The inside lever operates independently from the outside lever, providing a higher-end operation where inside lever movement does not affect the outside lever position.

When the LT Series is specified as part of an L Series project, THP latch parts ordered for the LT Series should match the backset, latch function, and fire-rating requirements of the door the LT Series lock is installed on. The THP latch is the only replacement component needed for most LT Series service calls because the LT Series chassis and lever are robust enough to outlast the latch spring in most commercial applications.

Browse the complete CS210 interconnected lock parts, HL6 hospital latch parts, and tubular lock parts at SecurityParts.com. For the broader Schlage hardware range including ND Series cylindrical lock parts, L Series mortise lock parts, B Series deadbolt parts, and CL Series cabinet lock parts, browse the Schlage commercial hardware catalog. Pre-order support is at 845-935-0301 or the contact page.

Related Parts and Products at Security Parts

CS210, HL6, and THP locks appear alongside standard cylindrical locks, deadbolts, and door closers throughout commercial and healthcare facilities. Most building service calls cover multiple lock product lines simultaneously.

For Schlage ND Series and ALX Series cylindrical lock parts on secured corridor doors in the same building, browse the cylindrical locks catalog. For Schlage L Series mortise lock parts on main entries and high-security doors, browse the mortise locks catalog. For Schlage B Series deadbolt parts on secondary exits in the same facility, browse the deadbolts catalog. For Schlage CL Series cabinet lock parts on medication storage and filing cabinets in the same key system, browse the cabinet locks catalog. For LCN door closer parts on fire-rated corridor doors in the same building, browse the door closers catalog.

Browse the complete all products and parts catalog to source Schlage, Von Duprin, LCN, Falcon, and Detex hardware across the complete facility in a single session.

Every commercial building has a maintenance schedule for HVAC, plumbing, and electrical systems. Door hardware almost never makes that list until something goes wrong. A door that will not latch during a fire drill, a closer that slams hard enough to break the door frame, or an electric strike that stops responding to the access panel at 6 AM are all symptoms of the same problem: deferred maintenance on hardware that is used hundreds of times every single day.

Security Parts carries parts for the full LCN 4000 Series surface-mounted closers: 4010 (pull side regular arm), 4020 (top jamb), 4030 (universal moderate traffic), 4040/4040XP (heavy institutional), 4050A (cast aluminum heavy duty), 4110 (parallel arm with EDA), and 4000T (pocket door). Also covered: the 2210 Series high-security overhead concealed closer for correctional and vandal-prone environments. The 4010, 4020, and 4110 are application-specific: mounting and handing must be specified at order time. The 4040XP and 4050A are non-handed. All big-body 4000 Series use the Fast Power Adjust indicator system. The 4010/4020/4110 use a flat-sided oval spindle; the 4040/4040XP use a six-sided hex spindle. Arms are not cross-compatible between these spindle types.

The LCN 4000 Series is the heaviest-duty surface-mounted closer line in the LCN catalog. Where the 1000 Series (1260 and 1460) serves light-to-medium commercial applications, the 4000 Series covers everything from moderate-traffic institutional interiors through the most demanding high-abuse applications in government, healthcare, and correctional environments. Each model in the series is engineered for a specific mounting position, and this specificity is the most important part of understanding how to order correct replacement parts.

Browse the complete LCN parts catalog at Security Parts. For the full LCN door closer and automatic operator catalog, browse the commercial door closer parts catalog.

Application-Specific vs Universal: The Core 4000 Series Decision

The LCN 4000 Series divides into two categories that determine the ordering process. Application-specific closers require the installer to specify mounting position and door handing at order time. Universal closers can be installed in any mounting configuration after they arrive in the field.

Application-specific 4000 Series: The 4010, 4020, and 4110 are each engineered for one mounting position and one only. The 4010 for regular arm pull side, the 4020 for top jamb, the 4110 for parallel arm push side. Ordering a 4010 and trying to mount it top jamb produces a door that cannot close correctly because the arm geometry and cylinder orientation are specific to the pull-side mounting template.

Universal 4000 Series: The 4040XP, 4050A, and 4030 are universal or near-universal, meaning they support multiple mounting configurations from the same unit. The 4040XP and 4050A can be installed hinge pull side, top jamb push side, and parallel arm push side from the same closer. The 4041P (4040XP equivalent) and 4031P are the fully universal options within the 4000 family.

LCN 4000 Series: Every Model Explained

LCN 4000T: Pocket Door Closer

The LCN 4000T is the specialty member of the 4000 Series family, designed specifically for pocket doors that slide into a wall cavity rather than swinging on hinges. It is the only LCN surface-mounted closer in the 4000 Series built for this application. Arms, cylinders, and cover parts from other 4000 Series closers are not compatible with the 4000T because the mechanical interface for a sliding door is fundamentally different from a swinging door configuration.

The Spindle Geometry Problem: Why Arms Fail to Fit Across 4000 Series Models

The most expensive and most avoidable parts ordering mistake in the entire LCN 4000 Series catalog happens because of the spindle geometry difference that is never documented in buyer-facing parts content. Three distinct spindle shapes exist in the LCN lineup, and arms are machined specifically to one spindle shape.

The practical consequence of this table: a technician who replaces a 4040XP on a door with a 4010 cannot use the existing 4040XP arm. The 4040XP hex spindle arm will not engage the 4010 oval spindle. The technician must order a new arm for the 4010. And conversely, if a 4010 is replaced with a 4040XP, the 4010 oval spindle arm cannot be reused on the XP's hex spindle. A new XP-specific arm is required.

LCN 4000 Series Parts Reference

Cylinder Assemblies

Every 4000 Series closer cylinder assembly part number follows the series naming convention. The 4010 Series cylinder is 4011-3071 (with the 6 suffix for size 6: 4011(6)-3071). The 4010 also supports a delayed-action version (4011-3071DEL) and a TEL (time-elapsed latch) version (4011(6)-3071TEL).

Key cylinder assembly variants available across the 4000 Series include standard, delayed action (DEL), temperature-equalized latch (TEL), and fire-rated versions. When ordering any cylinder assembly replacement, always confirm whether the existing installation uses a standard or specialty variant before placing the order. A standard cylinder replacement on a door that had delayed-action will produce a door that latches immediately rather than after the delay the occupants expect.

Cover Part Numbers: The -72 Convention

LCN door closer cover part numbers follow the convention of series number followed by -72 for the standard plastic cover. The 4010 plastic cover is 4010-72. The 4010 metal cover is 4010-72MC. The 4020 metal cover is 4020-742 (note the slightly different numbering on the 4020 metal cover). The 4040 cover is 4040-72. The 4110 cover is 4110-72. This convention allows field technicians to identify the correct cover replacement without a catalog lookup if they know only the closer series number.

Regular Arm 3077: Which Series It Fits

The LCN regular arm 3077 is the standard arm shipped with most LCN surface-mounted closers. It works with the 1260, 1460, 4010, 4020, and 4040 (non-XP). It does not work with the 4040XP (different spindle shape), the 4110 (ships with EDA as standard and requires different arm geometry for parallel arm mounting), or any overhead concealed series. The 3077 is ordered with the series prefix: 4010-3077 for the 4010, 4020-3077 for the 4020, 4040-3077 for the 4040 (non-XP).

Fast Power Adjust: The Spring Adjustment That Prevents Cylinder Replacement

The 4010, 4020, 4030, and 4110 Series all include the Fast Power Adjust indicator system for spring power adjustment. This allows the spring power setting to be increased or decreased in the field without removing the cover or replacing the cylinder. When a 4010 or 4110 closer begins closing a door slowly or not latching reliably, the Fast Power Adjust should be the first intervention before any cylinder replacement is considered.

Most unnecessary cylinder replacements on 4010, 4020, and 4110 closers happen because the technician is not aware that the spring power is adjustable on these models. A closer with a spring power setting at size 1 on a heavy exterior door will not close reliably. Increasing the spring power to size 3 or 4 (appropriate for the door weight) restores reliable closing without any parts replacement. This takes two minutes with the correct allen key. A cylinder replacement for the same symptom takes 30 minutes and costs the cylinder assembly price.

LCN 4040XP: The Institutional Benchmark and Its Unique Features

The LCN 4040XP is identified in LCN's own catalog as the most durable and flexible heavy-duty closer designed for institutional and other demanding high-traffic applications. It is the reference product against which all other surface-mounted closer specifications are compared for institutional procurement.

What Makes the 4040XP Different from Other 4000 Series Models

The 4040XP's distinguishing features at the parts level are the cast iron body construction (versus the cast aluminum of the 4050A), the 1-1/2-inch piston diameter, the double heat-treated pinion journal, the six-sided hex spindle, the non-handed universal installation, and the all-weather Liquid X fluid that eliminates seasonal closing speed adjustment. The six-sided hex spindle on the XP accepts higher torque loads than the oval spindle on the 4010, 4020, and 4110, making it more resistant to spindle wear under the repeated high-cycle stress of institutional applications.

4040XP Arm Requirements: The Minimum Head Frame Clearance

The 4040XP requires a minimum top rail of 3-3/4 inches for standard installations. If the top rail is less than 3-3/4 inches, the plate 4040XP-18 is required. This plate is also required for parallel arm mounting where reveal is less than the specified minimum. The 4040XP auxiliary stop is recommended at the hold-open point or where the door cannot swing beyond 120 degrees. On doors mounted to pivot rather than butt hinges, the hinge width should not exceed 5 inches for correct XP arm function.

LCN 4050A: The Cast Aluminum Alternative and Its Specification Sweet Spot

The LCN 4050A serves the specification space between the 1000 Series light-to-medium duty closers and the 4040XP institutional standard. It is the correct specification for commercial building applications that require heavy-duty performance with a competitive price, but where the full institutional specification of the 4040XP is not required in the project scope.

4050A Construction vs 4040XP Construction

The 4050A uses cast aluminum for the outer cylinder body rather than the cast iron used in the 4040XP. Cast aluminum is lighter and less expensive than cast iron while providing adequate structural integrity for commercial (non-institutional) applications. The internal components of the 4050A match the 4040XP in piston diameter (1-1/2 inches) and pinion treatment (double heat-treated). The Liquid X all-weather fluid is also shared between the two series, eliminating seasonal adjustment on both.

The 4050A's standard mounting hole pattern (2-3/8 inches by 6-3/4 inches) is described by LCN as the most common commercial footprint, which means the 4050A can retrofit onto most commercial doors that previously had a 4000 Series or competitor closer without requiring new holes. This is one of the 4050A's underappreciated specification advantages for renovation work.

LCN 2210 Series: High-Security Overhead Concealed Closer for Correctional Environments

The LCN 2210 Series is the overhead concealed counterpart to the 4210/4510 Smoothee surface-mounted high-security closer. Where the Smoothee is visible on the door face but tamper-resistant, the 2210 provides complete concealment: the cylinder mounts in the head frame, and the arm and track mount in the top rail of the door. Nothing is visible from the door face in the closed position.

Why Complete Concealment Matters in Correctional Environments

In correctional facilities, psychiatric units, and juvenile detention environments, any hardware visible on the door face presents a potential leverage point. Surface-mounted door closers, regardless of their tamper resistance, provide a grasping surface and a mechanical anchor that motivated occupants can attack with improvised tools. The 2210's complete concealment eliminates this exposed hardware entirely. From the occupant's side of a door with a 2210 installed, the door appears to have no closer hardware at all.

2210 Series Key Specifications

The 2210 uses TORX tamper-resistant fasteners rather than standard Phillips or hex-head screws. Standard fastener tools carried by most people cannot drive TORX fasteners, creating a meaningful access barrier for impromptu disassembly attempts. The arm is forged steel with a heavy steel mounting plate engineered for high-abuse application loads. The single-lever arm and security track (non hold-open standard) are included with standard shipments.

The 2210 includes an optional door position switch (DPS) that signals a security or building automation system when the door is open or closed. This integrates the 2210 with correctional facility monitoring systems, providing real-time door status for every monitored opening. Standard cylinders are sized for interior doors to 4 feet 6 inches and exterior doors to 3 feet 6 inches. Handing must be specified (right or left swinging door) because the cylinder mounts in the head frame with a fixed orientation.

SRI Finish Option for Corrosive Environments

The 2210 is available with the LCN Special Rust Inhibiting (SRI) process for installations where the environment is potentially corrosive: laundry rooms in correctional facilities, coastal building locations, chemical storage areas, or any application where moisture and cleaning chemicals create above-normal corrosion risk. LCN's SRI process treats ferrous metal components with an inhibiting pretreatment before the powder coat is applied. The resulting finish exceeds the 100-hour salt spray protection level of standard LCN powder-coated finishes. This is not a standard option across the full LCN catalog and is specific to the high-security closer line.

Comparing the Full 4000 Series: Choosing the Right Model

What Fails First on LCN 4000 Series and 2210 Closers

Application-Specific 4000 Series (4010, 4020, 4110)

Spring power drift: Over years of high-cycle use, the spring power setting on the Fast Power Adjust system can drift downward, particularly on heavy exterior doors. The door begins closing more slowly and eventually fails to latch. Before diagnosing this as hydraulic fluid loss or cylinder failure, check and increase the Fast Power Adjust setting to confirm the spring power is at the correct level for the door weight.

Arm screw loosening: The 159 arm screw (1/4-20, 3/4-inch head diameter) holds the arm on the spindle across all 4000 Series models. High-cycle applications produce vibration that works the arm screw loose over time. A loose arm screw presents as a door that closes slowly or drifts open because the arm is spinning on the spindle instead of transmitting spring force to the door.

Fluid leak: A closer that closes too fast despite valve adjustment at the maximum restriction setting has lost hydraulic fluid. Fluid loss produces a loss of regulated closing control. Cylinder replacement is the correct service action. Additional valve adjustment on a dry cylinder produces no improvement.

4040XP

Parallel arm shoe wear: On parallel arm 4040XP installations, the shoe that connects the arm to the parallel bracket takes repeated mechanical load. The shoe connection can wear or the fasteners can loosen, producing a bouncy or unstable closing arc. Confirm the 4040XP-201 fifth hole spacer is present and the shoe fasteners are torqued correctly before diagnosing any other parallel arm complaint.

2210 Series

Track roller wear: The 2210 uses a track system (similar in concept to the 3130) where a roller travels in the track on every door cycle. Track roller wear is the primary maintenance item on the 2210. A 2210 installation that begins producing closing resistance or does not fully close despite correct spring sizing usually has a worn or seized track roller. Replacing the track roller restores correct operation without cylinder replacement.

Browse the LCN parts catalog at SecurityParts.com for all 4000 Series and 2210 components with interactive diagrams. For the full LCN door closer catalog including Sentronic, 1000 Series, and overhead concealed series, browse the commercial door closer parts catalog. For related exit device and electric strike parts on the same doors, browse exit device parts and electric strike parts. Pre-order support is at 845-935-0301 or the contact page.

Related Parts and Products at Security Parts

LCN 4000 Series closers appear on every commercial egress and fire-rated door alongside exit devices, electric strikes, and deadbolts. The 2210 appears on correctional facility doors alongside high-security cylindrical and mortise lock hardware.

For Von Duprin and Falcon exit device parts on egress doors with LCN 4040XP or 4050A closers, browse the exit devices catalog. For Von Duprin electric strike parts on access-controlled doors in the same building, browse the electric strikes catalogue. For Von Duprin Guard-X and Detex exit alarm parts on secondary exits, browse the exit alarms catalog. For Schlage ND and ALX Series cylindrical lock parts on secured interior doors, browse the cylindrical locks catalog. For Schlage L Series mortise lock parts on high-security entries in the same facility, browse the mortise locks catalog.

Browse the complete all products and parts catalog to source LCN, Von Duprin, Schlage, Falcon, and Detex hardware across the complete facility in a single session.

Security Parts carries Schlage padlocks including the 850410 covered laminate padlock, 855156 shackle-less padlock, 855101 Kryptonite vehicle hasp, 855118 high-security double hinge hasp, and 994800/994862 cable locks, plus Schlage installation tools including the 24002693 lever removal tool (ND and L Series), 021415 spanner wrench (D and L Series), 40-015 boring bit, 39-029 finish selector kit, and 40-029/40-030 strike marking chisels. Schlage padlocks use full-size Schlage cylinders that integrate directly into any Schlage masterkey system, allowing the building master key to open padlocks alongside all door hardware.

Schlage padlocks and portable security hardware solve the key management problem that undermines most commercial facility security programs: when a building uses Schlage door hardware on a masterkey system but standard padlocks on storage rooms, equipment cages, and utility closures, facilities staff carry two separate key sets. Schlage padlocks eliminate this by using the same full-size Schlage cylinder format that integrates into any building's existing Schlage key schedule. One key. All locks. Every door and every padlock.

The installation tools in the Schlage accessories catalog serve a different purpose: they are the precision instruments that determine whether field lock installation produces a door that operates correctly the first time or generates a callback. Strike misalignment, lever damage from improper removal, and bore errors are the three most common field-correctable installation failures, and the Schlage tool catalog addresses all three directly.

Browse the complete Schlage padlocks catalog and cylinders, keys and installation accessories catalog at Security Parts. For the full Schlage commercial hardware range, browse the Schlage commercial hardware catalog.

Schlage Padlocks: Why Full-Size Cylinders Matter

Most commercial padlocks use proprietary pin tumbler cylinders that are smaller than the cylinders used in commercial door hardware. This size difference is why standard padlocks cannot be incorporated into a building's Schlage masterkey system. The cylinder format must match between padlocks and door hardware for masterkey integration to work.

Schlage padlocks use the same full-size Schlage cylinder format used in the ND Series cylindrical locks, the L Series mortise locks, the B Series deadbolts, and the CL Series cabinet locks. Because the cylinder format is identical, Schlage padlocks can be: keyed to match any change key in the building's key schedule (one padlock key, one door key), keyed alike with other padlocks to use a single padlock key, masterkeyed so the building's master key opens both doors and padlocks, and grand masterkeyed within multi-building campus systems.

Schlage Padlock Product Guide

Shackle-Less Padlock + Double Hinge Hasp: The Highest Commercial Combination

Most commercial security consultants specify padlock security based on padlock grade alone, without considering the hasp as part of the attack surface. A Grade 1 padlock on a cheap single-hinge hasp can be defeated by prying the hasp open, bypassing the padlock entirely without cutting the shackle. The padlock is irrelevant if the hasp fails first.

The highest-security portable lock configuration available in the Schlage catalog at SecurityParts.com pairs the 855118 double hinge hasp with the 855156 shackle-less padlock. The hasp's double hinge eliminates the single-point prying attack. The shackle-less padlock eliminates the shackle cutting attack. When the 855156 bolt is engaged through the hasp staple, the only remaining attack surface is the hasp mounting screws (addressed by proper mounting into structural material with appropriate fasteners) and the padlock body itself (hardened steel resisting cutting and drilling).

Schlage Installation Tools and Accessories

Schlage installation tools exist because field installation of commercial door hardware is a precision operation. The difference between a correctly installed Schlage lock that operates smoothly for years and a callback-generating installation is frequently one measurement error on a strike location or one damaged lever from improper removal. The Schlage tool catalog at SecurityParts.com covers the tools that prevent these errors.

24002693: Lever Removal Tool for ND and L Series

The 24002693 lever removal tool is the correct instrument for removing levers from Schlage ND Series cylindrical locks and L Series mortise locks. The tool provides the correct geometry to release the lever retention tab without damage to the lever, rose, or chassis housing.

Schlage introduced an updated, more ergonomic version of this tool on August 15, 2012, alongside Phase 1 of the ND Series improvement project. The new tool (24002693) includes a bottle opener as an additional ergonomic feature and is the current production version. It works on all ND Series and L Series locks regardless of manufacture date.

021415: Spanner Wrench for D Series and L Series

The 021415 spanner wrench engages the spanner nut on Schlage D Series knobs and L Series mortise locks. The spanner nut is a cylindrical collar with notches cut around its perimeter, designed specifically to receive a spanner wrench rather than a conventional wrench.

This tool is required when disassembling cylinder housings, adjusting cylinder depth, or reassembling the lock body on D Series and L Series installations. Standard adjustable pliers or pipe wrenches can grip the spanner nut initially but quickly strip the notches, making future service impossible without the correct tool. Once the notches are stripped, the nut is difficult to remove without damaging the lock body, requiring housing replacement in many cases.

The 021415 replaced the older M504-341 spanner wrench. If a facility has older M504-341 tools in their kit, the 021415 is the current replacement that maintains the same function with the current ND and L Series spanner nut geometry.

39-029: Finish Selector Kit

The Schlage 39-029 finish selector kit is a collection of physical finish samples representing the full Schlage finish range. It is used at the specification stage of a project to select the correct finish designation before placing hardware orders.

Schlage finish codes use both BHMA designation numbers (626 for satin chrome, 619 for satin nickel, 622 for matte black, 605 for polished brass, and so on) and the older US designation system. Selecting a finish from a catalog image on a screen versus from an actual physical sample on the specified door material in the actual building lighting produces different results. The 39-029 finish selector kit provides physical sample chips that can be held against the door material in the actual installation environment, producing a finish selection that accounts for the actual ambient light rather than the catalog image.

40-015: Boring Bit 7/8 Inch

The Schlage 40-015 is a 7/8-inch diameter boring bit for the edge bore that accepts the latch assembly on cylindrical locks and deadbolts. The edge bore must be precisely sized to the latch body diameter: too small and the latch body cannot be inserted; too large and the latch body has excess play that causes misalignment and latch binding.

The standard 7/8-inch edge bore accommodates most standard Schlage latch assemblies. When a door's existing edge bore is the wrong size (too small for a new latch or damaged from a previous installation), the 40-015 restores the correct bore diameter. This bit is also used when installing Schlage hardware in doors that were previously bored for non-Schlage hardware with a different edge bore dimension.

40-026: Bushing for Jig 40-012

The Schlage 40-026 is a 1-1/2-inch bushing for the Schlage 40-012 installation jig. Installation jigs guide the boring bit to the correct position on the door face for the main crossbore without marking or measuring the door. The 40-026 bushing accepts the boring bit used for the 1-1/2-inch bore requirement on specific Schlage latch configurations.

40-029 and 40-030: Strike Marking Chisels

The 40-029 is a strike marking chisel for full-lip strikes. The 40-030 is a strike marking chisel for 1-1/8-inch by 2-3/4-inch strikes (the B Series deadbolt standard strike size). These are the most underused and most valuable installation tools in the Schlage accessory catalog.

A strike marking chisel is placed on the door edge with the lock's latch bolt in the extended position. When the door is closed against the chisel, the chisel face transfers an impression of the exact bolt position to the door frame. This impression shows the installer exactly where to chisel the mortise pocket in the frame for the strike. No measuring, no templating, no second-guessing the centerline. Strike misalignment is the most common cause of latch binding complaints on new installations, and it is also the most easily prevented with the correct marking tool.

Schlage Installation Tools and Accessories: Complete Reference

Key Envelopes and Key System Documentation

The Schlage 34-401 Home Secure Owner Key Envelopes (pack of 1000) are the physical documentation component of a Schlage key system management program. Each envelope provides a space to record key codes, cut specifications, key holder name, and key number for a single key.

Key system documentation is the most overlooked element of commercial lock hardware maintenance. A building whose key system records are complete can be rekeyed efficiently when a key is lost, can add new openings to the existing key schedule without conflict, and can demonstrate key control compliance during security audits. A building with no key records must be surveyed from scratch for every rekeying event, which multiplies the labor and materials cost of what would otherwise be a simple change key swap.

How to Integrate Schlage Padlocks into an Existing Key System

Integrating Schlage padlocks into an existing building key system follows the same process as adding any new Schlage lock to the system. Three steps determine how the padlock is keyed.

1. Identify the existing key system's keyway and master key schedule. The keyway must match between the padlock cylinder and the door hardware for the same key to operate both. If the building uses the Everest 29 keyway (restricted, patented), the padlock cylinder must also be specified as Everest 29. If the building uses a standard C keyway or other conventional keyway, the padlock cylinder is ordered to match.

2. Determine the keying level for the padlock. Should the padlock be operated by a change key (specific to one opening), masterkey (operates all locks at one master level), or grand master key (operates across multiple buildings or master groups)? The answer determines the pin tumbler combination used in the padlock cylinder.

3. Order the padlock with the cylinder specified to the key system requirements. Schlage padlocks can be ordered keyed to a specific Schlage key schedule when the order is placed through a Schlage distributor with access to the building's key bitting. For new buildings without an existing schedule, Schlage padlocks are ordered as part of the complete key system design.

Browse the complete Schlage padlocks catalog and installation tools and accessories catalog at Security Parts. For the complete Schlage commercial hardware range including B Series deadbolts, ND Series cylindrical locks, and L Series mortise locks, browse the Schlage commercial hardware catalog. Pre-order support is at 845-935-0301 or the contact page.

Related Parts and Products at Security Parts

Schlage padlocks and installation tools appear alongside all Schlage door hardware in commercial facilities. A complete building service call typically covers door locks, padlocks, and the tools needed to service both.

For Schlage ND Series and ALX Series cylindrical lock parts for interior office and corridor doors in the same facility, browse the cylindrical locks catalog. For Schlage L Series mortise lock parts for high-security entries, browse the mortise locks catalog. For Schlage B Series deadbolt parts for secondary exits and storage rooms, browse the deadbolts catalog. For Schlage CL Series cabinet lock parts for office furniture and filing cabinets in the same key system, browse the cabinet locks catalog. For LCN door closer parts on fire-rated corridor doors in the same building, browse the door closers catalog. For exit device parts on egress stairwells and fire exits, browse the exit devices catalog.

Browse the complete all products and parts catalog to source Schlage, Von Duprin, LCN, Falcon, and Detex hardware across the complete facility in a single session.

Security Parts carries parts for the LCN Sentronic fire and life safety closer series (3130SE, 4040SE, 4040SEH, 2310ME, 4310ME, 4410ME, 4310HSA, 4410HSA), the SEM 7800 Series magnetic holders, the 4210/4510 Smoothee high-security surface closers, and the Auto Equalizer pneumatic (2610, 4810, 4820, 4840) and electric (4630, 4640) operators. All Sentronic closers require voltage specification at ordering time (24V or 120V). The solenoid is not separately replaceable: it must be ordered as part of the track or cylinder subassembly. The SEH holder requires an opposite-side closer. SEH installation without a confirmed opposite-side closer is a life safety code violation on fire doors.

The LCN specialty product lines serve applications that standard surface closers cannot address: fire and smoke barrier doors that must hold open during normal hours and self-close on fire alarm, high-security environments where closer hardware must resist tampering, and multi-door corridors where a single pneumatic air supply powers dozens of doors simultaneously. Each of these product lines has unique parts requirements and ordering specifications that cannot be treated like standard surface-mounted closer parts.

Browse the complete LCN parts catalog at SecurityParts.com for all Sentronic, SEH, Smoothee, SEM 7800, and Auto Equalizer components. For the full LCN catalog including surface-mounted and overhead concealed closers, browse the commercial door closer parts catalog.

The LCN Sentronic System: How Fire Door Hold-Open Works

The LCN Sentronic system is built on a fundamental fire code requirement: interior fire and smoke barrier doors must be self-closing (they must close when not held open), but code allows them to be held open by an electromagnetic device connected to the building's fire alarm system. When the fire alarm activates, the current to the holding mechanism is interrupted and the door closes automatically under its own closer spring force.

This is the core operating principle of all Sentronic products. The door is held open during normal building hours by electromagnetic force. When fire alarm current interrupts, the electromagnetic hold releases and the door closer drives the door shut. No battery backup is involved: the fail-safe condition is always the de-energized state, which is the door closed. A power outage automatically closes all Sentronic-held doors, which is the correct life safety behavior.

LCN Sentronic Series Overview: Which Product for Which Door

Sentronic Parts Reference: Voltage Selection and Key Replacement Components

The Most Critical Ordering Decision: 24V or 120V

Every Sentronic closer cylinder and track assembly is voltage-specific. Ordering the wrong voltage produces a unit that connects to the wrong wiring system and either fails to hold open (if 120V unit on 24V supply) or potentially damages the control board (if 24V unit on 120V supply). The voltage of the installed system must be confirmed before ordering any Sentronic replacement component.

The installed voltage is determined by the building's fire alarm or hold-open control panel. In most modern commercial installations, 24V DC or 24V AC is the standard because fire alarm systems operate at 24V. In older buildings, 120V wiring from the building's electrical system was used because early Sentronic systems predated 24V fire alarm standardization. When replacing a component in an older building, confirm at the existing wiring rather than assuming the voltage from the building's era.

The Solenoid Subassembly Rule

The solenoid in all LCN Sentronic closers and holders is not a separately replaceable component. This is the single most important parts fact about Sentronic systems that is not documented in any supplier catalog in buyer-facing format. When a Sentronic closer fails to hold open (door closes immediately even with power applied), the diagnosis often points to the solenoid. The correct replacement is the track assembly or cylinder subassembly that includes the solenoid, not a standalone solenoid coil.

The 4040SE-3038 track assembly is the replacement unit that resolves solenoid failures on the 4040SE, 4040SEH, 3130SE, 4010SE, and 4110SE. It is ordered with voltage specification. No standalone solenoid replacement kit exists for these models. Ordering a solenoid coil separately, as some buyers attempt, produces a part that cannot be field-installed without the complete subassembly.

4310HSA and 4410HSA Sentronic: High-Traffic Passage Closers

The LCN 4310HSA and 4410HSA Sentronic Series occupies a different application niche from the fire door hold-open Sentronic products. Where the 4040SE, 3130SE, and 2310ME are fire-coded products for doors that must be kept closed during fire events, the 4310HSA and 4410HSA are electronically controlled closers designed for easy passage through high-traffic doors in normal building operations.

The 4310HSA and 4410HSA use an electronic hold-open function that allows staff or residents to pass through a door without fighting the closer spring force on every passage. A credential event, push-button signal, or occupancy sensor can trigger the hold-open, and the door closes automatically after the hold-open period expires. This is the correct specification for pharmacy pass-through doors in hospitals, resident wing corridor doors in assisted living, and high-traffic interior doors where physical effort is a barrier for specific user populations.

Both the 4310HSA and 4410HSA are surface mounted. The 4310HSA mounts on the hinge (pull) side. The 4410HSA mounts on the top jamb (push side). Parts for these series include voltage-specific cylinder assemblies and switch assemblies consistent with the broader Sentronic family.

LCN SEH Series Holder: The Critical Installation Requirement

The LCN SEH Series (including the 4040SEH) is a holder only device with no closing mechanism. This distinction is the most important life safety fact about the SEH Series and is responsible for more non-compliant fire door installations than any other LCN specification error.

SEH vs 4040SE: The Missing Closer

The 4040SE is a complete closer and holder in one unit. The 4040SEH is a holder only. When the fire alarm de-energizes the SEH's holding mechanism, the door must be closed by a separate door closer mounted on the opposite side of the door from the SEH. Without this opposite-side closer, the door hangs open when the SEH releases. A fire door assembly on a smoke or fire barrier that does not self-close is a non-compliant assembly and can result in the Authority Having Jurisdiction (AHJ) requiring immediate correction.

SEH Mounting and Configuration

The SEH Series mounts on the hinge pull side or stop face push side. The non-handed arm (SEH-3077T, standard single 100-degree holder arm) can be combined with any 4040SE series track, providing flexibility in mounting position. The track roller (SEH-3034) is the low-friction roller assembly with a 1/4-inch shoulder dimension X. The track slider (SEH-168) is the alloy metal slider used in SE series tracks.

LCN SEM 7800 Series Magnetic Holders

The LCN Sentronic SEM 7800 Series are electrically controlled door-holding magnets that are categorically different from Sentronic closers. The magnet holds the door open through direct magnetic attraction to a ferrous armature plate mounted on the door face. When the fire alarm de-energizes the magnet, the door releases and a separate door closer drives it shut.

SEM 7800 Mounting Options

The SEM 7800 Series offers three mounting configurations to address different door and corridor geometries:

Floor mount: The magnet mounts on the floor directly below the door edge. The armature plate mounts on the bottom of the door. Floor mounting is the cleanest aesthetic solution because the magnet is not visible on the wall or door face when the door is open.

Surface wall mount: The magnet mounts on the wall adjacent to the door. The armature plate is on the door face at the same height. Surface wall mounting is the easiest to install but leaves the magnet body visible on the wall.

Recessed wall mount: The magnet is recessed into the wall with only the face plate visible. This provides the lowest-profile wall appearance while maintaining the magnetic holding function.

LCN 4210 and 4510 Smoothee: High-Security Closer Parts

The LCN 4210 and 4510 Smoothee Series are the surface-mounted high-security door closers in the LCN catalog. They are specified in correctional facilities, detention centers, psychiatric hospitals, and juvenile facilities where occupants may have motive and opportunity to defeat or damage door hardware.

The "Smoothee" designation, which has been part of the LCN naming convention for decades, refers to the smooth, tamper-resistant exterior of the closer body. Standard door closers have exposed adjustment valves, arm screws, and cover seams that provide leverage points for tampering. The Smoothee's design minimizes these attack surfaces.

4210 vs 4510 vs 2210

The 4210 is the standard high-security Smoothee, heavy-duty surface mounted with special components to minimize tampering and vandalism. The 4510 is the heavy-duty high-security version for applications requiring maximum closer durability alongside the tamper-resistant design. The 2210 is the overhead concealed version of the high-security closer, for applications where a concealed installation is preferred but still require tamper resistance. All three are Grade 1 and available in finishes appropriate for institutional environments.

Smoothee Arm and Valve Access

The Smoothee Series uses a restricted cover design that limits access to the adjustment valves and arm screw without special tools. This is intentional: easy valve access is the primary tampering vulnerability on standard door closers in correctional environments. When servicing a Smoothee in the field, confirm the correct tool is available before beginning work. Attempting to access valves or covers with standard tools risks damaging the tamper-resistant features that make the Smoothee appropriate for its specification environment.

LCN Auto Equalizer Operators: Pneumatic and Electric

The LCN Auto Equalizer operator lines serve a specific application: doors that need to assist manual opening without being fully automatic door openers. Where the Benchmark and Senior Swing operators open doors automatically when activated, the Auto Equalizer provides reduced opening force assistance using pneumatic or electric power. The result is a door that feels lighter to open without being power-operated in the sense that requires ADA guard rails or safety mats.

Pneumatic Auto Equalizer: 2610, 4810, 4820, 4840

The pneumatic Auto Equalizer series uses compressed air to equalize the door opening force. The 2610 is the most distinctive model: a single air supply unit that can power multiple doors simultaneously through pneumatic distribution lines. This multi-door capability makes the 2610 appropriate for large corridor projects where installing individual operators on each door would be prohibitively expensive.

The 4810 is the pneumatic series for primarily manual applications where occasional automatic assistance is needed. The 4820 is the low-energy ADA version providing controlled opening for accessible routes. The 4840 is the pneumatic multi-door solution for simultaneous control of several doors from a single air supply.

Electric Auto Equalizer: 4630 and 4640

The 4630 and 4640 use an electrohydraulic mechanism (motor-driven hydraulic pump) rather than compressed air. The 4630 allows manual opening to 170 degrees. The 4640 allows manual opening to 100 degrees.

Both the 4630 and 4640 are designed for doors up to 225 pounds and act as standard door closers in the event of power outage, maintaining the fail-safe closed behavior required on fire-rated egress doors. The 4630 and 4640 use a controller assembly (part 4640-3462 for the 4640) that manages the hydraulic operation and includes an on/off switch and hold-open adjustment.

For reveal depths between 4-1/2 inches and 8 inches, the 4630 requires the 4642 long arm. For reveal depths greater than 8 inches, consult the factory before ordering. This arm specification is distinct from all surface-mounted LCN closer arms and must be confirmed against the specific door reveal before any arm replacement order.

How to Identify the Correct Sentronic or Specialty Closer Before Ordering

Five pieces of information are needed before any Sentronic or specialty LCN parts order.

1. Series designation (4040SE, 4040SEH, 4310ME, 4410ME, 2310ME, 3130SE): On the label under the cover or on the cylinder body. This determines the parts catalog section.

2. Voltage (24V or 120V): At the wiring junction box or on the existing transformer. Voltage-specific components will not function if the wrong voltage is ordered.

3. Which component failed (track assembly, on/off switch, transformer, roller, slider): Track assembly failures: door does not hold even with power confirmed. Switch assembly failures: hold-open function cannot be tested or interrupted from the local switch. Roller failures: track noise or resistance on door swing.

4. For SEH: confirm opposite-side closer is present and UL-listed. Any SEH parts order should include verification that the opposite-side closer is still functional and compliant before the SEH is serviced.

5. For Smoothee: confirm available service tools before scheduling field work. The Smoothee's tamper-resistant design requires specific tools that may not be on a standard service truck.

Browse the LCN parts catalog at SecurityParts.com for all Sentronic, SEH, Smoothee, SEM 7800, and Auto Equalizer components. For the full LCN closer catalog including surface-mounted and concealed series, browse the commercial door closer parts catalog. For related exit device and alarm parts that appear on the same fire doors, browse exit alarm parts and exit device parts. Pre-order support is at 845-935-0301 or the contact page.

Related Parts and Products at Security Parts

Fire and smoke barrier doors that use LCN Sentronic or SEH holders also typically include exit devices, electric strikes for access-controlled fire door openings, and exit alarms on secondary egress doors.

For Von Duprin and Falcon exit device parts on fire-rated egress doors in the same building, browse the exit devices catalog. For Von Duprin Guard-X and Detex ECL exit alarm parts on fire door secondary exits, browse the exit alarms catalog. For Von Duprin electric strike parts on fire door frames with access control, browse the electric strikes catalog. For Schlage ND and ALX Series cylindrical lock parts on office and interior doors in the same facility, browse the cylindrical locks catalog. For Schlage L Series mortise lock parts on high-security entries in the same building, browse the mortise locks catalog.

Browse the complete all products and parts catalog to source LCN, Von Duprin, Schlage, Falcon, and Detex hardware across the complete facility in a single session.

Security Parts carries parts for the LCN 1000 Series surface-mounted closers (1260 and 1460) and the overhead concealed series including 2010/5010, 2030/5030/6030 Pacer, and 3030/3130. The 1000 Series are universal closers: both the 1260 and 1460 fit left and right hand doors without specifying handing. The arm screw 159 (1/4-20, 3/4-inch head) holds the arm to the spindle across all major LCN surface-mounted series. The regular arm 3077 works on 1260, 1460, 4010, 4020, and 4040 closers. Arms are not cross-compatible between the 1000 Series and the 4040XP. Cover part numbers follow the convention: series number followed by -72 (for example, 1460-72 for the 1460 cover). All overhead concealed series use cast iron cylinders and forged steel pistons with all-weather fluid.

The LCN product catalog covers considerably more than just the 4040XP. The 1000 Series surface-mounted closers are on more light commercial, educational, and healthcare interior doors than any other LCN surface-mounted line. The overhead concealed series: 2010, 5010, 2030, 5030, 6030, 3030, and 3130, cover institutional, aluminum storefront, and interior door applications where a visible surface-mounted closer is not acceptable architecturally. Each series uses different parts that are not cross-compatible with other series even within the same LCN catalog.

Browse the complete LCN parts catalog at SecurityParts.com. For the full LCN door closer and automatic operator catalog, browse the commercial door closer parts catalog.

Surface Mounted vs Overhead Concealed: Choosing the Right LCN Series

Every LCN door closer falls into one of two fundamental categories: surface mounted (the closer body is visible on the door face or header) or overhead concealed (the closer mechanism is hidden inside the door, frame, or transom). The choice between them is driven by the application, the architectural requirement, and the door construction. Parts are never cross-compatible between the two categories.

Surface mounted closers are faster to install, easier to service, and carry lower installed cost. The closer body, arm, and cover are all visible on the door face. The 1000 Series (1260 and 1460) and the 4000 Series (4040XP, 4040, 4000) are both surface-mounted. They are the correct choice for any commercial door where concealment is not required.

Overhead concealed closers hide the mechanism inside the door or frame, leaving only the arm or track visible or nothing visible at all when the door is closed. They are specified on high-end architectural projects, historic renovations where exposed hardware is not acceptable, healthcare corridors where cleaning staff cannot trap dirt behind visible closer bodies, and aluminum storefront doors where the closer must fit within the narrow tube frame. The 2010, 5010, 2030, 5030, 6030, 3030, and 3130 Series are all overhead concealed.

LCN 1000 Series Surface Closers: 1260 and 1460

The LCN 1000 Series contains LCN's most versatile surface-mounted closers. All standard 1000 Series models are universal: they install on either hand of door and in regular arm, parallel arm, or top jamb configurations without specifying handing at order time. This universality is the primary specification advantage over the 4000 Series (which requires handing specification on most models) and is why the 1000 Series appears so frequently on quick-turn projects and retrofit applications.

LCN 1000 Series Parts Reference

The LCN Cover Part Number Convention: Series + -72

The LCN plastic cover part number follows a consistent convention across all surface-mounted series: the model series number followed by -72. The 1460 cover is 1460-72. The 4040 cover is 4040-72. The 4020 cover is 4020-72. The 4110 cover is 4110-72. This convention applies across all standard surface-mounted LCN series and eliminates the need to look up the cover part number separately when you know the closer series. Not all LCN closers have the same shape cover, so even though the naming convention is consistent, the physical cover is series-specific and cannot be substituted between series.

The Green Dial Spring Adjustment on the 1460

The LCN 1460 Series features the patented Green Dial spring power adjustment system. Unlike older LCN closer designs where spring power adjustment required the correct-size stamped cylinder from the factory, the Green Dial allows field adjustment of spring power from size 1 through size 6 without requiring a different cylinder. Turning the Green Dial clockwise increases spring power (heavier closing force). Counterclockwise decreases it. This field adjustment eliminates the need to order a replacement cylinder when the spring power setting needs to change after installation, for example when a door adds a gasket that increases resistance and needs more closing force to latch reliably.

Arm Cross-Compatibility: What Works Where

LCN closer arms are machined to the specific spindle dimensions of each closer series. The spindle size and shape differs across models. The spindle on the 1260 and 1460 is different from the spindle on the 4040XP. An arm ordered for the 1460 Series will not fit a 4040XP closer. The 3077 regular arm works on the 1260, 1460, 4010, 4020, and 4040 (non-XP) closers. It does not work on the 4040XP, 4110, 4040SE, or any overhead concealed series.

LCN 2010 and 5010 Series: Heavy-Duty Overhead Concealed for Institutional Applications

The LCN 2010 and 5010 Series are the heaviest-duty overhead concealed closers in the LCN catalog, specifically designed for institutional, high-traffic applications where complete concealment and maximum durability are both required. Hospitals, government buildings, correctional facilities, and university buildings with high daily cycle counts and abuse resistance requirements are the typical 2010/5010 specification environments.

2010 Series: Concealed in Frame and Door

The 2010 Series conceals both the cylinder in the door frame and the track in the door. From the finished side, the door shows only a clean face with no visible hardware at all when the door is in the closed position. This complete visual concealment is the defining specification feature of the 2010 and is why it is used in high-end institutional applications where exposed hardware is not acceptable.

The 2010 requires a mortise pocket in the door for the track and a mortise pocket in the frame for the cylinder. This door preparation requirement means the 2010 must be specified during door manufacturing, not retrofitted to standard doors without significant field work.

5010 Series: Cylinder Concealed in Frame, Double-Lever Arm Exposed

The 5010 shares the 2010's cylinder concealed in the door frame but uses an exposed double-lever arm on the door face rather than a concealed track. The exposed arm makes field service considerably easier: the arm is accessible without removing the door from the frame. The 5010 is the correct choice when concealment of the cylinder is required for security reasons (as in correctional applications where an exposed closer body could be defeated) but a fully concealed track is not required by the specification.

Both the 2010 and 5010 meet ANSI/BHMA A156.4 Grade 1 and ADA reduced opening force requirements. Both are designed for aluminum, hollow metal, or wood doors and frames and can be used with hinge or pivot mounted doors.

LCN 2030, 5030, and 6030 Pacer Series: Overhead Concealed for Aluminum Transoms

The LCN Pacer 2030/5030/6030 Series is the overhead concealed closer solution for narrow aluminum transom frames. The minimum transom width for Pacer concealment is 1-3/4 inches: the same minimum stile width that defines aluminum storefront hardware throughout the commercial door hardware industry. This is not coincidental. The Pacer was engineered to fit inside standard aluminum storefront frame sections, which is why it is the standard specification for overhead concealed closers on aluminum commercial entries.

2030, 5030, and 6030 Differences

The 5030 Series arm joints and shoe adapt to uneven trim, making it the preferred choice on aluminum storefront installations where the frame alignment is not perfectly consistent. On a standard aluminum door with a precisely manufactured frame, the 2030 concealed track arm is typically preferred for aesthetic reasons. On doors where field conditions introduce uneven trim, the 5030's adaptive arm joints accommodate the variance.

Pacer Series Construction

All three Pacer series use the same internal construction: a cast iron cylinder, a one-piece forged steel piston, a high-efficiency full-complement low-friction bearing, tamper-resistant regulating screws, and all-weather fluid. The spring power and latch speed adjustments are independent for either swing direction on all three series. The backcheck and general speed adjustments are common for both swings. All three are UL and cUL listed for self-closing doors without hold-open and carry a 15-year limited warranty.

LCN 3030 and 3130 Series: Overhead Concealed for Interior Doors

The LCN 3030 and 3130 Series are overhead concealed closers specifically designed for interior doors in medium- to high-traffic areas, mounted within the standard 1-3/4 inch interior door thickness. Where the 2030/5030/6030 Pacer fits in aluminum transom frames, the 3030/3130 fits within the door itself.

3030 vs 3130: Arm Style and Concealment Level

The 3030 Series conceals the cylinder in the door but uses an exposed double-lever arm on the door face. The arm joints adapt to uneven trim. The 3030 uses a non-handed cylinder, simplifying parts ordering when handing is uncertain.

The 3130 Series achieves complete concealment with both the cylinder in the door and a single-lever arm connected to a track and roller assembly that is also concealed within the door when the door is in the closed position. The only visible component on a 3130 installation is the roller in the track, and this is visible only when the door is open. From the closed-door view, there is no visible hardware at all. The 3130 uses a handed cylinder (right hand or left hand must be specified at ordering time).

3130 Track Roller: The Critical Wear Component

The 3130 track roller assembly is the most frequently replaced component on the 3130 Series. The roller travels in the track on every door cycle and wears over years of use. The standard track roller is part 3130-3034 (standard closing, aluminum finish). The hold-open track roller is part 3130-3034H (allows the door to hold open at a specified angle). When the door begins to not close fully or drifts open from a previously reliable closing cycle, the track roller is the first replacement candidate before diagnosing the cylinder.

3030 and 3130 Sizing

Both the 3030 and 3130 are sized closers, meaning the cylinder size must be specified at order time rather than being field-adjusted like the 1460's Green Dial system. The size number refers to the spring power, which determines the door width the closer can control. The 3130 size designation uses a single digit suffix: 3131 is size 1, 3132 is size 2, 3133 is size 3. Size 3 covers interior doors to 3 feet 2 inches. For a door wider than 3 feet 2 inches, a larger size must be specified at the time of ordering. Getting the size wrong means returning the closer for the correct size cylinder.

Overhead Concealed Closer Comparison: Which Series for Which Application

What Fails First on These LCN Closers

Surface Mounted 1000 Series

Arm screw 159: The most common service item on any 1000 Series installation. As the closer cycles thousands of times, the vibration from the arm's operating forces loosens the arm screw. When loose, the arm spins on the spindle instead of transmitting spring force to the door. The door then either fails to close fully or slams shut. Checking and retorquing the arm screw as a maintenance item eliminates most 1000 Series service calls.

Cover damage: The 1000 Series plastic cover takes environmental and cleaning chemical exposure that cracks or discolors the cover over time. The cover (part 1260-72 or 1460-72) is a cosmetic replacement that requires no tool beyond a standard screwdriver. Always confirm the series before ordering the cover replacement.

Fluid leak: A surface-mounted LCN closer that is closing too fast and slamming despite adjustment attempts has almost certainly lost hydraulic fluid. Fluid loss makes the valve regulation system ineffective. A replacement cylinder assembly is the correct part, not additional valve adjustment. Continued adjustment on a leaking cylinder body does not restore controlled closing speed.

Overhead Concealed Series

3130 track roller: Progressive wear over high-cycle use. Symptom: door that previously closed correctly now drifts open or does not fully close. Replace the track roller before diagnosing the cylinder.

2030/5030 roller assembly: The roller assembly in the Pacer series is the interface between the arm and the door. It can seize or develop play from aluminum oxide contamination on aluminum door surfaces. Annual lubrication of the roller assembly with a dry-film or silicone-based lubricant prevents most premature roller failures on 2030/5030 installations.

Arm joints on 5030 and 3030: The adaptive arm joints on the 5030 and 3030 contain a socket-and-ball mechanism that allows the arm to accommodate uneven trim. These joints can wear or corrode, losing the flexibility range that makes the adaptation possible. A 5030 or 3030 installation that begins to bind or produce door closing resistance despite correct cylinder adjustment usually has worn arm joints requiring arm replacement.

Browse the complete LCN parts catalog at SecurityParts.com for all 1000 Series, 2010/5010, 2030/5030/6030, and 3030/3130 components. For the full LCN door closer catalog including the 4040XP, Sentronic, and Smoothee series, browse the commercial door closer parts catalog. Pre-order support is at 845-935-0301 or the contact page.

Related Parts and Products at Security Parts

LCN door closers appear on every fire-rated egress door alongside exit devices and electric strikes. The same building that uses 1460 Series surface closers on office doors uses 2030 Pacer closers on aluminum storefront entries and 3130 concealed closers on high-end architectural interior doors.

For Von Duprin and Falcon exit device parts on egress doors in the same building, browse the exit devices catalog. For Von Duprin electric strike parts on controlled entry doors in the same facility, browse the electric strikes catalog. For Von Duprin complete exit device and alarm parts, browse the Von Duprin catalog. For Schlage ND and ALX Series cylindrical lock parts on secured interior doors in the same building, browse the cylindrical locks catalog. For Schlage L Series mortise lock parts on high-security entries in the same facility, browse the mortise locks catalog.

Browse the complete all products and parts catalog to source LCN, Schlage, Von Duprin, Falcon, and Detex hardware across the complete facility in a single session.

Security Parts carries parts for the Von Duprin 75 and 78 Series pushpad devices (70 Series family), the 88 Series wide stile crossbar, the 94/95 INPACT recessed push pad series, and the 54 Series mullion line. The 75 is narrow stile; the 78 is wide stile. Both share the 70 Series QEL quiet electric latch option. The 88 Series crossbar tube (part 967738) is 42 inches and shared with the 55 Series, field-cut to size. The 88 lever arm is handed (050438 RH, 050439 LH); the dogging pin spring in the arm is a separate replaceable component. The INPACT 94/95 is a recessed push pad device for impact reduction. Mullion stabilizers (part 154) must be installed on every mullion to prevent security bypass via deflection.

Von Duprin's exit device catalog is broader than most facilities managers realize. Beyond the 98/99, 33A/35A, 22, and 55 Series covered elsewhere, there are four additional series that address specific application challenges: the 70 Series (75 narrow stile and 78 wide stile pushpad devices), the 88 Series (wide stile crossbar), the 94/95 INPACT Series (recessed push pad for impact-prone environments), and the 54 Series mullion line that enables rim devices on double-door openings.

Browse the complete Von Duprin parts catalog at SecurityParts.com for all series with interactive diagrams. For the full exit device catalog including Falcon alongside Von Duprin, browse the commercial exit devices catalog.

Von Duprin 70 Series: The 75 and 78 Pushpad Family

The Von Duprin 70 Series is the most recent generation of the Von Duprin pushpad exit device family, covering the 75 (narrow stile) and 78 (wide stile) models. These are positioned between the economy 22 Series and the premium 98/99 Series, offering heavy-duty construction for warehouse, industrial, office, multifamily, retail, and commercial real estate applications where the highest specification of the 98/99 is not required.

70 Series Quiet Electric Latch Retraction (QEL)

The QEL option is the most important specification detail on the 70 Series (75 and 78) and 94/95 INPACT Series. Standard electric latch retraction (EL) on Von Duprin devices uses a solenoid that produces a distinct mechanical click when the latch retracts. In healthcare corridors, educational facilities, and quiet institutional environments, this noise is a complaint trigger from clinical staff and building management.

The Quiet Electric Latch Retraction (QEL) addresses this by using a motorized, slower-action latch retraction mechanism that significantly reduces the noise of electric latch operation. The QEL is available on devices sold after October 2014 on new installations. For pre-October 2014 devices, modular conversion kits allow upgrading existing non-EL panic or fire-rated devices to QEL without replacing the entire exit device.

70 Series Electronic Options

The 70 Series (75 and 78) supports the following electronic options. These are specified at ordering time and are not field-added without conversion kits.

Von Duprin 88 Series: Wide Stile Crossbar Parts

The Von Duprin 88 Series is a wide stile crossbar exit device for standard commercial hollow metal and wood doors. Where the 55 Series is the narrow stile crossbar for aluminum storefronts, the 88 is the wide stile crossbar for doors with 4-1/2 inches or more of stile width. The 88 Series has been in production since at least the 1950s and remains in the Von Duprin catalog because it serves two applications that pushpad devices cannot: traditional-looking wide stile installations where the crossbar aesthetic is an architectural requirement, and non-standard door widths where the field-cuttable crossbar can be sized precisely without special ordering.

88 Series Crossbar Tube: Part 967738

The Von Duprin 88 and 55 Series share the same crossbar tube (part 967738). The tube is 1 inch in diameter and 42 inches long. It ships at 42 inches and must be field-cut to the appropriate length for the specific door width using a tubing cutter or hacksaw. One side of the tube comes pre-cut with a slot for the wedge tite screw opening. This pre-cut slot must be positioned correctly when the crossbar is installed in the lever arm.

Tube Attaching Ring and Wedge Tite Screw

The tube attaching ring (part 090021) fits over each lever arm and is expanded by the wedge (part 88R90) and the wedge tite screw (part 88R100) to clamp the crossbar securely to the arm. The ring measures 15/16 inch long by 13/16 inch diameter. When tightened, the ring expands and holds the crossbar parallel to the door without visible fasteners on the front face of the bar.

A rattling crossbar or a crossbar that has dropped at one or both ends is almost always caused by loose wedge tite screws, not by failed components. The correct service is to tighten the wedge tite screw in each lever arm with a drop of blue thread-locker applied before final tightening. Thread-locker prevents vibration-induced loosening on high-cycle doors without making the screw impossible to remove for future service.

88 Series Lever Arm Assemblies

The 88 Series lever arm connects the crossbar to the center case mechanism. The lever arm is handed: right hand is part 050438, left hand is part 050439. Each arm includes the wedge, wedge ring, wedge tite screw, and dog screw. Some kits also include the axle.

Lever arm replacement is needed when the dogging screw in the arm has stripped (the most common failure reason according to field service records), when the arm is physically bent from impact, or when the axle has failed. The axle is a separately replaceable component: the current axle design (introduced around 1990) snaps together and replaces the older design that used allen-wrench-assembled axles. When replacing an axle, the separation tool is required to disassemble the current snap-together style.

The 88 Series Dogging Pin: The Failure Nobody Diagnoses

The Von Duprin 88 Series uses a dogging pin mechanism located on the underside of the active lever arm to hold the crossbar in the depressed position during business hours. This is different from the hex key slot used on the 22, 33A, and 98/99 Series. The dogging pin has an internal spring that provides the retention force.

88 Series Field-Reversible Handing

The 88 Series is field-reversible for handing. This means the device can be converted from right-hand to left-hand or vice versa in the field without returning the device for a factory conversion. This saves the project when door handing has been incorrectly specified: a Friday afternoon discovery that the device is the wrong hand can be corrected on-site rather than requiring a return and reorder. Confirm handing before installation regardless, but this reversibility is a genuine specification advantage over devices requiring factory handing.

88 Series Mounting Screw Package

The 88 Series mounting screw package (part 900503) includes 12 screws in two types: 6 machine screws and 6 hybrid screws (for the 88C/C or E/C mounting configurations). Always use the correct screw type for the specific mounting configuration. Using only machine screws on a hybrid mounting leaves the device with reduced pull-out resistance at the center case anchor points.

Von Duprin 94/95 INPACT Series: Recessed Push Pad Parts

The Von Duprin INPACT 94/95 Series is the only fully recessed exit device in the Von Duprin commercial line. Instead of a push pad that projects outward from the door face, the INPACT push pad sits within a routed recess in the door so the pad face is flush with or set back slightly from the door surface. From a distance, the device appears to be part of the door panel rather than hardware mounted to it.

Why the Recessed Design Exists

The recessed design solves a specific problem in high-traffic environments where equipment regularly passes through doorways: medical facilities with gurney traffic, emergency departments with IV pole carts, warehouses with pallet jacks. On these doors, a projecting push pad takes repeated equipment impact that bends the pad, loosens the mechanism case, and damages the door itself over time. The INPACT's recessed pad eliminates the protrusion that equipment contacts, extending the device's service life dramatically on impact-prone doors.

94 vs 95 Series

The 94 Series has a grooved push pad surface. The 95 Series has a smooth push pad surface. Both are mechanically and dimensionally identical. All internal parts are shared between 94 and 95. The choice between them is purely aesthetic and is made at specification time based on building design preference. When ordering replacement parts for either series, the part numbers are the same.

INPACT Door Preparation Requirements

The INPACT 94/95 requires a routed recess in the door face for the mechanism case. This prep is built into the door during manufacturing. Steelcraft hollow metal doors are specifically listed as compatible with the standard INPACT door prep. If an INPACT device must be installed on a door that was not prepped at manufacturing, the door must be routed in the field to the INPACT specification, which requires a different site operation than standard exit device installation.

INPACT Electronic Options

The INPACT 94/95 Series supports Quiet Electric Latch Retraction (QEL) and field-reversible handing. The QEL option makes the INPACT particularly well-suited to healthcare corridor applications where both impact protection (recessed pad) and quiet electric latch operation are specified simultaneously. These two features together address the two most common exit device complaints in healthcare: equipment impact damage and latch noise in patient care areas.

Von Duprin 54 Series Mullions: Parts and Critical Security Considerations

A mullion is a vertical structural member that mounts between the two leaves of a double-door opening to provide a fixed strike-receiving element for rim exit devices. Without a mullion on a double-door opening, a rim exit device has no fixed jamb to mount a strike to. The rim latch would have no receptacle, and the door pair could not latch.

Why Mullions Matter for Fire Door Code Compliance

On fire-rated double-door openings, the code governing whether a rim exit device is permitted or a concealed vertical rod device is required turns on whether a mullion is present. A rim exit device on a fire-rated pair without a mullion is a non-compliant installation: the rim strike mounts to the active door leaf, which is not a fixed structure and cannot provide the fire-resistive separation required by the door assembly listing. With a fixed or removable mullion providing a fixed strike location, rim exit devices are permitted on most fire-rated pairs. Without a mullion, concealed vertical rod devices are required.

54 Series Mullion Types

Mullion Fittings and Covers

The top fitting and cover (part 050135) and the bottom fitting (part 050190) are the end cap assemblies for the 5654 and 5754 mullions. The fitting set (part 050130) includes both top and bottom fittings with all mounting screws. When a mullion fitting is damaged from impact or the fasteners have stripped, the fitting is a separately replaceable component. Always confirm whether the damage is to the fitting only or to the mullion tube body itself before ordering, as these are different parts.

Mullion Stabilizer: The Security Component Nobody Installs

The Von Duprin 154 mullion stabilizer package is included in the box when the 5654 aluminum mullion is purchased. It is the most overlooked component on every mullion installation.

The stabilizer prevents lateral deflection of the mullion under door abuse and impact loading. When a mullion deflects sideways from someone pushing or shaking a door hard, the deflection moves the strike out of alignment with the rim latch on both door leaves simultaneously. This causes both exit devices to release, effectively opening the entire double-door opening without any key, credential, or authorized access event. The 154 stabilizer braces the mullion against the door frame, preventing this deflection and maintaining strike alignment under impact.

Weather Stripping for Mullions

The Von Duprin weather stripping (part 050580) is specific to the 5654 and 5754 mullions. Each strip is 10 feet long. Two strips are required per mullion (one on each side of the mullion facing the door leaves). This is an often-omitted component on interior mullion installations but a required component on exterior door applications where the mullion must provide an air and weather seal against the door leaves.

How to Identify the Correct Series and Parts

Five questions determine the correct parts before any order for these series.

1. Is this a pushpad, crossbar, or recessed device? Crossbar spanning the door width = 88 Series (or 55 if narrow stile). Recessed pad flush with door face = 94/95 INPACT. Projecting rectangular pushpad = 75 or 78 Series (or 22, 33A, 98/99 from other series). If in doubt, check the label on the mechanism case.

2. Is the door stile narrow or wide? Narrow stile aluminum storefront = 75 Series (pushpad) or 55 Series (crossbar). Wide stile hollow metal or wood = 78 Series (pushpad) or 88 Series (crossbar). The 88 requires a minimum 4-1/2 inch stile.

3. For mullion parts: is the mullion fixed or removable? A mullion with no visible release mechanism is fixed (5654 or 5754). A mullion with a cylinder or lever release is removable (1654 or 4954). Removable mullions use different fittings from fixed mullions.

4. For 88 Series crossbar parts: is the failure the crossbar tube, the lever arm, or the dogging pin spring? Rattling or dropped crossbar = wedge tite screw loose, no parts needed. Stripped dogging in arm = dogging pin spring first, lever arm assembly only if spring replacement fails. Bent or broken arm body = lever arm assembly replacement (050438 RH or 050439 LH).

5. For INPACT parts: confirm the trim series is 94/95-specific. INPACT trim (940, 550 for INPACT, 376) is not interchangeable with standard Von Duprin trim. Ordering standard trim for an INPACT installation produces parts that physically will not seat in the recessed door prep geometry.

Browse the Von Duprin parts catalog at SecurityParts.com for 75, 78, 88, 94/95 INPACT, and 54 Series mullion components with interactive diagrams. For the full exit device catalog including Falcon exit devices, browse the commercial exit devices catalog. For Von Duprin electric strike parts, browse the electric strikes catalog. Pre-order support is at 845-935-0301 or the contact page.

Related Parts and Products at Security Parts

Von Duprin 75, 78, 88, and INPACT exit devices appear on the same doors as electric strikes, door closers, and cylindrical locks. Mullions appear on double-door openings that also typically include one of these exit device series.

For Von Duprin electric strike parts on 75, 78, 88, or INPACT rim device installations with controlled entry, browse the electric strikes catalog. For exit alarm parts including Von Duprin Guard-X and Detex ECL and EAX for secondary exit monitoring, browse the exit alarms catalog. For LCN door closer parts on fire-rated egress doors in the same building, browse the door closers catalog. For Schlage ND and ALX Series cylindrical lock parts on interior doors in the same facility, browse the cylindrical locks catalog. For Falcon 19, 24, and 25 Series exit device parts as an alternative brand on newer construction egress doors in the same building, browse the Falcon hardware catalog.

Browse the complete all products and parts catalog to source Von Duprin, Schlage, LCN, Falcon, and Detex hardware across the complete facility in a single session.

Security Parts carries parts for the Von Duprin 22, 33A/35A, and 55 Series exit devices. The 22 Series is the economy wide stile device for medium-to-low traffic with a 3-13/16 inch minimum stile. The 33A/35A is the narrow stile pushpad device with a fluid dampener, deadlocking latch, and concealed VR configurations for stiles as narrow as 2-1/8 inches. The 55 Series is the traditional crossbar device for aluminum storefront doors with stiles as narrow as 1-3/4 inches. Key shared parts: the dogging shaft and adapter work across 22, 33A, 98, and 99 Series. The 33A/35A ALK alarm kit is compatible with 22, 33A, 35A, 98, and 99 Series. The 55 Series uses dedicated narrow stile trim that is not interchangeable with any other Von Duprin series.

Von Duprin invented the first self-releasing fire exit device over a century ago. The 22, 33A/35A, and 55 Series represent three distinct product lines that together cover the majority of commercial egress doors installed in North America from the 1970s through today. When one of these devices needs a replacement part, the most critical first step is confirming which series is installed. Parts from the 33A/35A will not work on the 22. Parts from the 55 will not work on either. Trim from the 98/99 will not fit the 55. Getting the series wrong generates a return.

Browse the complete Von Duprin parts catalog at SecurityParts.com for 22, 33A/35A, 55, and all other Von Duprin series with interactive diagrams. For the full exit device catalog including Falcon exit devices alongside Von Duprin, browse the commercial exit device parts catalog.

Three Series, Three Applications: How to Choose and Why It Matters for Parts

Von Duprin 22 Series Parts

The 22 Series is the value-line option in the Von Duprin exit device catalog. It is not a light-duty device: it carries the same ANSI A156.3 Grade 1 certification as the 33A/35A and 98/99 Series and is UL listed for both panic and fire hardware. What distinguishes it from the 33A/35A is the absence of a fluid dampener and deadlocking latch, a narrower trim compatibility range, and no concealed VR configuration. For doors where these features are not required, the 22 Series provides genuine Von Duprin Grade 1 quality at a more economical price point.

22 Series Center Case

The center case is the core mechanism housing that contains the latch bolt and push bar actuating mechanism. The 22 rim device center case and the 2227 surface vertical rod center case are different parts and not interchangeable. The 2227 (SVR version) has a separate center case because it must accommodate the rod actuating mechanism in addition to the latch bolt. When ordering a replacement center case, always confirm whether the installed device is a 22 rim (single latch point) or 2227 SVR (two-point latching with top and bottom rods).

22 Series Dogging Cover Plates

The dogging cover plate covers the dogging assembly on the hinge side of the exit device. It is a frequently lost or damaged component. On 3-foot devices, the cover plate part number is 968595 (10-3/4 inches long). On 4-foot devices, the cover plate is 968596 (16-3/4 inches long). These cover plates are device-length specific. Installing a 3-foot cover plate on a 4-foot device leaves the dogging assembly exposed and vulnerable to damage and debris accumulation.

22 Series End Cap and 2227 Rod Guide Assembly

The end cap covers the hinge-side end of the mechanism channel. The 22 Series uses the 050014 impact-resistant end cap kit (shared with 33A/35A and 98/99 Series) which replaces all previous end cap versions. This cross-series compatibility is one of the few shared parts between the 22 and 33A/35A families.

The 2227 rod guide assembly 112063 replaces the older style SVR rod guide that used a plastic cap and springs. The new rod guide adds strength and rigidity to the top and bottom rods on the surface VR version. If the rods on a 2227 installation show visible flex or misalignment during operation, the rod guide assembly is the correct replacement.

22 Series Trim and Cylinder Compatibility

The 22 Series uses the 230L lever trim (works on both 22 rim and 2227 SVR) and the 210L knob trim. The trim-to-device interface on the 22 Series uses a tailpiece guide (part 22-ALK, 33A-ALK, 35A-ALK, 98-ALK, and 99-ALK are all the same tailpiece guide) that guides the rim cylinder tailpiece into the back of the exit device. This part is shared between the 22, 33A, 98, and 99 Series.

Von Duprin 33A/35A Series Parts

The 33A/35A Series is Von Duprin's highest-performing push pad exit device for narrow stile applications. The fluid dampener, deadlocking latch, and full concealed VR configuration range set it apart from both the 22 Series and the 55 Series for any application requiring high performance on a narrow stile door. Understanding the parts requires knowing which configuration is installed, because center cases, cover plates, and rod assemblies differ across rim, surface VR, and concealed VR versions.

33A vs 35A: The Case Style Distinction

The 33A has a grooved (ribbed) mechanism case exterior. The 35A has a smooth mechanism case exterior. Both are mechanically and dimensionally identical in every other respect. All internal parts, including the center case assembly, dogging shaft, end cap, latch bolt, and fluid dampener, are the same between 33A and 35A. When ordering parts for a 33A/35A device, the case style (grooved vs smooth) does not affect internal part numbers. It only affects the external center case cover, which is a cosmetic and protective component that is series-specific but not interchangeable between grooved and smooth styles.

Fluid Dampener: The Noise-Reduction Component

Every 33A/35A exit device is equipped with a fluid dampener that decelerates the push pad on its return stroke after being pressed. This is the feature that makes the 33A/35A appropriate for quiet-operation environments: healthcare corridors, educational facilities, and any space where the metal-on-metal snap-back of an un-dampened push pad would be a noise disturbance.

The fluid dampener is part of the mechanism case assembly. It cannot be replaced as a standalone field component: the dampener is integrated into the center case during manufacturing. If the dampener fails (indicated by loud snap-back noise on push pad return that was not previously present), the center case assembly replacement is the correct service action.

33A/35A Concealed Vertical Rod Configurations

The 33A/35A Series offers two concealed vertical rod configurations for different stile width situations.

3347A/3547A (concealed VR, 3-1/2 inch minimum stile): Used on hollow metal single and double doors where the stile is 3-1/2 inches or wider. The concealed rods run inside the door stile with no visible rod hardware on the door face. The top latch (part 050494) is used on both 33A, 35A, 98, and 99 concealed VR devices. This cross-series compatibility on the concealed top latch is one of the few cases where 33A/35A and 98/99 parts overlap on CVR configurations.

3348A/3548A (narrow concealed VR, 2-1/8 inch minimum stile): Used on hollow metal doors with stiles as narrow as 2-1/8 inches. This is the narrowest concealed VR configuration in the Von Duprin line and is specified on doors that cannot accommodate the 3347A minimum stile. Fire-rated versions (3348A-F and 3548A-F) support 8-foot by 10-foot door pairs at UL fire listing.

33A/35A and 22 Series Shared Dogging Shaft

The dogging shaft and dogging adapter that have been in production since 1998 are shared across the Von Duprin 22, 33, 33A, 98, and 99 Series devices. This is confirmed by the official Von Duprin parts catalog. The dogging shaft is the current standard replacement for any of these series when dogging function fails. The hex key dog conversion kit (parts 050114 and 050117) converts 33A and 99 Series hex key dogging to cylinder dogging, allowing a standard mortise cylinder to control dogging without carrying a hex key. The conversion kit does not include the cylinder.

33A/35A Alarm Kit (ALK)

The ALK alarm kit converts a 22, 33A, 35A, 98, or 99 Series exit device to an alarmed device. When the push bar is pressed, a 100dB battery-powered alarm sounds. The kit is powered by a standard 9-volt battery and controlled by a mortise cylinder (not included). The kit includes the EMERGENCY EXIT ONLY. ALARM WILL SOUND decal. An ALK power supply is available for hardwired operation of one or two alarm kits from a single 12V or 24V power source. Browse the exit alarm parts catalog at SecurityParts.com for ALK kits and Detex and Von Duprin Guard-X alarm components.

Von Duprin 55 Series Parts: The Crossbar Legacy Line

The Von Duprin 55 Series has been in production since at least the 1970s. It is the traditional crossbar exit device: instead of a push pad, it uses a suspended metal crossbar that spans nearly the full door width and activates the latch mechanism when any part of the bar is pressed. This design predates the push pad era and remains in production because it serves two applications that the pushpad cannot match: it is the only Grade 1 Von Duprin device for storefront aluminum doors with stiles at the absolute minimum of 1-3/4 inches, and it is the correct retrofit device for historic and mid-century buildings where maintaining the crossbar aesthetic is an architectural requirement.

55 Series Center Case (Part 050183)

The 55 Series center case (part 050183) is the core replacement housing for the 55 rim device. It includes all internal workings and the latch bolt. The center case geometry on the 55 Series is completely different from the 22, 33A, or 98/99 Series. Center cases are not cross-compatible. When ordering a replacement 55 Series center case, confirm the device is a 55 rim (single latch point) rather than the 5547 concealed VR, as these are different assemblies.

55 Series Lever Arm and Hinge Case Axle

The 55 Series uses a lever arm mechanism that connects the crossbar to the center case and activates the latch when the crossbar is pressed. The lever arms are handed: right hand (050355) and left hand (050356). Always confirm the device handing before ordering a lever arm.

The center case axle (090050) is used on the 55 rim device. The hinge case axle (090051) is used on the inactive housing (hinge side) and on all other 55 configurations including the 5547 CVR device. The arm bushing (050333) takes up the mechanical slack between the lever arms and the housing; it is a wear component that should be checked when lever arm movement feels loose or imprecise.

55 Series Trim: Dedicated and Non-Interchangeable

The 55 Series uses narrow stile-specific outside trim that is not compatible with any other Von Duprin series. The three standard trim options are 550DT (dummy pull, non-functional outside handle), 555NL (night latch with outside cylinder that locks and unlocks the push bar), and 379L (outside lever trim). Standard Von Duprin 360L, 230L, or 99/98 Series trim will not fit the 55 Series because the mechanism case geometry is different.

When a 55 Series installation needs outside trim replacement, always order from the 55-specific trim range. When a building has a mix of 55 Series and 98/99 or 33A devices, the trim from one series cannot be used on the other even if the finish matches.

5547 Concealed Vertical Rod: The 55 Series Double-Door Solution

The 5547 is the concealed vertical rod version of the 55 Series, used on double-door aluminum storefront configurations where both doors need the crossbar aesthetic with concealed rod latching. The 5547 blind fastener kit (900539) connects the rod control housing to the rods and is specific to the 5547 CVR only. The 5547 uses the hinge case axle (090051) as does all 55 Series hardware except the 55 rim center case.

Parts Cross-Compatibility: What Works Across Series and What Does Not

The most expensive parts ordering mistakes on Von Duprin exit devices happen at the series boundary. Some parts cross series; most do not.

How to Identify the Correct Series Before Ordering

The series identification that prevents a wrong-part return takes under 30 seconds on any Von Duprin installation.

Is there a push pad or a crossbar? A crossbar spanning most of the door width = 55 Series. A push pad (compact rectangular bar) = 22, 33A, 35A, 98, or 99 Series. Go to the next check.

Is the door stile wide (4 inches or more) or narrow (under 4 inches)? Wide stile hollow metal doors most often have 98/99 or 22 Series. Narrow stile aluminum storefront doors most often have 33A/35A or 55 Series. The device label on the mechanism case confirms the exact series.

Check the mechanism case label. The series number is on a label on the center case. This is the definitive identification. On the 33A, the case exterior has visible ribs (grooved). On the 35A, the case is smooth. Both are current generation if the center case cover is one piece. Older 33/35 Series (pre-2002) have a two-piece center case cover.

Browse the Von Duprin parts catalog at SecurityParts.com with interactive diagrams for all series. For Von Duprin electric strike parts compatible with 22 and 33A/35A rim exit devices, browse the electric strikes catalog. For Von Duprin Guard-X exit alarm parts, browse the exit alarms catalog. For the full Falcon exit device catalog as an alternative brand, browse the Falcon hardware catalog. Pre-order support is available at 845-935-0301 or through the contact page.

Related Parts and Products at SecurityParts.com

Von Duprin 22, 33A/35A, and 55 Series exit devices typically appear on egress doors alongside electric strikes for controlled entry and LCN door closers for self-closing operation on fire-rated assemblies.

For Von Duprin 5100, 6100, 6200, and 6300 electric strike parts compatible with 22, 33A/35A, and 55 Series rim devices, browse the electric strikes catalog. For Von Duprin Guard-X and Detex ECL and EAX exit alarm parts, browse the exit alarms catalog. For LCN door closer parts on fire-rated egress doors in the same building, browse the door closers catalog. For Schlage ND and ALX Series cylindrical lock parts on interior doors in the same facility, browse the cylindrical locks catalog. For Falcon 19, 24, and 25 Series exit device parts as an alternative brand on newer or renovation egress doors in the same building, browse the Falcon hardware catalog.

Browse the complete all products and parts catalog to source Von Duprin, Schlage, LCN, Falcon, and Detex hardware across the complete facility in a single session.

Security Parts carries parts for the LCN Benchmark 9130, 9140, and 9150 Series and the Senior Swing 9500 and 2800 Series automatic door operators. The Benchmark is low-to-medium duty with a 200-pound door capacity. The Senior Swing is the heaviest-duty version, rated for doors up to 600 pounds. The 9500IQ and 2800IQ Senior Swing generation adds AdaptivIQ self-calibrating technology that eliminates seasonal manual adjustments. Both lines use Push N Go non-switch activation that triggers when a person manually opens the door to 5 degrees. During power failure, both act as manual closers and do not block egress. All three Benchmark models use the same installation manual (740158). The 9500 is surface mounted; the 2800 is overhead concealed.

LCN automatic door operators are on more commercial entrances, healthcare corridors, and accessibility-required openings in North America than any other low-energy electromechanical operator brand. The Benchmark and Senior Swing lines cover the full range from budget-conscious retrofits through high-abuse institutional applications. When one fails or needs a component replacement, identifying the correct series, mounting configuration, and generation is the only way to order the right part without a return.

Browse the complete LCN parts catalog at SecurityParts.com, covering all LCN automatic operator and door closer product lines. For the full range of LCN door closer and automatic operator parts including the 4040XP, 4000 Series, Benchmark, and Senior Swing, browse the commercial door closer parts catalog.

What LCN Automatic Door Operators Do and Why They Exist

LCN automatic door operators are low-energy electromechanical swing door operators. They are distinct from full-power high-energy automatic door systems (the kind that open from a distance without any manual contact) and distinct from manual door closers (the hydraulic units that simply return a door to the closed position).

The specific application a low-energy operator fills is a door that is primarily intended for automatic use by people who cannot easily open a manual door, combined with the ability to be pushed open manually by regular pedestrian traffic. This two-in-one capability is what the ADA requires for accessible entrances where not every user needs automatic operation but where those who do cannot be expected to push a button or operate a separate actuator every time.

The code standard that governs these operators is ANSI/BHMA A156.19 (Power Assist and Low Energy Power Operated Doors). Both the Benchmark and Senior Swing series are certified to A156.19 and to ANSI A117.1 (Accessible and Usable Buildings and Facilities). UL listing is standard on both series.

LCN Benchmark Series 9130 9140 9150: What Each Number Means

All three Benchmark models share installation manual number 740158. If a technician has the manual for any one of the three models, it covers all three. The gear box part numbers in the LCN parts manual are series-specific, but the installation procedure is shared across the Benchmark family.

How the Benchmark 9130 9140 9150 Work: Key Features

Push N Go Non-Switch Activation

Push N Go is the feature that makes LCN Benchmark operators function without a separate wall-mounted push button for every passage. When a user manually pushes or pulls the door to approximately 5 degrees of opening angle, the operator's internal sensor detects the movement and the operator takes over, continuing to open the door fully and automatically.

After reaching full open, the door holds open for 1 to 30 seconds depending on the time delay adjustment, then closes automatically under spring force. The Push N Go feature means the door behaves exactly like a manual door for regular traffic (anyone can push it open normally) but automatically assists as soon as manual movement is detected, making it accessible without requiring button actuation from anyone in the traffic stream.

Power Boost Wind Compensation

The Benchmark includes a Power Boost function that provides additional closing force when the door is fighting wind resistance during the closing cycle. On exterior doors exposed to prevailing winds, a door closer set for normal closing speed may not fully close and latch the door during windy conditions. Power Boost detects when the closing cycle is being impeded and adds motor-driven closing force to ensure the door fully latches on every cycle. This is a passive feature that operates automatically without any adjustment.

Obstruction Reversal Safety

If the door contacts an obstruction during the closing cycle before reaching the latch position, the operator reverses direction and re-opens the door. This is a required safety function under ANSI/BHMA A156.19 for low-energy power-operated doors. The obstruction reversal prevents the door from closing on a person or wheelchair during the automatic closing sequence.

Power Failure Manual Operation

When power is lost, the Benchmark operator allows the door to be operated manually as a standard door. The operator does not lock the door or prevent movement during a power failure. This is a non-negotiable life safety requirement for any automatic door operator on a means of egress: power failure cannot result in a blocked exit.

LCN Senior Swing 9500 and 2800 Series: The Heavy-Duty Line

The Senior Swing is LCN's highest-duty automatic door operator line. Where the Benchmark is designed for low-to-medium traffic doors up to 200 pounds, the Senior Swing is built for high-abuse, high-traffic commercial applications with doors up to 600 pounds. Healthcare main entrances, hospital corridor fire doors, school main entries, and heavy hollow metal exterior doors in institutional applications are the typical Senior Swing specification environments.

Senior Swing Mounting Configurations

9500IQ and 2800IQ: The AdaptivIQ Generation

The current IQ generation of the Senior Swing adds AdaptivIQ self-calibrating technology. This is the most significant engineering advancement in LCN automatic door operator design in recent years and it addresses the most common complaint facilities managers have about automatic door operators in any brand: seasonal adjustment calls.

External conditions that affect an automatic door operator's performance change throughout the year. Wind pressure changes by season and weather event. HVAC stack pressure (the pressure differential between inside and outside created by building HVAC systems) reverses direction between summer and winter in most commercial buildings, which directly affects how hard the door operator must work to close against or with the pressure. Carpet compression, weather stripping condition, and door weight all vary. On conventional operators, each of these changes may require a field visit to adjust closing speed, hold-open time, or sensitivity settings.

AdaptivIQ continuously monitors door performance and adjusts operator parameters automatically to maintain consistent operation despite these changing external conditions. The result is fewer seasonal adjustment calls, more consistent operation across all weather conditions, and reduced total service cost over the operator's life cycle.

Senior Swing Power Failure Mode

Like the Benchmark, the Senior Swing acts as a manual door closer during a power failure. The LCN documentation specifically states it acts as a size 3 manual door closer when power is lost. The activating circuit opens the door from any position in the closing swing, meaning a partially closed door can still be manually opened during a power failure. This fail-safe design is required for egress compliance on any door on a means of egress.

Access Control Integration: The 1-Second Delay Feature

The Senior Swing includes a 1-second time delay between the activation signal from an access control system and the door beginning to open. This delay is a designed feature, not a malfunction. Its purpose is to allow enough time for an electrically controlled latch or electric strike to fully disengage before the operator begins pulling the door open. Without this delay, the operator would attempt to force the door open before the electric lock has released, either damaging the lock mechanism or failing to open the door completely.

This integration delay is one of the most frequently misdiagnosed behaviors on Senior Swing installations. When a facility first integrates an access control credential reader with a Senior Swing operator, the 1-second gap between credential read and door movement is sometimes reported as an operator malfunction by staff who expect immediate opening. The behavior is correct and intentional. Browse electric strike parts at SecurityParts.com for Von Duprin and Schlage electric strike components compatible with Senior Swing integrated openings.

Benchmark vs Senior Swing: Choosing the Right Operator

What Fails First on LCN Automatic Operators

Field service experience across Benchmark and Senior Swing installations reveals a consistent failure sequence. Knowing this before diagnosing saves time by directing attention to the most likely cause first.

1. Arm Assembly

The arm is the mechanical linkage between the operator unit and the door. It takes direct physical punishment every time the door opens and closes, including impact from carts, gurneys, wheelchair footrests, and manual push force. Bent, cracked, or loose arm assemblies are the most common physical failure on both Benchmark and Senior Swing operators. The arm type (single lever track for 9130, double lever for 9140, offset arm for Senior Swing) must be confirmed before ordering a replacement, as arms are configuration-specific.

For the Benchmark, the arm is a single replaceable component. For the Senior Swing, the arm assembly includes the arm, header plate, and connecting hardware. Always confirm the handing (right hand or left hand) and the mounting configuration (push or pull side) when ordering any arm assembly.

2. Gear Box Assembly

The gear box is the electromechanical drive mechanism that converts motor rotation into door movement. Gear box failure presents as a door that does not open when activated (motor runs but door does not move), a door that opens slowly and incompletely (stripped gears), or grinding noise during operation (gear wear). The gear box is a complete replacement assembly on both Benchmark and Senior Swing.

The LCN parts manual lists gear box assemblies by series number. Part numbers in the manual are 9130-3462SC (9130 Series gear box), 9140-3462SC (9140 Series gear box), and 9150-3462SC (9150 Series gear box). For Senior Swing, gear box part numbers are series-specific and documented in the separate Senior Swing parts section of the LCN Parts Manual. Always have the exact model number (including the series number and any suffix letters from the operator label) before ordering any gear box.

3. Control Board

The electronic control board manages all operator timing: hold-open delay, opening speed, closing speed, obstruction reversal, Push N Go sensing, and Power Boost. Control board failure presents as erratic behavior (door opens inconsistently, holds open indefinitely, or refuses to activate) after all mechanical components and power supply have been confirmed functional.

Before diagnosing a control board failure, confirm the power supply is correct (115VAC, single phase, 60Hz, fused at 15 amps), the arm is correctly connected, and the settings have not been inadvertently reset. A control board that has been reset to factory defaults by a power interruption may appear to have failed when it is actually operating correctly at its default settings, which differ from the field-adjusted settings that were in place before the power event.

4. Activator and Push Button Wiring

The wall-mounted push button actuator or access control signal wire is the most overlooked failure point on automatic door operators. A door that does not respond to button activation but opens correctly on Push N Go is almost always an actuator or wiring problem, not an operator failure. Check for loose wiring connections at the operator terminal block before assuming the operator has failed. On exterior installations, weather-related corrosion at the actuator wiring terminals is the single most common cause of button-activation failure that appears as operator failure.

5. Power Supply and Circuit

Both the Benchmark and Senior Swing require 115VAC, single phase, 60Hz power on a fused 15-amp circuit. A tripped circuit breaker is the most common cause of a completely non-responsive operator. Before any component diagnosis, confirm power at the operator terminal block with a voltage meter. The 15-amp circuit requirement is frequently violated in retrofit installations where the operator is connected to an existing circuit without verifying the available amperage. An undersized circuit produces intermittent operation as the circuit trips under the operator's starting current draw.

Adjustments and Settings: What Can Be Set in the Field

Both the Benchmark and Senior Swing support field adjustment of several operational parameters without requiring component replacement.

Hold-open time delay: Adjustable from 1 to 30 seconds on both series. This is the time the door remains fully open before beginning the closing cycle. For accessible routes, a minimum hold-open time that allows a wheelchair user to fully pass through before closing begins is required by ADA. The specific required time depends on the door width and the expected rate of passage for the building's user population.

Opening speed: The speed at which the operator drives the door from closed to full open. ANSI/BHMA A156.19 requires that low-energy operators open the door at a speed that does not create a hazard. An operator set to open too quickly can strike a person on the push side of an inswing door. Correct opening speed setting is a safety adjustment, not a preference adjustment.

Closing speed: The speed at which the door closes from the full open position to the latched position. This setting must balance between closing slowly enough to allow full passage time and closing quickly enough to latch before the next person activates the door.

Back check speed: On the Senior Swing, back check speed controls the door speed as it approaches the full open position, preventing the door from slamming into the stop at full opening. Incorrect back check speed setting causes repeated hard impacts between the door and door stop, which accelerates arm and door wear.

On the Senior Swing IQ generation, all speed and timing settings are stored in the controller's digital memory. Field adjustments replace the previous field settings in memory. The original factory defaults are always retained separately and can be recalled at any time, which is the basis of the factory default restore diagnostic described above.

How to Identify Your LCN Automatic Operator for Parts Ordering

Three pieces of information are needed before any LCN automatic operator parts order.

1. Model number: The model number is on a label on the operator housing. For mechanical products, the month and year of manufacture is also stamped near the packing nut at the base of the pinion where the arm attaches. For automatic operators, the label has the date of manufacture. The model number includes the series (9130, 9140, 9150, 9530, 9540, etc.) and any suffix letters that indicate handing, arm configuration, or generation (IQ suffix for the current AdaptivIQ Senior Swing generation).

2. Handing: Right hand (RH) or left hand (LH). Handing is determined by standing on the pull side of the door and noting which side the hinge is on. Right hand means the hinge is on the right. Left hand means the hinge is on the left. Arm assemblies and some mounting hardware are handing-specific.

3. Component failed: Arm assembly (mechanical linkage), gear box (electromechanical drive), control board (electronic controller), or activator/wiring (push button or access control wiring). The failure symptom determines which component to order. A door that does not move when activated but shows power at the terminal block points to the arm connection or gear box. A door that activates but behaves erratically points to the control board. A door that is completely unresponsive points to the power supply or activator wiring.

Browse the complete LCN parts catalog at SecurityParts.com for all Benchmark and Senior Swing components with series-specific diagrams. For the full LCN door closer and operator range including the 4040XP and 4000 Series surface closers and the 4630/4640 Auto Equalizer operators, browse the commercial door closer parts catalog. Pre-order support is available at 845-935-0301 or through the contact page.

Related Parts and Products at Security Parts

LCN automatic door operators are part of a complete door system that typically includes an electric strike or magnetic lock for access control, a door closer for fire-rated applications, and sometimes exit device hardware on egress doors. SecurityParts.com stocks all of these for a complete opening service call.

For Von Duprin electric strike parts on automatic operator openings with access control integration, browse the electric strikes catalog. For commercial exit alarm parts on automatic operator doors with alarm monitoring, browse the exit alarms catalog. For Von Duprin and Falcon exit device parts on automatic operator doors that also require panic hardware, browse the exit devices catalog. For Schlage ND Series cylindrical lock parts on adjacent doors in the same building, browse the cylindrical locks catalog. For Schlage L Series mortise lock parts on high-security entries in the same facility, browse the mortise locks catalog.

Browse the complete all products and parts catalog to source LCN, Schlage, Von Duprin, Falcon, and Detex hardware across the complete facility in a single session.

Security Parts carries parts for the Schlage CL Series cabinet locks and HL6 Series hospital latch locks. CL Series parts include the CL10-301 cylinder retaining screw, CL10-350 adapter spacer, CL10-352 slotted strike, CL10-354 bar strike (1/4 inch thick), CL10-355 bar strike (1/2 inch thick), and Schlage 36-031 trim collar. HL6 Series parts include the HL6 mortise paddle assembly, HL6 tubular paddle assembly, cover assembly, and bent tab mortise strike kit in engraved and non-engraved configurations. The HL6 uses the Schlage L Series mortise chassis. Mortise cylinders and housings are ordered separately from HL6 latches.

Two of the most specialized product categories in commercial door hardware sit in the same part of the SecurityParts.com catalog: Schlage CL Series cabinet locks and Schlage HL6 Series hospital latch locks. They serve completely different applications, but they share a common characteristic: almost every buyer who needs a replacement part struggles to find accurate technical information before ordering. Cabinet lock parts are rarely documented beyond a part number. Hospital latch parts carry healthcare-specific features like anti-barricade key override and lead lining that are absent from most parts supplier content.

Browse the Schlage CL Series cabinet lock parts catalog and the Schlage HL6 hospital latch lock parts catalog at SecurityParts.com. For the complete Schlage commercial hardware range, browse the Schlage commercial hardware catalog.

Schlage CL Series Cabinet Locks: What They Are and Why They Exist

The Schlage CL Series is a cabinet lock line built around the same full-size Schlage cylinders used in commercial door hardware, rather than the smaller wafer-based or cam-type cylinders common in most office furniture locks. This is the design decision that makes the CL Series different from every other cabinet lock on the market.

Standard office furniture locks use low-security wafer cylinders or small tubular cylinders that cannot be masterkeyed into a building's door hardware key system. A facility manager who keys their entry doors to a master system still needs a separate key for every cabinet, which creates key management complexity and the inevitable problem of employees losing multiple keys.

The CL Series solves this by using a standard Schlage cylinder that can be masterkeyed, grand masterkeyed, and keyed alike using the same key system as the building's ND Series cylindrical locks, L Series mortise locks, and B Series deadbolts. One key operates the offices, the storeroom, and the filing cabinets. This is the core specification reason the CL Series is used in commercial and institutional environments rather than standard hardware store cam locks.

Schlage CL Series Cabinet Lock Parts: Complete Reference

CL10-301: Cylinder Retaining Screw

The CL10-301 is the set screw that holds the cylinder in the cabinet lock housing. It seats into a detent in the cylinder housing and prevents the cylinder from rotating when the key is turned. When this screw loosens or strips, the entire housing rotates with the key instead of only the cylinder plug rotating. The symptom is a lock where turning the key spins the visible cylinder body rather than producing a bolt movement.

The CL10-301 is the most frequently replaced CL Series part. In high-cycle applications where the lock is opened and locked multiple times daily, the retaining screw vibrates loose over months of use. If a CL Series lock begins to feel loose or the cylinder has visible rotational play when the key is not inserted, check the CL10-301 first before diagnosing the cylinder or bolt mechanism. Tightening or replacing the CL10-301 resolves most CL Series cylinder rotation complaints without any additional parts.

CL10-350: Adapter Spacer

The CL10-350 is a spacer that accommodates thicker cabinet door or drawer face materials. When the cabinet panel is thicker than the standard lock body projection, the spacer extends the lock assembly to the correct mounting depth. Without the correct spacer, the cylinder head may sit below the cabinet face surface, preventing the key from engaging correctly or leaving the retaining screw inaccessible. The CL10-350 is also used when a standard-length CL Series cylinder does not reach the correct bolt engagement depth on a specific cabinet configuration.

CL10-352: Slotted Strike

The CL10-352 is a slotted strike for CL Series cabinet locks. Unlike a fixed-pocket strike, the slotted design allows the bolt to engage anywhere along the slot length rather than at a single fixed point. This accommodates minor misalignment between the bolt position and the frame pocket without requiring strike relocation or additional adjustments. It is the most forgiving strike option for field installations where the cabinet construction tolerance varies.

The slotted strike is the correct first choice for any CL Series installation where the bolt position relative to the frame has not been precisely measured and confirmed. If the bolt position is known and consistent, a bar strike provides a more secure engagement because it has defined pocket walls that prevent the bolt from shifting laterally under load.

CL10-354 and CL10-355: Bar Strikes

The bar strikes are flat bar-shaped strikes with a bolt pocket for the CL Series deadbolt. Both are 3/4 inch wide and 1-31/32 inch long. The CL10-354 is 1/4 inch thick. The CL10-355 is 1/2 inch thick.

The thickness distinction matters for how deep the bolt must travel before engaging the strike. A 1/4 inch bar strike is flush or nearly flush with the cabinet frame face, meaning the bolt engages quickly and with minimal throw distance consumed by the strike material itself. A 1/2 inch bar strike positions the bolt pocket deeper into the frame, requiring more bolt travel to engage. This is used when the gap between the cabinet door and frame requires additional standoff to position the pocket at the correct engagement depth.

Schlage 36-031: Trim Collar

The Schlage 36-031 trim collar is a cosmetic component that installs around the cylinder face to cover the bore hole in the cabinet panel. When a cabinet panel bore is oversized or the previous lock left a visible gap around the cylinder, the trim collar provides a finished appearance. It also covers minor damage around the bore from forced entry or tool marks. The 36-031 is available in standard finishes to match the cylinder face.

CL Series Lock Configurations: Door vs Drawer

The CL Series offers different cam configurations for door and drawer applications. A door lock uses a deadbolt cam that extends perpendicular to the cylinder body when the key is turned. A drawer lock uses a cam that rotates to release a drawer slide mechanism. The bolt style and cam orientation are specified at the full lock assembly level, not at the individual parts level covered here. When ordering replacement parts, always confirm whether the installation is a door or drawer configuration before ordering any cam or bolt component, as they are not interchangeable between the two applications.

Schlage HL6 Series Hospital Latch Lock: What It Is and Why It Exists

The Schlage HL6 Series hospital latch is a push-pull latch lock designed specifically for healthcare environments. The name comes from its defining feature: a paddle rather than a lever or knob. Instead of gripping and turning hardware, a person pushes or pulls the paddle to retract the latch. The paddle's short throw angle means the latch retracts with a light push or pull force that does not require tight grasping, tight pinching, or twisting of the wrist.

This is not just an ergonomic convenience. It serves three distinct functions in healthcare settings that no standard cylindrical or mortise lever lock satisfies.

First, it enables hands-free door operation. Nurses and doctors carrying equipment, trays, or patients cannot easily grip a lever. A paddle retracted with a forearm or elbow keeps the hands free and the door operational. Second, it delivers quiet operation. The HL Series is specifically engineered to reduce latch engagement and mechanism noise, which is a material factor in patient sleep quality and recovery in room-by-room studies. The current HL6 generation is 50% quieter than the previous HL Series design. Third, it provides institution-specific security functions including anti-barricade key override for behavioral health applications.

The HL6 uses the Schlage L Series mortise lock chassis: the same Grade 1 commercial mortise mechanism used in high-security L Series mortise locks on main building entries. This gives the HL6 the durability required for healthcare environments where doors cycle thousands of times per year under high-traffic, round-the-clock use.

HL6 Series Parts: What SecurityParts.com Stocks

HL6 Mortise vs Tubular: Choosing the Right Configuration

The HL6 is available in mortise and tubular versions. The mortise version uses the Schlage L Series mortise lock case installed inside the door, which requires a routed mortise pocket in the door edge. The tubular version uses a standard tubular latch mechanism, which requires only a face bore and edge bore without a mortise pocket.

For new construction healthcare facilities, mortise is almost always the correct specification. The L Series mortise chassis provides Grade 1 strength and durability that matches the high cycle count demands of a hospital patient room door. It is also compatible with the Von Duprin 9875 and 9975 mortise exit devices, which may be required on specific door applications within the healthcare building.

The tubular version is appropriate for renovation projects where the existing doors do not have a mortise prep and the budget does not allow door replacement. A tubular HL6 on an existing tubular prep door provides the push-pull ergonomics and quiet operation of the HL6 without requiring door replacement. The tradeoff is that the tubular version does not achieve the same durability under maximum cycle load as the mortise version.

HL6 Functions: Healthcare-Specific Security Operations

The HL6 offers 14 mechanical mortise functions, 2 electrified mortise functions, and 3 tubular functions. The functions that matter most for healthcare parts ordering are the ones with specific clinical safety features.

HL6-9010: Passage Function

The latchbolt is retracted by the paddle from either side. Inside paddle always free for immediate egress. The most basic function, used on non-secured interior corridor doors where free passage is always required. Parts for a passage function HL6 are the paddle assembly (mortise or tubular, engraved or non-engraved) and the cover assembly.

HL6-9040: Privacy Function (Bath/Bedroom)

The latchbolt is retracted by the paddle from either side unless the outside paddle is locked by the inside thumbturn. Actuating the inside paddle or closing the door unlocks the outside paddle. For emergency access, the outside has a release mechanism. This is the standard patient bathroom and private room function where a patient needs inside privacy but staff need emergency outside access.

HL6-9060: Apartment Entrance Function

The latchbolt is retracted from either side unless the outside is locked by key from inside. When locked, key or inside paddle retracts the latchbolt. Used on patient rooms where both patient privacy and staff key access are required simultaneously.

HL6-9070: Classroom Function

Latchbolt retracted by paddle from either side unless outside paddle is locked by key. Inside paddle always free for immediate egress. For medication rooms, treatment rooms, and other controlled-access clinical spaces where staff lock access from outside but egress from inside is always free.

HL6-9080: Storeroom Function

Latchbolt retracted by inside paddle or outside key. Outside paddle always inoperative. Auxiliary latch deadlocks latchbolt when door is closed. Inside paddle always free for immediate egress. For medical supply rooms and pharmacy areas where entry is controlled exclusively by key.

HL6-9082: Institution Function (Anti-Barricade)

Latchbolt retracted by key from either side. Outside paddle always inoperative. Inside paddle always free for immediate egress. The key override feature on this function allows the outside key to retract the latch even if the inside is being manually held. This is the anti-barricade function critical for behavioral health, psychiatric, and patient room applications where preventing barricade situations is a clinical safety requirement.

HL6 Special Options That Affect Parts Ordering

Lead Lining for Radiation Rooms

The HL6 lock case is available with a 1/8 inch lead lining insert for X-ray rooms, radiation therapy rooms, and any space where the door hardware must contribute to the room's radiation shielding. The lead lining is a factory option, not a field modification. It cannot be added to an existing non-lead-lined lock case.

When a radiation room HL6 needs paddle assembly replacement, the replacement paddle does not include the lead lining. The lead lining is inside the lock case body, not in the paddle. A paddle replacement on a lead-lined HL6 does not require a lead-lined paddle. The case body retains its lead lining throughout the product's life unless the entire lock case is replaced.

If the entire lock case of a lead-lined HL6 must be replaced (due to forced entry damage or mechanism failure), the replacement must be specified with the lead lining option. Ordering a standard non-lined replacement case for a radiation room removes the radiation protection at that opening without any visible indicator that a change has occurred.

Quiet Operation Engineering

The HL Series achieved its documented 50% noise reduction improvement over the previous HL Series generation through redesigned internal mechanism geometry that reduces the impact force of the latch bolt engaging the strike. This is not an adjustable feature and requires no specific maintenance to maintain. However, a correctly aligned strike is necessary for the quiet engagement to function as designed. A misaligned strike that causes the latch to contact the strike face edge rather than enter the bolt pocket cleanly produces noise regardless of the mechanism design. When a previously quiet HL6 installation begins producing latch noise, strike alignment is the first item to check before assuming the mechanism has failed.

Von Duprin Compatibility

The HL6 mortise version is compatible with the Von Duprin 9875 and 9975 mortise exit devices. This allows a single door to be specified with the HL6 push-pull operation on the inside and Von Duprin panic exit hardware on the outside, which is the standard configuration for healthcare patient room doors on required egress paths where both push-pull access and panic hardware are needed simultaneously. This compatibility is not available on the tubular version. Browse commercial exit device parts at SecurityParts.com for Von Duprin mortise exit device components.

Mounting Orientations: What Competitors Never Explain

The HL6 paddle assembly mounts in four orientations that determine how the paddles are positioned relative to the latch: handles up, handles down, one handle up with the other down, or horizontal with handles pointing away from the latch. This flexibility is what allows the HL6 to serve multiple door configurations without a different product for each application.

For corridor patient room doors, handles-down is the most common mounting: the paddles hang below the latch body in the familiar push-pull position that most healthcare workers recognize instinctively. For non-keyed passage functions, handles-up mounting is available, positioning the paddles above the latch body. Horizontal mounting is used when the door configuration requires the paddles to point horizontally rather than vertically.

How to Order the Correct Part for Each Product Line

CL Series Cabinet Lock Parts

Three pieces of information are needed: the symptom (cylinder rotates, bolt does not engage, bore is oversized), the application (door or drawer), and the cabinet panel gap dimension (for bar strike thickness selection). The CL10-301 retaining screw resolves most cylinder rotation complaints. The CL10-352 slotted strike is the safest first choice for any new strike installation. Bar strike thickness (CL10-354 vs CL10-355) is determined by measuring the gap between the closed door face and the cabinet frame face.

HL6 Hospital Latch Parts

Four pieces of information are needed: mortise or tubular chassis (confirmed by whether the door has a routed mortise pocket or only bore holes), engraved or non-engraved paddle, function (passage, privacy, classroom, storeroom, or institution), and whether the lock case has lead lining. Cylinders and housings are always ordered separately. For bent tab strike vs standard ASA strike, confirm the frame prep before ordering.

Browse the complete CL Series cabinet lock parts catalog and HL6 hospital latch lock parts catalog at SecurityParts.com. For the full Schlage commercial hardware range including L Series mortise lock parts, ND Series cylindrical lock parts, LT Series tubular lock parts, and B Series deadbolt parts, browse the Schlage commercial hardware catalog. Pre-order support is available at 845-935-0301 or through the contact page.

Related Parts and Products at Security Parts

CL Series cabinet locks and HL6 hospital latch locks are part of larger facility hardware programs. The same healthcare facility using HL6 latches on patient room doors uses L Series mortise locks on staff entries, LCN closers on corridor fire doors, and exit devices on egress stairwells.

For Schlage L Series and Falcon MA Series mortise lock parts on staff office and entry doors in the same healthcare facility, browse the mortise locks catalog. For Schlage ND Series and ALX Series cylindrical lock parts on utility and service doors, browse the cylindrical locks catalog. For Schlage LT and PT Series tubular lock parts on interior non-critical doors, browse the tubular locks catalog. For Schlage B Series deadbolt parts on secondary exit and storeroom doors, browse the deadbolts catalog. For LCN door closer parts on fire-rated corridor doors in healthcare and commercial facilities, browse the door closers catalog. For exit device parts on egress stairwells and fire exit doors, browse the exit devices catalog.

Browse the complete all products and parts catalog to source Schlage, Von Duprin, LCN, Falcon, and Detex hardware across the complete facility in a single session.

Security Parts carries parts for all Detex product lines. The ECL-230D is a complete battery-alarmed exit control lock with a 1-inch deadbolt and push bar. The EAX-500 is a surface-mounted battery door alarm that pairs with existing hardware. ADVANTEX is the super-heavy-duty exit device line for high-abuse applications. The AO19 is a low-energy automatic door operator for ADA-compliant hands-free access. The MC65 mortise cylinder (1-1/8 inch, Schlage C keyway) is the standard cylinder for ECL and EAX Series. The ECL-445K is the IKC lock cylinder replacement for the ECL-230D. The ECL-405-KIT is the cover lock key kit for both ECL and EAX series cover locks.

Detex has been manufacturing commercial door security hardware for over a century. The product line covers a wider range of functions than most commercial hardware brands: from the simple battery-powered EAX-500 door alarm through the complex ADVANTEX super-heavy-duty exit device with full electrified integration, to the AO19 automatic door operator for ADA-compliant accessibility applications. Each product line has its own parts ecosystem with specific cylinder, cover, and accessory requirements.

Browse the complete Detex hardware parts catalog at SecurityParts.com, covering all Detex product lines including ADVANTEX, Value Series, ECL, EAX, AO19, 90 Series, and Detex Trims. For the full exit alarm range including Detex ECL and EAX alongside the Von Duprin Guard-X alarm series, browse the commercial exit alarm parts catalog.

The Detex Product Lines: What Each One Is and Does

What Is the Detex ECL-230D and How Does It Work

The ECL-230D is the most widely misidentified product in the Detex line. It is not simply an alarm that gets added to a door. It is a complete panic exit control lock: a deadbolt with a push bar that meets life safety code requirements for panic hardware, combined with a battery-powered 100dB alarm system in a single unit.

When the deadbolt is in the locked position and the push bar is pressed, the bolt retracts for emergency egress and the alarm sounds simultaneously. The alarm can only be reset with a control key. The locking and unlocking of the deadbolt automatically arms and disarms the alarm respectively. This is the fundamental distinction from the EAX-500: pressing the ECL push bar both unlocks the door for egress and sounds the alarm. The EAX-500 only sounds an alarm; it does not control any locking mechanism.

ECL-230D Physical Specifications

The ECL-230D fits wood, hollow metal, and aluminum doors from 1-3/4 to 2-1/4 inches thick. The minimum standard door width is 20 inches. The design is non-handed, so the same unit installs on left-hand or right-hand doors. The attack-resistant design withstands over 2,200 pounds of outside pull force. The 1-inch throw deadbolt is saw-resistant. The lock body is made from corrosion-resistant alloy. The photo-luminescent sign absorbs ambient light and glows in the dark when lighting fails, meeting egress marking requirements without battery backup lighting.

The ECL-230D accepts 5-pin through 7-pin standard and interchangeable core rim cylinders. The IKC (Inside Key Control) cylinder is the ECL-445K. The OKC (Outside Key Control) uses rim cylinders. The cover lock is the mechanism that holds the cover assembly to the backplate and requires a separate cover key to access the battery compartment.

ECL-230D vs ECL-230X: Choosing the Right Version

The ECL-230X is the higher-security version of the ECL-230D. The key differences are a hardened deadbolt for break-in prevention and inclusion of the photo-luminescent sign as a standard component. Both versions produce a 100dB alarm and meet the same life safety code requirements. For most commercial secondary exit applications, the ECL-230D is the correct specification. For back doors on high-theft-risk retail environments, warehouses, and facilities with documented forced entry attempts, the ECL-230X provides additional resistance without changing the operating interface.

Detex EAX-500: Battery Door Alarm Parts and Configuration

The EAX-500 is a surface-mounted battery alarm designed for doors that need an audible deterrent without replacing the existing door hardware. It mounts on the door face or adjacent wall and uses a magnetic contact pair (one half on the door, one half on the frame) to detect door opening. When the door opens and breaks the magnetic contact, the piezo horn sounds at approximately 100dB.

EAX-500 Cylinder Configuration

The EAX-500 comes standard without a cylinder. Key control is optional:

The patented cam assembly inside the EAX-500 automatically adjusts for different cylinder sizes without requiring spacers. This is a genuine engineering advantage over competitor alarms where spacers must be sourced separately for non-standard cylinder lengths. The EAX-500's cam system accepts any standard mortise cylinder within the common range without modification.

EAX-500 Battery and Operation

The EAX-500 runs on a 9VDC battery. Low battery is indicated by an LED visual alert. The alarm can only be silenced by the proper control key. The extended bypass feature is standard: when the door is legitimately propped open (during a delivery or loading), the alarm remains bypassed and automatically rearms when the door closes. This prevents the nuisance alarm scenario where a propped door on a loading dock triggers continuous alarm until someone manually resets it.

The intelligent circuit automatically senses the magnet location on the door and sets the correct handing for the unit. This means the same EAX-500 unit installs correctly regardless of whether the door opens left or right, without any configuration switch adjustment. This self-handing feature is a field installation advantage that competitors' alarms do not universally offer.

EAX-500W: The Weatherized Version

The EAX-500W is the weatherized version for outdoor applications including exterior secondary exits, gate alarms, and doors exposed to direct weather. The weather-resistant housing adds moisture protection without changing the operational interface. All cylinder options available on the standard EAX-500 are available on the EAX-500W. For any Detex door alarm installation on a door exposed to direct precipitation or sustained humidity, always specify the EAX-500W rather than the standard EAX-500.

ECL and EAX Parts Reference: What to Order for Each Failure

Battery Replacement Procedure: ECL-230D and EAX-500

Both the ECL-230D and EAX-500 use 9-volt batteries accessed through the cover assembly. The procedure differs slightly between the two but follows the same sequence.

ECL-230D Battery Access

To access the ECL-230D battery: insert the cover key into the cover lock and turn counterclockwise until the cover releases. Swing the cover away from the backplate. The 9-volt battery is visible and accessible. Confirm battery voltage is a minimum of 7 volts if any doubt exists about the current battery condition. Replace with a fresh 9-volt battery, reconnect the battery terminal, and confirm all wiring connections are intact before closing the cover. Swing the cover back to the backplate and re-engage the cover lock. Test alarm function by pressing the push bar with the IKC in the locked position. The alarm should sound immediately.

EAX-500 Battery Access

The EAX-500 cover lock uses the cam lock at the top of the unit for cover access. Insert the cover key into the cam lock and release the cover. Replace the 9-volt battery and confirm LED arming indicators function on cover reinstallation. The EAX-500 includes LED visual and audible arming indicators that confirm correct operation after battery replacement. If the LED indicators do not respond correctly after a fresh battery installation, check the battery terminal connection and confirm the magnetic contact sensor is properly positioned before concluding the board has failed.

Detex ADVANTEX Exit Devices: Heavy-Duty Series Guide

The ADVANTEX line is Detex's response to high-abuse commercial applications where standard exit devices suffer accelerated wear. Schools, hospitals, airports, corrections, and retail environments with high daily cycle counts benefit from the ADVANTEX construction: stainless steel, vapor deposition finishes, and the widest electrified option set in the Detex lineup.

ADVANTEX Series by Configuration

ADVANTEX Electrified Options

Detex markets the ADVANTEX as having the most comprehensive electrified option set of any exit device in the industry. Available options include electric latch retraction (EL), electric integration (EI), alarm exit (EA), electric bridge (EB), delayed egress (EE), and electric latch monitoring. The EI option connects the exit device to building automation systems, access control panels, and security monitoring platforms, making the ADVANTEX appropriate for high-security environments that require centralized door status reporting.

Fire-rated ADVANTEX devices support 3-hour UL listing on steel doors. The F prefix designates fire-rated versions (for example, F6001 for the 60 Series fire version). Custom lengths from 24 to 48 inches are available. Devices shorter than 30 inches have restrictions on which electrified options are available; always confirm electrified option availability against the device length before specifying.

ADVANTEX Cylinder and Trim Accessories

ADVANTEX devices are ordered without cylinders as standard. Cylinders (C65) or interchangeable core housings (IC7) are pre-installed at the Detex factory when specified at order time. Knurling (KN), antimicrobial finish (AM), and lever switch (LS) options add to the base price. Lever trims for ADVANTEX are specified by function: key retracts latch (C), night latch (NL), dummy trim (DT), and blank escutcheon (BE). Lever trim handing must be specified (RHR or LHR) unless ordering exit-only configurations.

Detex AO19 Automatic Door Operator: What It Is and What Fails

The AO19 is categorically different from every other Detex product. It is not an alarm and it is not an exit device. It is a low-energy automatic door opener that mounts in the door header and powers the door open and closed using a motor-driven mechanism. Understanding what it is prevents it from being ordered to solve an alarm or exit hardware problem.

The AO19 is used on accessibility routes in commercial buildings where ADA requires hands-free door access: healthcare facility corridors, accessible restroom entries, building main entries on accessible routes, and any interior door on a required accessible path where manual door operation would present a barrier for mobility-impaired users.

AO19 Configurations: Single, Double, and Double Egress

The AO19-1 serves single doors. The AO19-2 serves double doors where both leaves open together on a single signal. The AO19-3 serves double egress applications where both doors open away from each other for bidirectional traffic. Each configuration requires separate operators for each leaf. The AO19-2 requires cable synchronization between the two operators for coordinated operation on double door pairs.

AO19 Electrical Requirements and Features

The AO19 runs on 115VAC from a standard outlet. The power source plugs into the header unit. A 3-way low-voltage ON/OFF/HOLD switch controls service and operational modes without requiring line voltage access. The obstruction reversal feature stops the door during a closing cycle and re-activates to open if an obstruction is sensed before the door reaches the latch position. This is the safety interlock that prevents the door from closing on a person or object in the opening.

The AO19 connects to existing access control systems, locking hardware, and building computer signals. A credential read or a wall-mounted push button activation signal triggers the operator to open the door. The controller module inside the operator can be adjusted for opening speed, hold-open time, and closing speed without special tools. Parts for the AO19 include the cover (aluminum or bronze finish), cable sync for twin AO19 UDC 1000 installations (part 104707), and motor/gearbox assemblies documented in the push and pull repair manuals available from Detex.

Detex vs Von Duprin Guard-X: Exit Alarm Comparison

SecurityParts.com carries both Detex and Von Duprin exit alarm products. They serve similar applications but with different design philosophies that affect which one is correct for a specific opening.

The Von Duprin Guard-X 2670 is a single-point rim exit alarm device that is the Von Duprin equivalent of the Detex ECL-230D. Both are battery-alarmed push-bar deadbolt devices meeting panic hardware requirements. The Guard-X uses a Von Duprin cylinder ecosystem while the ECL-230D uses its own IKC cylinder system with the ECL-445K. Facilities that have standardized on Von Duprin cylinders throughout a building may prefer the Guard-X to maintain key system continuity. Facilities that have standardized on Detex hardware or Schlage C keyway cylinders find the ECL series integrates more cleanly into their existing key schedule.

Browse the complete Von Duprin exit device and alarm range at the Von Duprin parts catalog. For the full exit alarm parts range including both Detex ECL and EAX series and the Von Duprin Guard-X, browse the exit alarm parts catalog.

How to Order the Correct Detex Part

Three pieces of information are required before any Detex parts order.

1. Product line (ECL, EAX, ADVANTEX, AO19, Value Series, 90 Series): Visible from the product label on the device. The full model number is on a label on the back plate or side of the unit. For ECL-230D, the model number confirms whether the standard or X (hardened deadbolt) version is installed.

2. Part type (cylinder, cover lock, cam bridge, magnet, cover assembly): Identifying which component has failed determines whether the order is the ECL-445K cylinder, the ECL-1576-15 cam bridge assembly, the ECL-405-KIT cover lock key kit, or the 102665 magnet kit.

3. Cylinder format (standard 5-7 pin, or IC): Confirm whether the installation uses standard conventional cylinders or IC format cores before ordering any replacement cylinder. The IC7 housing is required for IC installations, and the correct IC core must be sourced separately to insert into the IC7 housing.

Browse the complete Detex parts catalog at SecurityParts.com for all ECL, EAX, ADVANTEX, AO19, Value Series, and 90 Series components. Browse the full exit alarm catalog for Detex and Von Duprin alarm products side by side. Pre-order support is available at 845-935-0301 or through the contact page.

Related Parts and Products at Security Parts

Detex hardware appears on doors throughout commercial buildings alongside other hardware brands. The same building that uses Detex ECL-230D locks on secondary exits likely uses Von Duprin on main egress stairwells, LCN closers on fire-rated corridors, and Schlage cylindrical locks on office doors.

For commercial exit alarm parts including the full Detex ECL and EAX range alongside Von Duprin Guard-X parts, browse the exit alarms catalog. For commercial exit device parts including Falcon 19, 24, 25 Series and all Von Duprin series, browse the exit devices catalog. For Von Duprin exit device and alarm parts on doors where Von Duprin is specified alongside Detex, browse the Von Duprin catalog. For LCN door closer parts on fire-rated corridor doors in the same building, browse the door closers catalog. For Schlage ND Series cylindrical lock parts on office and interior doors in the same facility, browse the cylindrical locks catalog.

Browse the complete all products and parts catalog to source Detex, Von Duprin, Falcon, Schlage, LCN, and all other supported brands in a single session.

Security Parts carries parts for all three Falcon exit device series. The 19 Series is narrow stile, light-to-medium duty, rim and SVR only. The 24 Series is narrow stile, heavy duty, for aluminum storefront doors with stiles as narrow as 1-3/4 inches. The 25 Series is wide stile, heavy duty, for standard hollow metal and wood commercial doors. The 24 and 25 Series share a push pad design and the same service manual (108004). The most frequently replaced parts are the channel, end cap kit, dogging cover plate, and on electrified versions, the EL solenoid or HWEA alarm board. For pre-June 2012 alarm assemblies, the HWEA replacement board is part 650335.

Falcon exit devices are on more commercial egress doors in North America than any other panic hardware brand outside Von Duprin. The 19, 24, and 25 Series cover the full range of commercial applications: from light office and retail doors through aluminum storefront entries to institutional hollow metal fire-rated assemblies. Each series has distinct construction, stile requirements, and electrified option sets. Getting the right replacement part requires knowing which series is installed and which sub-configuration applies.

Browse the complete Falcon exit device parts catalog at SecurityParts.com, which includes the 19, 24, and 25 Series alongside the full Von Duprin and Detex exit device range. The Falcon hardware catalog covers all Falcon product lines including exit devices, mortise locks, and cylindrical locks.

Falcon 19 vs 24 vs 25 Series: Which One Is Installed

Before ordering any replacement part, identifying the series is mandatory. The three series look similar from a distance but are built for completely different door constructions. Ordering a 25 Series end cap for a 24 Series device, for example, produces a part that will not fit.

What Exit Device Configurations Mean for Parts Ordering

Each series offers multiple configurations that determine which latch hardware, rods, and strikes are involved. The configuration suffix on the model number tells you what is installed.

Why the Rim vs Vertical Rod Distinction Matters for Parts

A rim device has one latch point at the device head and uses a single rim strike on the door frame. A surface vertical rod device adds a bottom rod running from the device head to a floor bolt, creating two-point latching. The bottom rod, floor strike, and bottom latch components are additional parts unique to vertical rod configurations that rim devices do not use. If you are ordering a strike or latch bolt replacement, you need to know whether the installation is rim or VR before ordering.

The 25-V surface vertical rod uses a 3788 surface-applied top strike and a 2130 mortised bottom floor strike as the standard configuration. The 25-C concealed VR uses a 4188 mortised top strike and 2130 bottom standard, with 4155 and 2126A as bottom options. Fire-rated 25-C uses strike 1279 standard and F1280 for B label applications.

Falcon 19 Series Parts: Channels, End Caps and Key Components

The 19 Series uses a narrower channel profile than the 24 and 25 Series. All mounting screws are concealed; latch fasteners are exposed to the egress side. The push bar height is 1-3/4 inches. The stainless steel latch bolt has a 3/4-inch throw with deadlocking standard.

Falcon 24 Series Parts: Heavy Duty Narrow Stile

The 24 Series is built from extruded aluminum for maximum strength on narrow stile aluminum storefront doors. The construction provides greater impact resistance than the 19 Series at the same stile width. The push pad design is shared with the 25 Series, which is why both reference the same service manual 108004.

The 24 Series Door Thickness and End Cap Selection

The 24 Series serves aluminum storefront doors that come in two standard thicknesses: 1-3/4 inches (the most common commercial aluminum frame door) and 2-1/2 inches (thicker commercial storefront systems). The end cap kit part number changes based on this dimension. Part 650294 is for the 1-3/4-inch door and part 650348 is for the 2-1/2-inch door. Ordering the wrong kit produces an end cap that either leaves a gap at the stile edge or cannot seat against the door face at the correct depth.

Falcon 25 Series Parts: Wide Stile Heavy Duty

The 25 Series is Falcon's flagship exit device for standard commercial hollow metal and wood door applications. The center case is heavy wrought with sintered metal parts throughout the mechanism, making it more durable than extruded-only construction under heavy cycle loads. The top latchbolt is stainless steel with a 3/4-inch throw and deadlocking standard. Vertical rod configurations add a bottom bolt with a 1/2-inch throw.

25 Series Dogging: Half-Turn Hex, No Threads

Half-turn hex dogging is standard on the 25 Series with no threaded dogging components anywhere in the mechanism. Traditional threaded dogging on older exit devices requires turning a threaded rod several rotations, and the threads strip or corrode over time on high-cycle doors. The Falcon 25 Series half-turn hex design eliminates all threaded components from the dogging path. One half turn clockwise dogs the device. One half turn counterclockwise releases it. No stripping. No galling. This is why the 25 Series dogging mechanism outlasts competitor devices significantly on doors dogged and released multiple times daily.

Cylinder dogging is available as an option on the 25 Series using a 1-1/8-inch mortise cylinder with standard cam. This allows the outside cylinder to dog and release the device without carrying the hex key, which is the preferred configuration for reception desks and service counters where maintenance staff routinely dog the door at opening time.

25 Series Configurations and Stile Requirements

Stile requirements vary by 25 Series configuration. Standard 25-R and 25-V configurations require a 4-1/2-inch minimum stile. The 25-C concealed vertical rod configuration requires a 3-1/2-inch minimum stile on panic versions and 4-1/2-inch minimum on fire-rated F-25-C installations. The 25-CWDC (wood door wide cable configuration) requires a 6-1/2-inch minimum stile on wood doors. Ordering a 25-V or 25-C for a door with an undersized stile produces a device that cannot be correctly mounted.

25 Series Fire Ratings: A Label vs B Label

The Falcon 25 Series supports two UL fire ratings depending on the configuration. The B label (1-1/2 hour) is available on all 25 Series configurations. The A label (3-hour) is available on fire pairs (F-25-M x F-25-V or F-25-C), permitting up to 4-foot by 10-foot single doors and 8-foot by 10-foot pairs. When ordering strike replacements for fire-rated 25 Series installations, the fire strike specification matters. The F-25-C uses strike 1279 as standard and F1280 for B label applications. The F-25-V uses strike 299F for fire-rated top and 499F for fire-rated pairs with mullion.

Hex Dogging: How It Works and What Fails

Dogging is the function that holds the push bar depressed and the latch retracted, allowing the door to operate as a free-swinging door without requiring the push bar to be pressed on every pass. It is standard on the 24 and 25 Series panic versions and on the 19 Series panic version. It is never available on any fire-rated version of any series because holding a fire door latch retracted violates life safety code.

Hex dogging uses a hex key (Allen wrench) inserted into the dogging hole in the channel. On the Falcon 24 and 25 Series, the half-turn mechanism requires only a 180-degree rotation. The dogging cover plate conceals the dogging hole when not in use. This cover plate is a separately replaceable component if it is damaged or missing.

Electrified Options on the Falcon 24 and 25 Series

The Falcon 24 and 25 Series support a full range of electrified options for access control integration. Understanding the compatibility rules between these options prevents ordering combinations that cannot be installed together.

EL: Electric Latch Retraction

The EL option retracts the latch electrically without depressing the push bar, allowing the door to be opened from the outside by a credential reader, keypad, or building automation system. The EL solenoid operates at 24V DC and 0.34 amperes continuous duty. For 3-foot devices, the EL kit is part 650147. For 4-foot devices, it is part 650148. EL can be combined with FSA/FSE (fail safe/fail secure outside trim), DM (device monitoring), LM (latch monitoring), and AE/LK options. EL cannot be combined with ED (electric dogging), EA (exit alarm), HWEA (hard-wired exit alarm), or KOR (key override) on the same device.

Electric latch retraction serves two common use cases in commercial buildings. The first is controlled entry: a credential reader on the exterior side triggers the EL solenoid to retract the latch, allowing entry without pushing the panic bar. The second is electronic dogging during business hours: the building automation system energizes the EL solenoid for extended periods to hold the latch retracted as an alternative to mechanical hex dogging. This allows the door to operate in free-swing mode during hours and automatically re-latch when the solenoid is de-energized after hours.

EA and HWEA: Exit Alarm Options

The EA (exit alarm) option adds an audible alarm triggered when the push bar is pressed, providing delay notification or unauthorized egress alerting. The HWEA (hard-wired exit alarm) version connects to a building's wired fire alarm or security system.

The alarm circuit board replacement for pre-June 2012 HWEA assemblies is part 650335. This date boundary is critical: the alarm assembly design changed in June 2012. The 650335 board works only on pre-June 2012 assemblies. Post-June 2012 assemblies use a different alarm kit. Confirming the manufacturing date before ordering any alarm board replacement prevents a non-functional alarm installation.

KOR, LM, DM, RX: Monitoring and Override Options

KOR (key override) provides a cylinder that overrides the electrified outside trim functions without requiring electronic credentials. It is used when power failures need a mechanical fallback for authorized entry. LM (latch monitoring switch) monitors the latch bolt position and reports door open/closed status to the access control system. DM (device monitoring switch) monitors whether the push bar has been pressed. These two cannot be used on the same device because their switch mechanisms conflict. RX (request to exit switch) connects to an egress-side reader or motion sensor to signal the access control system that someone is approaching from the inside before the door opens.

How to Identify the Correct Part Before Ordering

Three pieces of information are needed before any Falcon exit device parts order.

1. Series (19, 24, or 25): Determined by the door construction and stile width as described above. The series number is typically visible on a label on the device channel or center case.

2. Configuration (R, V, C, CWDC, M): Visible from the door face. A rim device has a single latch point and no visible rod hardware on the door. A surface VR device has a visible bottom rod running down the door face to a floor strike. A concealed VR device has no visible rod hardware but two latch points (the concealed rods are inside the door stile).

3. Panic or fire-rated (prefix F-): Look for a fire label on the door or door frame. If a fire label is present, the device should be a fire-rated version. If ordering a replacement device, always match the fire rating of the original. If ordering a dogging cover plate, panic devices have a dogging hole; fire-rated devices do not.

Browse the exit device parts catalog at SecurityParts.com for all Falcon 19, 24, and 25 Series components with interactive diagrams. The Falcon hardware catalog covers exit devices alongside Falcon MA Series mortise locks and T Series cylindrical locks. Pre-order support is available at 845-935-0301 or through the contact page.

Falcon vs Von Duprin: Choosing Between the Two Exit Device Brands

Both Falcon and Von Duprin are Allegion brands. They share company ownership but serve different market positions and use different part ecosystems. Parts are not interchangeable between the two brands.

Von Duprin is the older and more widely installed brand in institutional, healthcare, and high-security government applications. The Von Duprin 98/99 Series is the dominant exit device in North American institutional buildings constructed before 2000. Von Duprin has a larger installed base and a wider parts aftermarket. Browse the complete Von Duprin parts catalog for 98/99, 22, 33/35A, 55, 75, 78, 88, and 94/95 Series devices.

Falcon is more common in mid-market commercial, retail, multi-family, and newer construction where the architectural aesthetic of the flush push pad and concealed fasteners is valued alongside ANSI Grade 1 performance at a competitive price. The 24 and 25 Series were specifically designed for the streamlined appearance requirements of modern commercial construction.

On any given building, both brands may be present: Von Duprin on older egress stairwell doors that have not been replaced, Falcon on newer tenant improvement entries and interior egress paths. SecurityParts.com stocks both, so a single order can service the complete building hardware schedule.

Related Parts and Products at Security Parts

A complete commercial egress door hardware package includes the exit device, door closer, and often an electric strike or exit alarm. SecurityParts.com stocks all of these for the same opening in one order.

For Von Duprin exit device parts on egress doors in the same building where Von Duprin is installed alongside Falcon hardware, browse the Von Duprin catalog. For Von Duprin electric strike parts on the door frame of any exit device installation with controlled entry, browse the electric strikes catalog. The Von Duprin 6300 electric strike is compatible with Falcon 24 and 25 Series rim devices. For commercial exit alarm parts including Von Duprin Guard-X and Detex ECL and EAX series, browse the exit alarms catalog. For LCN door closer parts on any fire-rated or controlled-closing egress door in the same building, browse the door closers catalog. For Schlage L Series and Falcon MA Series mortise lock parts on secured interior doors in the same facility, browse the mortise locks catalog.

Browse the complete all products and parts catalog to source Falcon, Von Duprin, Schlage, LCN, and Detex hardware in a single session.

Security Parts stocks Schlage tubular lock parts including the THP-8201 and THP-8301 passage spring latch assemblies, the THP-8219 and THP-8319 privacy latch assemblies, and the B and C design privacy roses. The THP part number encodes the backset: 82xx = 2-3/8 inch backset for 1-3/8 inch doors, 83xx = 2-3/4 inch backset for doors over 1-3/4 inch. Fire-rated versions carry the F suffix. Always confirm door thickness before ordering any THP latch assembly. The LT Series was discontinued in October 2025 and replaced by the PT Series, but THP latch and rose parts remain available for existing LT Series installations.

Tubular locks are on more interior doors in commercial buildings than any other lock type. Restrooms, private offices, utility closets, conference rooms, storage alcoves. They do not require keyed access in most of these applications. They do require reliable passage or privacy function, a latch that retracts cleanly under normal lever force, and on privacy doors, a restoring feature that prevents accidental lockouts after hours.

When a Schlage tubular lock latch fails or a privacy rose needs replacement, the THP part number system tells you exactly which component applies to which door thickness. Most wrong-part orders on tubular lock service calls come from a single error: ordering the 2-3/4 inch backset latch for a door that takes the 2-3/8 inch backset, or the reverse. This guide covers every part in the Schlage tubular lock catalog at SecurityParts.com, the functions, the fire-rated options, and the diagnostic steps that identify the correct part before you order. Browse the complete tubular lock parts catalog at SecurityParts.com.

What a Tubular Lock Is and Where It Belongs

A tubular lock uses a single bore through the door face for the entire lock chassis, with the latch assembly passing through a separate edge bore. The lock body threads directly through the door face bore. Both the inside and outside trim attach to the latch body rather than to a separate chassis housing.

This construction is lighter and less expensive than a cylindrical lock. The tradeoff is that tubular locks support fewer functions, accept fewer cylinder options, and do not achieve the same security ratings as cylindrical locks on keyed applications. In practice this is not a limitation for most tubular lock applications because the doors they serve do not require keyed locking at all.

The typical tubular lock application in a commercial building is a non-keyed interior door: a restroom, a private office where the occupant controls access by the inside privacy button, a conference room passage function, or a utility closet where entry control is not required. For any door that requires a keyed entrance function, a storeroom function, or a classroom lockdown function, browse the cylindrical lock parts catalog for the Schlage ND Series, ALX Series, or Falcon T Series instead.

Tubular Lock vs Cylindrical Lock: Choosing the Right Hardware

LT Series Functions: What Was Available

The Schlage LT Series offered four functions. Understanding which function is installed is the first requirement before ordering any replacement latch or trim component.

The THP Part Number System: How to Read It

Every Schlage LT Series latch assembly has a THP part number that encodes the function type and backset in its digits. Understanding this system eliminates the most common wrong-part order on tubular lock service calls.

Every Replaceable Component in the Schlage LT Series

Spring Latch Assembly (THP-8201 and THP-8301)

The spring latch is the beveled bolt that automatically extends when the door closes and retracts when the inside or outside lever is turned. On the LT Series passage function, both inside and outside levers always retract the latch freely with no locking mechanism involved.

Spring latch failure presents as a latch that does not retract when the lever is turned, a latch that does not spring back to the extended position after retraction, or a latch that binds in the faceplate and requires excessive lever force to retract. A latch that binds in the faceplate is often a door alignment problem rather than a latch failure: the door has settled and the latch tip is contacting the strike plate edge rather than the bolt pocket. Check strike alignment before replacing a latch that binds on closing.

Each THP spring latch assembly includes the latch body, faceplate, and mounting screws in the package. No additional hardware is required for a direct replacement on a door with matching backset.

Privacy Latch Assembly (THP-8219 and THP-8319)

The privacy latch assembly is more complex than the spring latch. In addition to the spring latch body, it includes the internal locking pin mechanism that engages when the push button on the inside rose is pressed, locking the outside lever. It also includes the restoring mechanism that releases the outside lever when the door closes.

Privacy latch failure presents as a latch that does not lock the outside lever when the push button is pressed, a push button that sticks in the locked or unlocked position, or a latch that does not restore to unlocked on door closing. The restoring mechanism is a cam component inside the latch body that detects door closing through the latch tip contact with the strike. If the door has a strike plate that is positioned so the latch tip does not fully contact the strike face on closing, the restoring function may not activate reliably. Verify strike plate position before diagnosing internal restoring mechanism failure.

Privacy Rose: B Design (Part 09-486) and C Design (Part 09-459)

The privacy rose is the cover plate on the inside face of the LT40 privacy door that contains the push button for locking the outside lever and the emergency access hole for unlocking from outside with a pin or coin. SecurityParts.com stocks two privacy rose designs for the LT Series:

Part 09-459 (C design privacy rose): The C design rose uses a rounder, more contemporary profile. Available in multiple finishes to match existing LT Series hardware.

Part 09-486 (B design privacy rose): The B design rose uses a slightly different profile. Finish-specific ordering required.

Privacy roses are finish-specific. Always confirm the finish code before ordering a replacement rose. The most common finish codes for LT Series hardware are 626 (satin chrome), 619 (satin nickel), 622 (matte black), and 625 (bright chrome). Installing a rose in the wrong finish leaves a visible mismatch on the interior door face that requires a second return and reorder.

Strike Plate

The LT Series uses a T-strike (T-shaped strike plate) as the default, not the ANSI curved lip strike used on cylindrical locks and deadbolts. The T-strike covers the latchbolt pocket in the door frame with a lip configuration that guides the spring latch tip into the pocket on every door close.

Strike options for the LT Series include the T-strike square corner (10-001 series, specify lip length from 1 inch to 2 inches), T-strike round corner (10-004, 1/4 inch radius, 1-1/8 inch lip length), and ANSI strike (10-025 series, 1-1/4 inch by 4-7/8 inch, specify lip length). The T-strike is typically used when the door frame has a standard tubular lock prep. The ANSI strike is used when the door frame prep matches the ANSI standard for cylindrical locks and the installer wants to use the same frame prep for both the tubular lock and any adjacent hardware.

Levers and Solid Brass Construction

The LT Series levers are manufactured from solid brass or solid stainless steel, not pressure cast zinc. This is the construction distinction that separates the LT Series from most competitor tubular locks and from the Schlage S Series and other economy tubular lines. Solid brass levers have a heavier feel, longer wear life, and a more premium finish durability than cast zinc levers.

The LT Series levers move both up and down for a bidirectional operational experience that matches the Schlage L Series mortise lock levers and Von Duprin exit devices. Inside and outside levers operate independently, allowing the inside lever to spring back without affecting the outside lever position. This independent operation creates a quieter, less institutional operational character compared to coupled-lever designs where both levers move together.

Fire-Rated Tubular Locks: When Are They Required

Fire-rated tubular locks are required when the door is part of a UL-listed fire-rated assembly. In commercial buildings, the most common application for fire-rated tubular locks is on restroom doors, private office doors, and utility closet doors in corridors or exit passageways that have a fire separation requirement.

Interior partition walls between office tenant spaces and building corridors often require a fire resistance rating. The doors in these walls must use hardware that is listed for the fire rating of the wall assembly. A 20-minute fire-rated door assembly is the most common rating level in interior partition applications. The Schlage LT Series with THP-F fire-rated latch achieves this 20-minute UL rating.

Schlage PT Series: The Current Replacement for LT Series

The Schlage PT Series became the replacement for the discontinued LT Series after October 2025. For facility managers maintaining mixed-generation buildings, understanding the differences matters for ongoing parts planning.

PT Series vs LT Series: Key Differences

The PT Series is purpose-built for four functions (passage, privacy, passage fire-rated, privacy fire-rated) with 10 lever styles and 6 finishes. The LT Series offered 31 lever designs and 14 finishes, which is why the LT Series was specified on premium projects requiring extensive design flexibility. The PT Series reduces the choice set in exchange for a more cost-competitive price point.

The PT Series uses a stainless steel latchbolt with a 1/2 inch throw. The snap-on wrought brass rose eliminates exposed rose screws for a cleaner finished appearance on the door face. The PT Series suites with the PM Series mortise locks using shared levers and rose designs, following the same suiting strategy as the LT and L Series relationship.

For new installations on premium projects requiring extensive lever design selection and L Series suiting, the LT Series parts available at SecurityParts.com support existing installations. For new installations where the PT Series sufficient design selection meets the specification, the PT Series is the current Schlage offering.

Parts Availability for Existing LT Series Installations

SecurityParts.com stocks THP latch assemblies and privacy roses for existing LT Series installations. A building specified with LT Series hardware in 2018 or 2022 will need THP latches and privacy roses for the next 15 to 20 years of normal service. The discontinuation of the LT Series as a new product does not affect the availability of replacement parts for installed units. Browse the tubular lock parts catalog for current stocking status on all THP assemblies.

How to Identify the Correct THP Part Before Ordering

Two measurements and one visual check are all that is needed before any THP parts order.

1. Measure the backset. The backset is the distance from the center of the door bore to the edge of the door face. On a standard commercial hollow metal or solid core wood door, measure from the center of the door handle hole to the door edge. If this dimension is approximately 2-3/8 inches, order THP-82xx. If approximately 2-3/4 inches, order THP-83xx. Do not guess. A THP latch with the wrong backset will not reach the strike properly and the door will not latch correctly.

2. Identify the function (passage or privacy). Does the current installation have a push button on the inside rose? If yes, it is a privacy function. Order THP-8219 or THP-8319. If the inside and outside levers both always retract the latch freely with no button, it is a passage function. Order THP-8201 or THP-8301.

3. Check the door for a fire label. Look at the top or hinge edge of the door for a UL fire label. If present, order the F-suffix version of the correct THP latch. If no label is visible, the standard non-F version is appropriate.

Browse the Schlage tubular lock parts catalog at SecurityParts.com with part numbers and diagrams for every THP assembly. For the complete Schlage hardware range including LT Series tubular locks, ND Series cylindrical locks, L Series mortise locks, and CS210 interconnected locks, browse the Schlage commercial hardware catalog. Pre-order support is available at 845-935-0301 or through the contact page.

What Fails First on Schlage Tubular Locks

1. Spring latch assembly. Latch spring fatigue is the primary failure mode on high-cycle doors. The latch bolt does not return to the extended position after retraction, which means the door does not latch on closing. A door that requires a push to close and latch is always a spring latch issue. Replace the full THP assembly, not just the spring.

2. Privacy push button mechanism. On LT40 privacy doors, the push button or the internal locking pin can wear or bind after years of use. The symptom is a push button that requires excessive force to depress, does not stay in the locked position, or pops out immediately without locking the outside lever. The privacy latch assembly (THP-8219 or THP-8319) replaces the complete mechanism.

3. Restoring mechanism failure. The restoring feature that unlocks the outside lever on door closing can fail to actuate if the latch tip does not fully contact the strike plate on closing (strike misalignment) or if the internal restoring cam wears. Always check strike alignment before assuming the restoring cam has failed. Adjusting the strike position often restores this function without any parts replacement.

4. Rose assembly. The inside privacy rose sustains the most cosmetic wear of any component because it receives direct hand contact on every entry and exit. Finish wear and physical cracking from abuse require rose replacement. Always confirm the design (B or C) and finish code before ordering.

5. Lever assembly. The solid brass levers on the LT Series are more durable than cast zinc alternatives, but they can still bend or crack under deliberate physical abuse. Lever replacement requires confirming the specific lever design from the 31 LT Series options and the finish code.

Related Parts and Products at SecurityParts.com

Tubular locks are typically part of a complete interior door hardware package. The same building that uses LT or PT Series tubular locks on restroom and corridor doors also uses cylindrical locks on offices, mortise locks on entries, and door closers on fire-rated corridor doors.

For Schlage ND Series, ALX Series, and Falcon T Series cylindrical lock parts on keyed office doors and storerooms in the same facility, browse the cylindrical locks catalog. For Schlage L Series and Falcon MA Series mortise lock parts on main entry doors and secured offices, browse the mortise locks catalog. For Schlage CS210 interconnected lock parts on dwelling unit entry doors requiring single-motion egress, browse the interconnected locks catalog. For Schlage B Series deadbolt parts on secondary doors, browse the deadbolts catalog. For LCN door closer parts on fire-rated corridor doors in the same building, browse the door closers catalog. For Von Duprin and Falcon exit device parts on building egress doors, browse the commercial exit devices catalog.

Browse the complete all products and parts catalog to source Schlage, Von Duprin, LCN, Falcon, and Detex hardware in a single session.

The Schlage CS210 is the CS200 Series Grade 2 interconnected lock. It combines a cylindrical latch and deadbolt in one assembly so turning the inside lever retracts both simultaneously in one motion, meeting IBC and NFPA 101 single-motion egress requirements. The main replacement parts are the lever kit (06-242), rose (08-029), inside escutcheon (Camelot or Plymouth), outside housing (B500 commercial or B60 residential), strikes, and the interconnect assembly. The crimp-to-snap rose transition in August 2015 is the most important fact for parts ordering: pre-2015 units with crimp-on roses require the outside chassis assembly (F206-496) when changing levers or roses.

Interconnected locks are on more apartment building, hotel, dormitory, and assisted living entry doors than any other lock type in the multifamily residential sector. They are specified because they solve a specific problem that no other single hardware component solves: providing both a spring latch for automatic latching and a deadbolt for security, while allowing a single inside lever motion to retract both simultaneously for code-compliant egress.

The Schlage CS210 is the most widely installed commercial interconnected lock in North America. It carries ANSI/BHMA Grade 2 certification, UL 3-hour fire door listing, and a lifetime limited mechanical warranty. When one fails or requires a lever change, rose replacement, or escutcheon update, the rose generation transition in 2015 creates a parts compatibility issue that catches most technicians off guard. This guide covers every component, that transition, the code context, and exactly how to order. Browse the complete interconnected lock parts catalog at SecurityParts.com for CS210 diagrams and components.

What an Interconnected Lock Is and Why It Exists

An interconnected lock is a single hardware assembly that combines two separate locking mechanisms, a spring latch and a deadbolt, with a mechanical interconnection that allows both to retract simultaneously when the inside lever is turned. From the outside, the lock operates as a standard keyed deadbolt entry. From the inside, turning the lever once retracts both the deadbolt and the latch in a single motion, allowing free exit without any separate deadbolt thumb turn operation.

This single-motion egress capability is the entire reason the category exists. IBC Section 1010.1.9 and NFPA 101 both require that doors in a means of egress unlatch with no more than one releasing motion. For most commercial occupancies, installing a separate cylindrical latch and a separate deadbolt creates a two-motion exit requirement that violates this code, because the occupant must turn the deadbolt thumb turn and then turn the lever separately to exit.

The interconnected lock solves this by making the inside lever turn the only operation needed for exit. The deadbolt and latch both retract together. The door opens. One motion. Code compliant.

Where the Schlage CS210 Is Specified

The CS210 appears most frequently on dwelling unit entry doors in commercial multi-family buildings: apartment complexes, condominiums, dormitories, extended-stay hotels, and assisted living facilities. The specific application logic that drives the CS210 specification is the need for resident-facing security with single-motion egress in a commercial-grade fire-rated assembly.

Assisted living facilities are a particularly important distinction. Assisted living units are classified as Residential Board and Care occupancies under NFPA 101, not standard residential occupancies. The residential dwelling unit exception that allows a separate deadbolt does not apply to assisted living units. On assisted living dwelling unit entry doors, an interconnected lock or mortise lock is required in most jurisdictions because a separate deadbolt and latchset do not comply with one-motion egress for this occupancy type.

For institutional dormitories, hotel properties, and any jurisdiction with accessible or adaptable unit requirements, interconnected locks are often specifically mandated by local code supplements to the IBC. Massachusetts 521 CMR, for example, explicitly requires interconnected locks on accessible and adaptable dwelling units.

CS210 vs Separate Deadbolt vs Mortise Lock: Which One Fits the Opening

Every Component in the Schlage CS210

Outside Housing Assembly: B500 vs B60

The CS210 offers two outside deadbolt housing configurations. This is the first specification decision and it determines the security level of the entire assembly.

CS210-B500 (commercial spin ring): The B500 outside housing includes a free-spinning cylinder collar that resists wrenching and prying. It also includes a removeable security shield that protects the deadbolt from ice-pick attacks through the door face. These are the same security features found in the Schlage B600 Series Grade 1 deadbolt. The B500 housing is the correct specification for any commercial or institutional application where physical attack resistance matters. The cylinder collar spins freely under wrench pressure rather than providing purchase for torque.

CS210-B60 (residential spin ring): The B60 housing is the residential version for multi-family buildings where the aesthetic and cost profile of a residential deadbolt is appropriate and the additional attack resistance features of the B500 are not required by the specification.

Lever Kit (Part 06-242)

The CS210 lever kit (part 06-242) includes two matching levers, one outside and one inside. The CS200 Series offers 18 lever designs allowing the CS210 to match the aesthetic of other Schlage hardware throughout the same building. Lever designs are available in seven finishes including satin chrome (626), brushed nickel (619), matte black, polished brass (605), aged bronze, and others.

Lever replacement is needed when a lever is physically damaged, when a finish change is required after a renovation, or when a lever becomes stiff or fails to return to horizontal due to internal spring fatigue. The lever kit includes both levers, which keeps inside and outside matching during replacement. Always confirm the finish code before ordering a replacement lever kit.

Rose (Part 08-029)

The rose is the circular cover plate visible on the door face around the outside lever and cylinder area. The CS210 offers two outside rose designs: Plymouth and Saturn. The rose is finish-specific. Part 08-029 is the standard rose for snap-on rose installations (August 2015 and later). For crimp-on rose installations (pre-August 2015), see the crimp-to-snap section below before ordering any rose replacement.

Inside Escutcheon: Camelot (CAM) and Plymouth (PLY) Designs

The inside escutcheon is the decorative plate on the interior face that covers the inside chassis and positions the inside lever and thumb-turn plate. The CS210 offers two inside escutcheon designs: Camelot (CAM) and Plymouth (PLY). Both designs are available in the same seven finishes as the levers.

The inside escutcheon houses the adjustable thumb-turn plate assembly that supports both the 4-inch and 5-1/2-inch center-to-center door prep conversions. The escutcheon plate adjustment is a field modification; no additional parts are ordered for a center-to-center conversion. If the escutcheon itself is damaged or a design change is required, the escutcheon is an individually replaceable component.

Interconnect Assembly

The interconnect assembly is the internal mechanism that links the inside lever to both the deadbolt and latch, enabling the simultaneous retraction in one motion. This is the component that makes an interconnected lock different from a standard cylindrical lock with a separate deadbolt.

The interconnect assembly carries the load of both the deadbolt spring and the latch spring when the inside lever is turned. This combined spring load requires slightly more torque to operate than either a latch-only or deadbolt-only lock. The design intent is that a healthy adult requires no additional force beyond a normal lever turn. However, the combined spring load can become problematic for elderly, infirm, or physically limited occupants on doors where both springs are at the high end of their adjustment range. If a CS210 installation is reporting difficulty operating the lever, check that neither spring is adjusted beyond the standard setting before assuming the interconnect assembly has failed.

Interconnect assembly replacement is required when the inside lever turns but only one of the two mechanisms (latch or deadbolt) retracts, when the interconnect binding causes the lever to feel mechanically stiff at a specific point in its rotation arc, or when the assembly fails to fully return to the latched position after a lever release. Center-to-center conversion (4 inch to 5-1/2 inch or reverse) is made by a field modification to the interconnect assembly without requiring a replacement part.

Strike Plate (Part 10-109 and 10-121 Combination Strikes)

The CS210 uses a combination strike that includes both a deadbolt strike and a deadlatch strike in a single plate assembly. Both strikes must be correctly positioned in the door frame for the lock to operate without binding. The CS210 standard combination strike is part 10-109. The 10-121 is an alternate combination strike. A T-strike (1-5/8 inch by 2-1/4 inch) is also available for the deadbolt portion.

Strike alignment is the most common cause of a CS210 installation that feels stiff or incomplete on either the deadbolt throw or the latch engagement. Because the CS210 operates two mechanisms simultaneously, even minor vertical misalignment of either strike pocket creates binding that feels like internal mechanism failure. When a CS210 is reported to be stiff or incomplete in its operation, verify both strike alignments before diagnosing internal components.

The CS210 also includes a metal wood frame reinforcer using 3-inch screws that anchor into the door frame stud for kick-in resistance. This is the same dust box concept as the B Series deadbolt and its presence significantly increases the resistance of the frame to forced entry. It should always be installed and is not optional on any security-sensitive application.

Deadbolt Strike (Part 10-116)

The deadbolt-only strike (part 10-116) is a round corner strike, 1-1/8 inch by 2-3/4 inch, no lip. This is used when the deadbolt and latch have separate frame preps rather than a combined pocket. Always confirm whether the installation uses a combination strike or separate strikes before ordering replacement hardware.

The Crimp-On to Snap-On Rose Transition: The Most Important CS210 Service Fact

In August 2015, Schlage transitioned the CS210 from crimp-on roses to snap-on roses. This transition is completely undocumented in most parts supplier catalogs and is the single most common cause of wrong-part returns on CS210 service calls.

How to Identify Which Generation Your Lock Is

Remove the outside rose from the door face. Examine the base of the rose where it meets the door surface. Snap-on roses have retention dimples at the base. Crimp-on roses do not have these dimples and have a smooth or rolled edge at the base instead. If you are not certain which generation is installed, this physical check takes under two minutes and prevents an incorrect parts order.

What Happens If You Order the Wrong Generation

The lever kit (06-242) and rose (08-029) designed for snap-on rose installations cannot be used on a crimp-on rose chassis. The retention mechanism is physically different and the lever will not seat correctly. If you have a pre-August 2015 installation with a crimp-on rose and order the current lever kit without also updating the outside chassis, the parts will not function correctly after installation.

The Correct Crimp-On to Snap-On Upgrade Parts

For a pre-August 2015 crimp-on rose installation that needs a lever or rose replacement, order all four of these components together:

Center-to-Center Door Prep Conversion: Field Modification Without Parts

The CS210 adjustable escutcheon plate supports both 4-inch and 5-1/2-inch center-to-center door preparations. This is the dimension between the centerline of the deadbolt bore and the centerline of the cylindrical latch bore on the door face.

The conversion is made entirely in the field by modifying the interconnect assembly position inside the escutcheon plate. No additional parts are required and no replacement components need to be ordered. The procedure is:

For 4-inch center-to-center: Remove two screws and the plate from the escutcheon assembly. Position the thumb-turn assembly with the thumb turn toward the bottom of the thumb-turn escutcheon plate.

For 5-1/2-inch center-to-center: Keep the plate in place with the two screws. The thumb-turn remains in its standard position.

This field adjustability is the design feature that eliminates job-site surprises when the existing door prep does not match a specific standard. A building with mixed 4-inch and 5-1/2-inch door preps can use the same CS210 lock on every unit door without ordering two different lock configurations.

CS210 Technical Specifications

Parts That Fail First on the Schlage CS210

Based on actual field service frequency, here is the realistic replacement sequence for CS210 components on high-traffic multi-family installations.

1. Levers. The outside lever takes physical contact on every door entry and exit. Finish wear is the most common cosmetic issue. Physical damage from cart impact or door abuse is the most common functional issue. The lever kit (06-242) replaces both inside and outside levers. Always check the rose generation before ordering (crimp vs snap as described above).

2. Strike plate alignment. This is not a parts failure but a maintenance item. Door settling in multi-family buildings causes progressive strike misalignment that shows up as a stiff deadbolt throw, incomplete latch engagement, or a lever that requires more force than normal. Check both strike alignments before diagnosing internal components. Re-securing loose strike screws or adjusting the strike position resolves most CS210 stiffness complaints without any parts replacement.

3. Cylinder. The 6-pin C keyway cylinder in the CS210 wears at the same rate as any commercial cylinder under high-cycle use. Key stiffness or a key that operates inconsistently indicates cylinder wear. As with all Schlage cylinders, use only graphite or silicone lubricant. Oil-based lubricants accelerate pin stack contamination and require cylinder replacement.

4. Inside escutcheon assembly. The inside escutcheon is subject to cosmetic damage on unit entry doors where residents are frequently carrying items. A cracked escutcheon plate or a finish that has worn through requires replacement as a complete escutcheon assembly. Confirm the Camelot or Plymouth design before ordering.

5. Interconnect assembly. The internal interconnect mechanism has the longest service life of any component in the CS210 because it is protected inside the door and does not receive direct physical contact. Interconnect failure appears as a lever that retracts one mechanism but not the other, or as an inconsistent combined retraction. Full interconnect replacement is required when this occurs.

Code Compliance: Interconnected Lock vs Separate Deadbolt on Dwelling Unit Doors

The code question that drives most CS210 specifications is whether a separate deadbolt is allowed on a dwelling unit entry door or whether an interconnected lock is required.

Where Separate Deadbolts Are Allowed

IBC Section 1010.1.9 and NFPA 101 both include an exception for Group R residential dwelling units with an occupant load of 10 or less. On these doors, a separate nightlatch, deadbolt, or security chain is permitted in addition to the latching hardware, provided the separate device can be released from the inside without a key or tool. A thumbturn-operated single cylinder deadbolt meets this requirement.

This exception applies to most apartments, condominiums, dormitory rooms, hotel rooms, and similar units. It is the reason separate deadbolts are common on apartment doors throughout the United States. In these jurisdictions, the CS210 is a premium specification option, not a code requirement.

Where Interconnected Locks Are Required

Several situations eliminate the separate deadbolt exception and require one-motion egress on dwelling unit entry doors. The first is when the local jurisdiction has adopted stricter requirements than the model codes. The second is for accessible or adaptable dwelling units in jurisdictions following accessibility standards that mandate one-motion egress hardware. The third is for assisted living and residential board and care facilities where the NFPA 101 residential occupancy exception does not apply. In all three situations, an interconnected lock or mortise lock is the only code-compliant hardware solution for a door requiring both a latch and a deadbolt.

How to Order CS210 Parts Without a Return

Four pieces of information are required before any CS210 parts order:

1. Rose generation (crimp or snap): This is the most important check. Remove the outside rose and look for retention dimples at the base. Dimples = snap-on (August 2015 or later). No dimples = crimp-on (pre-August 2015). If the lock is pre-2015, the outside chassis (F206-496) must be ordered along with the lever kit and rose.

2. Outside housing type (B500 or B60): The B500 has a free-spinning cylinder collar and security shield. The B60 does not. This is visible without disassembly: grip the exterior cylinder collar and attempt to rotate it. Free spin = B500. Fixed = B60.

3. Inside escutcheon design (Camelot or Plymouth): The Camelot design has a more traditional rectangular profile. The Plymouth has a more contemporary rounded shape. Both are visible on the interior door face without disassembly.

4. Finish code: Visible on the hardware face. Common CS210 finishes include 626 (satin chrome), 619 (satin nickel), 622 (matte black), 625 (bright chrome), and 605 (polished brass). All replacement components are finish-specific.

Browse the complete CS210 parts catalog at SecurityParts.com. For the full Schlage commercial hardware range including the CS210, ND Series, L Series, and B Series, browse the Schlage commercial hardware catalog. Pre-order support is available at 845-935-0301 or through the contact page.

Related Parts and Products at Security Parts

A complete multi-family unit entry door typically includes the interconnected lock, a surface door closer (required by fire code for self-closing on fire-rated corridor-to-unit assemblies), and sometimes an electric strike for access control on the corridor side. SecurityParts.com stocks all of these in one catalog.

For Schlage B Series deadbolt parts on unit entry doors where a separate deadbolt is permitted and specified instead of an interconnected lock, browse the deadbolts catalog. For Schlage ND Series and ALX Series cylindrical lock parts on common area corridor doors, mailroom doors, and amenity space doors in the same building, browse the cylindrical locks catalog. For Schlage L Series mortise lock parts on main building entry doors and management office doors requiring Grade 1 performance, browse the mortise locks catalog. For LCN door closer parts on unit entry doors and corridor fire doors in the same building, browse the door closers catalog. For Von Duprin exit device parts on building egress stairwells and exit doors, browse the commercial exit devices catalog.

Browse the complete all products and parts catalog to source Schlage, Von Duprin, LCN, Falcon, and Detex hardware in a single session.

Security Parts carries parts for the Schlage B Series commercial deadbolts. The B600 Series is Grade 1, Schlage's strongest commercial deadbolt. The B500 Series is Grade 2 for lighter applications. The most commonly replaced parts are the tailpiece (driver bar), the cylinder, and the strike plate. If a new B Series installation won't lock or unlock, rotate the driver bar 90 degrees toward the hinges before reinstalling. If the key turns but the bolt doesn't move, the tailpiece is stripped and needs replacement. Never use oil-based lubricants on B Series cylinders. Use graphite or silicone only.

Schlage B Series deadbolts are on more commercial and institutional doors than any other deadbolt brand in North America. They show up on office suites, storage rooms, corridor doors, exterior entries on healthcare and government buildings, and any secondary door on a commercial property that needs a reliable keyed bolt without the complexity of a full mortise lock.

When one fails, the repair is usually one of three things: a worn tailpiece, a failing cylinder, or a misaligned strike plate. Getting the right replacement part requires knowing the series (B500 vs B600), the cylinder format, and in some cases the finish code. This guide covers every component, every failure mode, every function, and the field-tested troubleshooting sequence that identifies the correct part before you order anything. Browse the complete Schlage B Series deadbolt parts catalog at SecurityParts.com for interactive diagrams on every model.

How a Commercial Deadbolt Works

A deadbolt operates differently from a spring latch. A spring latch clicks into the strike automatically when the door closes and retracts when the lever or knob is turned. A deadbolt does neither automatically. It extends only when the cylinder is turned with a key or the thumb turn is rotated, and it retracts only by the same means. Once extended, it cannot be pushed back by end pressure, a credit card, or a shimming tool.

Inside the lock body, the cylinder cam engages the tailpiece when the key is turned. The tailpiece connects the cam to the deadbolt bolt mechanism and drives the bolt in or out. On a single cylinder deadbolt, a thumb turn connects to the same bolt mechanism from the inside. On a double cylinder deadbolt, a key cylinder replaces the thumb turn on the inside.

The deadbolt throw on both B500 and B600 series is 1 inch. On a correctly installed B Series deadbolt, this 1-inch throw passes through the strike plate hole and engages at least 1 inch into the door frame. The metal dust box anchors the strike with 3-inch screws into the frame stud, which is why kick-in attacks that defeat the bolt still fail on a correctly installed B Series with the dust box in place.

B500 vs B600: Choosing the Right Series Before Ordering Parts

B600 Series Security Features: What They Mean for Parts Ordering

The B600 Series has a longer list of anti-attack features than the B500, and several of them directly affect parts compatibility and ordering.

Hardened Steel Anti-Saw Pin

A hardened steel pin is embedded in the deadbolt bolt body perpendicular to the bolt. If someone attempts to saw through the extended bolt, the saw blade hits the hardened pin and stops. The anti-saw pin is part of the bolt assembly and is not a separately replaceable component. If the bolt shows saw damage, the entire bolt assembly must be replaced, not just the pin.

Hardened Steel Ball Bearings on Through Bolts

The through bolts that mount the lock to the door have hardened steel ball bearings embedded in the bolt body. If someone attempts to drill through the bolt to remove the mounting screws, the drill bit contacts the ball bearing and spins without penetrating. These are built into the through bolt hardware and are not separately replaceable. If a through bolt is drilled, the entire bolt set requires replacement.

Free-Spinning Cylinder Collar

The cylinder collar on the B600 exterior is broadly angled and designed to spin freely when a wrench is applied to it. A fixed collar gives a wrench purchase to torque the cylinder out of the lock body. The free-spinning collar denies that purchase and the cylinder cannot be wrenched. The collar is part of the exterior cylinder housing assembly and is finish-specific. When ordering a replacement exterior cylinder assembly for a B600, confirm both the finish code and the security level (standard Everest 29, Primus, or Primus XP) before ordering.

Steel Fire Cup Plate Insert

The fire cup plate insert adds structural strength to the lock body and enables UL listing for 3-hour fire door use as an auxiliary lock. This component is factory-installed in B600 Series locks. It is not a separately field-replaceable component. If a B600 fire-rated installation requires a replacement lock body due to damage, specify the fire-rated version when ordering to ensure UL listing compliance on the fire-door assembly is maintained.

Every Replaceable Component in the Schlage B Series Deadbolt

Tailpiece (Driver Bar): The Most Misdiagnosed Failure

The tailpiece is the flat metal bar that connects the cylinder cam and the thumb turn to the deadbolt bolt mechanism. It is the most frequently misdiagnosed failure on a Schlage B Series deadbolt, and it is also the most common source of new-installation failures that are not actually component failures at all.

Tailpiece part numbers are length-specific and cylinder configuration-specific:

Deadbolt Bolt Assembly

The B500 default bolt is part 12-288 (square corner, 1 inch by 2-1/4 inch, 1 inch housing diameter, adjustable backset 2-3/8 or 2-3/4 inch). The B600 default bolt is part 12-296 (square corner, 1-1/8 inch by 2-1/4 inch, 1 inch housing diameter, adjustable backset 2-3/8 or 2-3/4 inch). Both series offer fixed backset options at 2-3/8, 2-3/4, 3-3/4, and 5 inches in addition to the adjustable standard.

Bolt assembly replacement is needed when the bolt has sustained physical damage from a forced entry attempt, when the anti-saw pin has been encountered by a saw blade, or when the bolt mechanism binds and will not extend or retract cleanly even after lubrication. The bolt faceplate (also called the drive-in faceplate) is a separately replaceable component that covers the bolt hole on the door edge and can be replaced without replacing the full bolt assembly when only the faceplate is damaged.

Cylinder Assembly

The cylinder is the keyed component in the exterior rose that drives the cam, which drives the tailpiece, which moves the bolt. The B Series supports multiple cylinder formats at ordering time:

When replacing a B Series cylinder, confirm the security level installed before ordering. A standard Everest 29 cylinder looks physically identical to a Primus cylinder from the outside. The security level is on the original specification or on the key, which will have Primus branding on a Primus cylinder. Installing a standard cylinder to replace a Primus cylinder downgrades the security level of the opening without any visible indication that a change has been made.

Strike Plate and Metal Dust Box

The B600 standard strike is 1-1/8 inch by 2-3/4 inch with square corners. The B500 standard strike is 1-1/8 inch by 2-3/4 inch. Both are available in ANSI curved lip, round cornered, and thimble configurations for different frame preparations.

The metal dust box (part B520-283) is installed behind the strike plate. It creates a reinforced pocket in the frame for the bolt to enter, and its 3-inch screws anchor into the door frame stud rather than just the door frame face. This is what gives the B Series its resistance to kick-in attacks. The bolt itself can withstand the force. What fails on most deadbolt kick-in attacks is the door frame around the strike, not the bolt or the lock body. The metal dust box with 3-inch screws prevents frame failure by distributing the force into the stud.

Thumb Turn Assembly

The thumb turn is the interior control on a single cylinder deadbolt that allows the bolt to be thrown or retracted from the inside without a key. The thumb turn assembly includes the turn itself, the rose, and the connecting components to the bolt mechanism. On a double cylinder deadbolt, the thumb turn is replaced by an interior key cylinder and the interior rose assembly changes accordingly.

Thumb turn replacement is needed when the turn becomes stiff or will not rotate fully, when physical damage to the thumb turn has occurred, or when the connection between the turn and the bolt mechanism has worn. The thumb turn assembly is finish-specific. Always confirm the finish code before ordering a replacement.

On a correctly installed lock, the thumb turn should operate with minimal resistance in either direction. A thumb turn that requires two-hand force to operate is not a characteristic of a fully functioning deadbolt. Check for strike plate misalignment before assuming the thumb turn mechanism has failed, as binding caused by a slightly misaligned strike is often mistaken for internal mechanism failure.

Exterior Rose and Cylinder Guard

The exterior rose is the cover plate visible on the door face around the cylinder. On the B600 Series, the exterior rose houses the free-spinning cylinder collar and acts as the primary tamper-resistant interface between the exterior and the door. The exterior rose is finish-specific. Scratch or impact damage to the rose requires a finish-matched replacement. The cylinder collar is part of the exterior assembly and is not separately replaceable from the rose on most B600 configurations.

B Series Deadbolt Functions: What Each One Does

The Schlage B Series deadbolt functions determine the operating configuration and the trim components required. Ordering a replacement cylinder, tailpiece, or trim without confirming the function code produces parts that may not be compatible with the specific installation.

The B600 Indication Trim: Why It Matters for Parts

The B600 indication trim function uses a patented 180-degree viewing window that wraps three sides of the exterior rose and displays a red or white background with LOCKED or UNLOCKED messaging. The large window is readable even from across a corridor. This is the "Know It's Locked" feature Schlage markets for healthcare and education applications where knowing a room's lock status without touching the hardware is a daily operational requirement.

The indication trim is not interchangeable with standard trim. It requires a specific exterior rose assembly with the viewing window housing. When ordering a replacement rose for a B600 indication trim installation, confirm the indication function variant before ordering. A standard rose does not retrofit into an indication trim installation because the housing geometry is different.

The B600 indication trim is available with red and white messaging backgrounds for readability by color-blind individuals, and in English, French, and Spanish language versions. Always confirm the language version when ordering a replacement trim assembly for an indication function installation.

Tailpiece Orientation: The Fix Nobody Documents Clearly

The official Schlage troubleshooting guide documents a specific procedure for a newly installed B Series deadbolt that will not lock or unlock. Most other resources on the internet describe this problem as a defective lock. It is not a defective lock in the overwhelming majority of cases.

The tailpiece has an orientation that must be set correctly relative to the door for the lock to function. If installed in the wrong orientation, the key turns, the thumb turn moves, but the bolt does not extend or retract. The fix takes under two minutes.

Key-Sticking and Cylinder Failure: When to Replace vs Lubricate

A stiff key on a B Series deadbolt is one of the most common service calls. The correct response depends on how long the stiffness has been present and what lubricant history the cylinder has.

New or recent installation, key stiff immediately: Check the cylinder alignment in the rose. A slightly off-center cylinder causes the key to bind against the cylinder housing on entry. Verify the exterior rose is seated flush before assuming cylinder failure.

Key stiff after months or years of use, never lubricated: Apply graphite powder to the key blade and work it in and out of the cylinder several times. For most B Series cylinders in commercial service, graphite applied every 12 months is sufficient maintenance. Do not use WD-40 or any oil-based product.

Key stiff after months or years of use, previously lubricated with oil-based product: The pin stack has collected oil-carried debris. Graphite will not flush this out. The cylinder requires replacement. Part numbers for B600 replacement cylinders must match the security level (standard Everest 29, Primus, or Primus XP) of the original installation.

Key turns freely but bolt does not move: The tailpiece connection has failed. The key is operating the cam but the cam is no longer driving the tailpiece into the bolt mechanism. Remove the lock, inspect the tailpiece for wear or stripping, and replace with the correct length tailpiece (B202-557 for standard doors or B202-558 for thicker doors).

Key can only be removed in one position (locked or unlocked) but not the other on a new installation: Rotate the driver bar fully toward the hinges and reinstall. This is a tailpiece orientation issue identical to the general non-operating procedure above.

Strike Plate Alignment: The Most Common Source of Binding

A deadbolt that operates smoothly with the door open but feels stiff or fails to fully extend when the door is closed is almost always a strike plate alignment problem. The bolt pocket in the strike must be centered on the bolt throw for the bolt to enter cleanly and without side friction.

Door settling is the most common cause of gradual strike plate misalignment in commercial buildings. Wood frame doors settle as the building ages and the door shifts slightly in its frame. Hollow metal frame doors can shift if the frame anchoring fasteners loosen over time. Either way, the result is a bolt that contacts the edge of the strike pocket rather than entering it cleanly.

Correcting strike plate misalignment does not always require a new strike. If the misalignment is small (2mm or less), enlarging the bolt pocket with a chisel is the fastest correction. If the misalignment is larger, the strike must be relocated or a new strike installed with a bolt pocket at the corrected position.

A strike that has been in service for 10 or more years on a high-traffic exterior door may also show deformation of the bolt pocket lip where repeated bold throw impact has worn or bent the steel. A deformed strike produces a deadbolt that feels rough on every locking cycle. Replace the strike when deformation is visible.

How to Identify Your B Series Model Before Ordering Parts

Three pieces of information are required before any B Series parts order.

1. Series designation (B500 or B600): The series is stamped or labeled on the lock body, visible when the interior assembly is removed. If the label is missing or worn, the grade level can sometimes be identified by the security features: if the exterior cylinder collar spins freely when gripped and twisted, it is a B600. If it is fixed, it may be a B500 or an older B series.

2. Cylinder security level: Standard Everest 29, Primus, or Primus XP. The key itself will have Primus branding if a Primus cylinder is installed. UL 437 markings on the cylinder face confirm Primus XP. Ordering a standard cylinder to replace a Primus cylinder downgrades security without any visible indication to building management.

3. Finish code: The finish is on the original specification or visible on the hardware. Common B Series finishes include 605 (bright brass), 619 (satin nickel), 622 (matte black), 625 (bright chrome), 626 (satin chrome), and 643e (aged bronze). Trim components are finish-specific. A replacement thumb turn or rose in the wrong finish requires a return and reorder.

Browse the Schlage B Series deadbolt parts catalog at SecurityParts.com for interactive diagrams by model. For the complete Schlage commercial hardware range including ND Series cylindrical locks, L Series mortise locks, and B Series deadbolts, browse the Schlage commercial hardware catalog. Pre-order support is available at 845-935-0301 or through the contact page.

Related Parts and Products at SecurityParts.com

Schlage B Series deadbolts are typically installed alongside cylindrical locksets on the same door or in the same building. A complete commercial service call for a building's lock hardware often covers all of these at once.

For Schlage ND Series, ALX Series, and Falcon T Series cylindrical lock parts on interior corridor and office doors in the same facility, browse the cylindrical locks catalog. For Schlage L Series and Falcon MA Series mortise lock parts on high-security entry doors in the same building, browse the mortise locks catalog. For Von Duprin electric strike parts on access-controlled entries in the same facility, browse the electric strikes catalog. For Von Duprin and Falcon exit device parts on egress doors in the same building, browse the commercial exit devices catalog. For LCN door closer parts on any door with automatic closing hardware, browse the door closers catalog.

Browse the complete all products and parts catalog to source Schlage, Falcon, Von Duprin, LCN, and Detex hardware in a single session.

Mortise locks are the most complex mechanical lock type to source replacement parts for because the function code determines which components are correct, and parts across different function codes are not interchangeable even when the cases look identical. SecurityParts.com carries parts for the Schlage L Series Grade 1 (40-plus functions, 33 lever styles) and Falcon MA Series Grade 1 (high-traffic institutional, SFIC-compatible). The function code, door handing, and manufacture date are all required before ordering any chassis, armor front, latchbolt, spindle, or cylinder cam. The L9050 universal case is the single most important inventory item because it can be transformed into nine different L Series functions with the right additional parts.

Mortise locks outlast cylindrical locks by a factor of 3 to 5 in commercial service. They are on the entry doors, the main corridors, the healthcare and government facilities where reliability is not optional. When one needs service, the parts tree is deeper and more function-specific than anything in the cylindrical lock world.

The Schlage L Series alone covers more than 40 functional options, 33 lever designs, and 14 finishes. Its parts split into chassis components, cylinder components, trim components, and function-specific parts that are not interchangeable even within the same L Series family. A lever return spring for an L9010 passage function is not the same servicing need as a spindle assembly for an L9080 storeroom function. Getting any one of these wrong means a return, a reorder, and a door that stays out of service for another week. Browse the complete mortise lock parts catalog at SecurityParts.com for interactive diagrams on every function and model.

How a Mortise Lock Differs from a Cylindrical Lock

A mortise lock installs into a pocket (the mortise) cut into the edge of the door, typically 4 inches deep, 6 inches tall, and 1 inch wide. The entire lock mechanism lives inside this pocket with only the armor front plate visible on the door edge and the levers and roses visible on the door face. This concealed mounting is what gives mortise locks their tamper resistance advantage over cylindrical bore locks where the mechanism is partially exposed.

Inside the mortise case, the mechanism includes a spring latchbolt for automatic latching, an auxiliary deadlatch plunger that deadlocks the latchbolt when the door closes against the strike, a separate deadbolt on many functions, a spindle connecting the inside and outside levers through the case, and a mortise cylinder that controls the deadbolt cam. All of these operate in a single cast body. This is what makes mortise locks the strongest lock type for high-security commercial doors but also the most complex to source replacement parts for correctly.

Schlage L Series: The Commercial Benchmark Mortise Lock

The Schlage L Series has been the benchmark commercial mortise lock specification in North America for decades. Government buildings, healthcare facilities, higher education campuses, institutional projects. If a building was built to a commercial standard after 1970, there is a very high probability it has L Series locks on the entry and secured doors.

The L Series offers beyond-Grade-1 strength in a mortise chassis. The anti-saw pin in the deadbolt prevents cut-through attacks. The security blocking hub prevents lock access by removing the levers. Lock monitoring options including request to exit (RX), latchbolt monitoring (LX), door position sensor (DPS), and deadbolt monitoring (DM) are available depending on the function. The patented Everest 29 S123 keyway prevents unauthorized key duplication as standard. Primus restricted cylinders with geographic exclusivity and advanced key control are available for facilities requiring maximum key system security.

Reading the Schlage L Series Model Number

The model number decodes every specification needed to source the correct replacement parts. The format is L or LV plus function group plus deadbolt indicator plus cylinder suffix.

The Most Common Schlage L Series Functions

The L9050 Universal Case: The Most Important Inventory Item

Schlage designed the L9050 universal case to be transformed into nine different L Series functions by adding specific conversion components. This is the single most important piece of knowledge for facilities managers who maintain large L Series inventories.

A facility stocking the L9050 universal case can reconfigure it for passage, entrance/office, classroom, storeroom, and other functions using the Schlage Universal Transformation Guide (document 109436). The guide specifies exactly which additional parts are required for each function conversion. This approach eliminates the need to stock nine separate configured cases and eliminates the lead time required to order an uncommon factory-configured function combination.

The transformation requires only a few additional parts per function change, typically a chassis conversion kit and potentially trim components. The labor time is minimal for a locksmith familiar with the L Series. For facilities with 50-plus L Series locks across multiple functions, this single knowledge point eliminates thousands of dollars in stocked inventory and weeks of lead time across the building's service life.

Every Replaceable Component in the Schlage L Series

Lock Case (Chassis)

The Schlage L Series chassis (also called the lock case or case body) is the cast iron or steel housing that lives inside the mortise pocket. The chassis contains the latchbolt mechanism, the auxiliary deadlatch plunger, the deadbolt (on applicable functions), the spindle hubs, the cylinder cam track, and the internal function mechanism. The base chassis for L9050 is part L283-133. The LV-series Vandlgard chassis substitutes the standard function mechanism with the Vandlgard clutch assembly that prevents forced lever torque from engaging the deadbolt or latch.

Chassis replacement is required when the internal mechanism fails, when a function change is needed on an ND-style installation, or when the case sustains physical damage from a break-in attempt. Chassis replacement requires door disassembly, which typically means removing the levers, roses or escutcheons, through-bolts, and the case itself from the mortise pocket. Always verify the backset (2-3/4 inch standard on L Series) and door thickness accommodation before ordering a replacement case.

Latchbolt Assembly

The latchbolt is the beveled spring bolt that extends from the lock case and clicks into the strike plate when the door closes. On the Schlage L Series, the standard latchbolt is a two-piece deadlocking latchbolt with a separate auxiliary plunger alongside the main bolt. The auxiliary plunger, when depressed by the strike plate face on door closing, deadlocks the latchbolt against being retracted from the latch edge by a shimming tool or card.

The two-piece construction means the main bolt and the auxiliary plunger are separate components within the latchbolt assembly. If the auxiliary plunger fails to depress or return correctly, the deadlocking function is compromised even though the latch itself still operates normally. This is a silent failure: the door latches and appears secure but the deadlocking protection is absent. Inspect the auxiliary plunger on any L Series installation where security has been questioned, even if the latch seems to operate normally.

Armor Front (Armored Front / Scalp Plate)

The armor front is the hardened steel face plate visible on the door edge that covers the mortise case opening. It presents the latchbolt and deadbolt holes aligned with the case components below, and it resists pry, drill, and chisel attacks on the lock body. The Schlage L Series armor front is 1-1/4 inch by 8 inch and adjustable for door bevel.

Armor fronts are finish-specific and function-specific. The Schlage part 09-663 in 626 (satin chrome) finish covers the L9050, L9056, L9060, L9070, L9071, L9080, and L9082 functions. Part 09-666 covers a different configuration. Ordering an armor front without confirming the finish code and function produces a part that either does not fit or does not match the door hardware. Always pull both pieces of information from the installed hardware before ordering.

Spindle and Hub Assembly

The spindle is the square connecting rod that passes through the case and links the inside and outside levers. The hub is the internal component that connects the spindle to the case mechanism and holds the lever return springs. The lever return springs in the hub are sized to provide approximately 2 pounds of return force at the lever tip. When these springs fatigue, the lever droops below horizontal even with no other visible damage to the lock.

The Schlage L Series uses a security blocking hub that prevents gaining access to the lock mechanism by removing the levers. On locks where this is not a concern, a standard hub is fitted. Vandlgard versions use a hub with a clutch mechanism that allows the outside lever to rotate freely without engaging the mechanism when excessive torque is applied, preventing the forced-lever attack that can defeat a standard L Series lock in some configurations.

Mortise Cylinder and Cylinder Cam

The mortise cylinder screws into the case face and drives the deadbolt cam. The cylinder body is threaded at approximately 1.156 inch diameter with 32 threads per inch. Standard L Series cylinders include the Everest 29 S123 patented keyway in 6-pin conventional format. The cam is the component on the back of the cylinder that engages the deadbolt throw mechanism inside the case.

Cylinder cam replacement is one of the most frequently misunderstood service tasks on mortise locks. The cam must match both the cylinder type and the function. The Schlage L583-254 cam is used on standard conventional Schlage L Series mortise cylinders. The L583-446 cam is for Schlage modular mortise cylinders. The K510-730 cam is the standard cam for IC housings and works across Schlage IC configurations, Falcon non-deadbolt functions, and several other manufacturer applications. Using the wrong cam on a mortise cylinder produces a lock that either cannot throw the deadbolt or throws it only in one rotation direction.

Thumbturn Assembly

The thumbturn (T-turn) is the interior control that throws the deadbolt on applicable L Series functions. The Schlage part 09-509 T-turn fits doors from 1-3/8 inch to 1-7/8 inch thick with a rose diameter of approximately 1-3/4 inch. Thumbturn replacement is required when the thumbturn becomes stiff, when the internal cam connection wears and the turn no longer throws the deadbolt cleanly, or when the turn is damaged by abuse or attempted tampering. Always confirm door thickness before ordering a thumbturn replacement to ensure the correct depth is specified.

Lever Return Spring

The lever return spring (Schlage part L283-040 for the L Series) provides the return force that brings the lever back to horizontal after it is depressed. This is the highest-wear component in the L Series hub assembly and fails through fatigue on high-traffic doors. Lever sag is the primary symptom. The lever return spring is available individually and is far less expensive than replacing the full hub assembly. Replace the spring first before assuming the hub or spindle requires replacement.

Strike Plate

The L Series strike is the steel plate mortised into the door frame that receives the latchbolt and deadbolt. The standard L Series strike is a full-length plate matching the 8-inch armor front. Strike replacement is needed when the bolt pockets deform from extended high-traffic use, when the door has settled and the bolt pockets no longer align with the bolts, or when the frame is repaired and the original strike prep is modified. Always confirm whether the strike is a standard or a high-security box strike before ordering.

Falcon MA Series: The High-Traffic Value Mortise Lock

The Falcon MA Series is the Grade 1 mortise lock positioned below the Schlage L Series in price but at the same ANSI/BHMA Grade 1 certification level for both operational and security performance. It meets ANSI A156.13 Series 1000 Operational Grade 1 and Security Grade 1 with all standard trims and conventional mortise cylinders. It is UL listed for 3-hour fire doors under both UL 10B neutral pressure and UL 10C positive pressure testing, the same fire listing as the L Series.

Falcon MA Series Key Specifications

Falcon MA Series Spindle Breakaway

The Falcon MA Series uses independently mounted spindles designed to break away at a maximum of 480 inch-pounds of torque. This is the Falcon equivalent of the Schlage Vandlgard function: when someone applies excessive forced torque to the outside lever in an attempt to retract the latch or deadbolt, the spindle detaches from the chassis before that force reaches the internal mechanism. The chassis remains intact and functional. The spindle requires replacement after a breakaway event, but the chassis and all other components are preserved.

This matters for parts ordering. After a forced entry attempt on a Falcon MA Series installation where the door resisted entry, the spindle is likely broken or detached even if the door looks fine from the outside. Always check the spindle engagement when servicing an MA Series lock that has experienced a forced entry attempt. A loose or rattling lever with a firm chassis is the diagnostic sign of a broken spindle.

Falcon MA Series Cylinder Compatibility

The Falcon MA Series accepts cylinders from multiple sources. Conventional cylinders ship with the Falcon G keyway standard. SFIC (Small Format Interchangeable Core) cylinders are available in 6-pin or 7-pin configurations and accept Falcon SFIC cores as well as compatible cores from other manufacturers. Schlage Classic cylinders in C, E, and CE keyways operate the Falcon MA Series using the 5622-STD cam, which is a notable cross-brand compatibility feature that simplifies cylinder sourcing on projects where a Schlage key system is already in use.

The cylinder guard (parts A08790 and A08794) accommodates different cylinder lengths and door thicknesses. The correct cam must be specified based on the cylinder type and function. The factory supplies the correct cam when the function and door thickness are specified at order time. On field replacements, always confirm which cam is installed before ordering a replacement cylinder, as mismatching the cam to the cylinder produces a lock that operates in only one direction.

Falcon MA Series Functions

The Falcon MA Series uses a different function coding system from the Schlage L Series but covers similar ANSI function categories. Common functions include MA101 (passage), MA301 (privacy), MA381 (entrance), MA461 (classroom), and MA481 (storeroom). All function codes in the MA Series follow the pattern MA + function number + keyway/cylinder designation. When ordering replacement parts for the MA Series, confirm the MA function code from the label on the case body before selecting any chassis, latchbolt, or trim component.

Mortise Lock vs Cylindrical Lock: When Does Mortise Make Sense?

Mortise locks cost significantly more than cylindrical locks to purchase and install. They require a deeper and more complex door preparation. Parts are more function-specific and more expensive per component. Despite all of this, mortise locks are the correct specification in specific contexts where their advantages justify the cost.

Mortise locks are correctly specified on main building entries, secured office suites, healthcare patient area doors where tamper resistance is required, government facility doors, and any opening that justifies the higher purchase cost through extended service life. For interior corridor doors, storage rooms on lower-security floors, and any door where Grade 2 performance is sufficient, browse the cylindrical lock parts catalog for Schlage ALX Series or Falcon T Series alternatives that serve the application at lower cost.

How to Identify Your Mortise Lock Before Ordering Parts

The correct identification process for mortise lock parts ordering requires three pieces of information, all of which come from the installed hardware.

SecurityParts.com organizes both series in the mortise lock parts catalog by brand and series with interactive exploded diagrams on every model. For the complete Schlage hardware catalog including L Series, ND Series, and B Series deadbolts, browse the Schlage commercial hardware parts catalog. For Falcon hardware including MA Series mortise locks and T Series cylindrical locks, browse the Falcon commercial hardware parts catalog. Pre-order support is available at 845-935-0301 or through the contact page.

Related Parts and Products at SecurityParts.com

Mortise locks are part of a complete commercial door opening. The main entry door that has an L Series mortise lock also has a door closer, often an electric strike or exit device, and sometimes alarm hardware on the same opening or building.

For Schlage B Series deadbolt parts on doors that use a separate deadbolt alongside a mortise lock on a secondary opening, browse the deadbolts catalog. For Schlage ND Series, ALX Series, and Falcon T Series cylindrical lock parts on interior doors in the same facility, browse the cylindrical locks catalog. For Von Duprin electric strike parts on access-controlled entries in the same building, browse the electric strikes catalog. For Von Duprin and Falcon exit device parts on egress doors in the same facility, browse the commercial exit devices catalog. For LCN door closer parts on any door in the facility with automatic closing hardware, browse the door closers catalog.

Browse the complete all products and parts catalog to source Schlage, Falcon, Von Duprin, LCN, and Detex hardware in a single session.

SecurityParts.com carries parts for three commercial cylindrical lock series: the Schlage ND Series Grade 1 (24 mechanical functions, beyond-Grade-1 strength), the Schlage ALX Series Grade 2 (single modular chassis, field function change), and the Falcon T Series Grade 1 (extra heavy-duty, accepts any manufacturer's cylinder). The function code determines the correct chassis, spring cage, and trim components. Never order parts by appearance alone. The ND Series and ALX Series share lever styles for visual suiting but use different chassis and function kits. Parts that fail first are the spring cage, latch, and cylinder. Always confirm function code and manufacture date before ordering.

Commercial cylindrical locks are on more doors per building than any other lock category. Office corridors, storage rooms, restrooms, classrooms, patient rooms, server closets. Every one of those doors has a chassis, a latch, a spring cage, a cylinder, levers, and a strike. When one component wears or fails, replacing it correctly the first time depends entirely on having the right series and function code before you open any catalog page.

SecurityParts.com stocks parts for the three most widely installed commercial cylindrical lock series: the Schlage ND Series, the Schlage ALX Series, and the Falcon T Series. This guide covers every component, the function codes that determine which parts you need, what fails first, and how to order without a return. Browse the complete cylindrical lock parts catalog at SecurityParts.com for interactive diagrams on every model.

The Three Series at Security Parts: How They Compare

Schlage ND Series: Understanding Function Codes Before Ordering Parts

The ND Series function code is the most critical piece of information needed before any parts order. The function code determines the chassis configuration, the spring cage type, and which trim components are compatible. Ordering a spring cage or adjustment plate from the wrong function creates a non-functional lock even when the physical parts fit together.

The Most Common ND Series Functions in Commercial Buildings

Vandlgard: What It Is and Why It Matters for Parts Ordering

Vandlgard is a Schlage-patented feature that prevents forced lever torque from retracting the latch. On a standard ND Series lock, applying enough sustained downward force to the outside lever can, in some cases, retract the latch through the mechanical connection between the lever and the chassis. Vandlgard adds a clutch mechanism that breaks the lever-to-chassis connection before that force threshold is reached, while the lever can still operate normally when the door is unlocked.

Vandlgard function suffixes are ND91 (entrance/office), ND92 (entrance), ND94 (classroom), ND96 (storeroom), and ND97 (corridor). The Vandlgard function is field-selectable on the ALX Series, which means you can enable or disable it without ordering a different lock. On the ND Series, the Vandlgard feature is built into the function-specific chassis and cannot be retrofitted to a standard chassis without replacing the chassis assembly.

Most current institutional specifications for K-12, higher education, and healthcare require Vandlgard on classroom, storeroom, and secured office functions. If your building was originally specified with Vandlgard functions, all replacement parts must be sourced for the Vandlgard version of that function, not the standard version.

Every Replaceable Component in Commercial Cylindrical Locks

Chassis Assembly

The chassis is the internal mechanism housing that sits inside the door bore and contains the locking mechanism, the spindle engagement, and the spring return components. The chassis determines the function of the lock. It is not universal across functions on the ND Series. An ND50 chassis is configured differently from an ND70 or ND80 chassis, even though they look similar from the outside.

The Schlage ND Series chassis is zinc and steel with zinc dichromate plating for corrosion resistance. Door thickness accommodation is 1-3/4 inch standard with spacer kits available for 1-3/8 inch through 1-11/16 inch doors. The ALX Series uses a single chassis design that accommodates most functions, which is its key advantage for inventory management: one chassis type covers most of a building's lock schedule.

Replace the chassis when the internal mechanism fails to hold the locked state, when the spindle has developed severe play that cannot be addressed by spring cage replacement, or when a function conversion is required on the ALX Series. On the ND Series, function changes require a complete chassis replacement along with matching trim.

Spring Cage Assembly

The spring cage holds the lever in the horizontal position and provides the return force that brings the lever back after it is depressed. This is the most frequently replaced component on high-use cylindrical locks. Spring cage failure presents as lever sag, lever that does not return fully after being depressed, or a lever that rattles in the horizontal position.

Both Schlage ND and ALX Series use Grade 1 compression springs in the spring cage assembly specifically to resist lever droop under sustained use. The Falcon T Series uses a compression spring behind the cylinder that serves a similar function. When replacing a spring cage, confirm whether the outside or inside spring cage is failing before ordering. Both sides have their own spring cage assembly and they are not interchangeable with each other.

Latch Assembly

The latch is the spring-loaded bolt that extends from the door edge and clicks into the strike plate on the frame. On commercial cylindrical locks, the standard latch is a deadlatch, not a simple spring latch. A deadlatch has a plunger alongside the latch bolt that, when depressed by the strike plate on closing, prevents the latch bolt from being pushed back by a credit card or similar tool from the latch side of the door.

The Schlage ND Series default latch is part 13-247 with a 2-3/4 inch backset and 1-1/8 inch by 1-1/4 inch faceplate. The Falcon T Series default latch is part 23981145, a deadlatch with 2-3/4 inch backset and 1-1/8 inch by 2-1/4 inch square corner faceplate. Always confirm the backset (2-3/4 inch standard, 2-3/8 inch available) before ordering a latch replacement.

Latch failures on commercial cylindrical locks include the latch not retracting smoothly when the lever is depressed, the latch bolt not springing back after depression, and the deadlatch plunger binding or not depressing correctly. A latch that does not retract when the lever operates normally indicates the latch has failed, not the chassis. A latch that retracts but the lever feels stiff typically indicates the spring cage, not the latch.

Strike Plate

The standard ND Series strike is part 10-025, an ANSI curved lip strike, 1-1/4 inch by 4-7/8 inch, no box. The Falcon T Series default strike is part 5164, ANSI 1-1/4 inch by 4-7/8 inch with 1-3/16 inch lip length. The ALX Series uses the same ANSI curved lip strike as the ND Series.

Strike replacement is required when the strike is damaged by door misalignment, when the latch bolt fails to engage cleanly due to strike wear, or when a door handing change requires a different strike orientation. An ANSI box strike is used when hollow metal frame reinforcement is required. Always measure the existing frame cutout before ordering a strike replacement to confirm whether a standard or box strike fits the existing frame preparation.

Cylinders and Cylinder Formats

All three series at SecurityParts.com support multiple cylinder formats. Understanding the cylinder format installed is essential before ordering any cylinder replacement.

The Falcon T Series is specifically designed to accept cylinders from competing manufacturers including Sargent and Corbin Russwin in addition to Schlage. Some cylinders require modification of the lock for proper fit. Always specify the cylinder manufacturer when ordering a T Series with a non-standard cylinder.

Levers, Roses, and Trim

Levers on the ND Series are available in 9 designs including Athens, Rhodes, Sparta, Saturn, Broadway, Latitude, and Omega styles. The ALX Series shares these same lever designs, which is the visual suiting feature that allows mixed Grade 1/Grade 2 buildings to maintain a consistent appearance. Levers are pressure cast zinc finished to match mating parts.

The rose is the circular cover plate that conceals the chassis bore and the mounting screws on each side of the door. The ND Series rose is 3-7/16 inch standard diameter. The ALX Series rose is 3-7/16 inch standard, matching the ND Series for a seamless appearance when both are installed in the same building.

On the ALX Series, an optional break-away feature is available on Rhodes levers for most locking functions. When excessive torque is applied, the handheld portion of the lever breaks away from the shank, protecting the internal chassis from the torque damage that would otherwise require chassis replacement. This is a documented X Factor feature of the ALX Series and worth specifying on doors that receive frequent abuse.

Schlage ALX Series: The Modular Advantage and What It Means for Parts

The ALX Series modular design is the most significant feature for facilities managers and locksmiths who maintain large building inventories. A single chassis type supports most functions and all cylinder applications. This means a building can stock one chassis type and change functions in the field when a room's use changes, rather than ordering a new configured lock for every function change.

How In-Field Function Change Works

The ALX Series function is determined by a separate function kit that drops into the chassis. Changing from an ALX50 office function to an ALX70 classroom function requires the ALX70 function kit, not a new lock. The chassis stays. The lever stays. Only the function kit changes. This approach reduces inventory carrying costs, eliminates lead time waiting for factory-configured stock, and lets locksmiths carry a small number of kits on their truck rather than multiple configured lock units.

The installation sequence is designed for this: drop in the interior lever, install the function into the chassis, place the chassis in the door bore with the outside lever on the spindle, drop in the latch, drop in the cylinder or exterior function part. The separate compartment packaging keeps parts organized and prevents the small-part loss that often delays field service calls.

Captured Screws

The ALX Series uses captured screws in the latch, strike, and inside spring cage. Captured screws are retained in the component and do not fall out when the component is removed from the door. This eliminates the most common cause of rework on cylindrical lock service calls: small screws falling into wall cavities or onto floors during disassembly. On a building with dozens or hundreds of locks being serviced in a single shift, this feature has a real cumulative impact on service time.

Falcon T Series: The Multi-Cylinder Advantage and Pressure Release

The Falcon T Series occupies a distinct position in the cylindrical lock market. It is Grade 1 extra heavy-duty, designed for the highest-abuse institutional applications including government and military facilities, correctional housing, and any environment where locks receive deliberate physical attack rather than normal use.

Pressure Release Lever Rotation

The Falcon T Series includes Pressure Release lever rotation as a standard feature. When excessive torque is applied to the outside lever beyond the normal operating range, the lever rotates to a stop position that breaks the mechanical connection to the chassis rather than transmitting that force into the internal mechanism. This prevents the internal chassis damage that requires replacement after a forced entry attempt. The Pressure Release mechanism returns to normal operation after the excessive force is removed, without requiring any parts replacement, which is what makes it a standard feature rather than a consumable component.

Universal Cylinder Acceptance

The Falcon T Series is designed and marketed specifically on its ability to accept cylinders from competing manufacturers. In retrofit applications, this means a facility with an existing Corbin Russwin or Sargent key system can install T Series locks and retain their existing key system without rekeying. The T Series ships with 6-pin chambers drilled in 5-pin configuration as standard. 6-pin pinning is available at no extra cost when specified at ordering. This cylinder flexibility is the primary reason the T Series is specified on government and military retrofit projects where key system continuity is a security requirement.

Parts That Fail First: Realistic Replacement Frequency

Here is the actual field replacement order across all three series based on service call frequency.

1. Spring cage assembly. The most common replacement item on cylindrical locks with more than five years of high-traffic use. Lever sag, incomplete lever return, and lever rattle all trace to spring cage fatigue. Always try spring cage replacement before ordering a chassis.

2. Latch assembly. Latch bolts wear at the tip from repeated contact with strike plates that are slightly misaligned. The deadlatch plunger binding is a specific failure mode on latches that have been in service for more than 10 years without lubrication. Latches are inexpensive individual components and should be replaced rather than lubricated repeatedly once wear is visible on the bolt tip.

3. Cylinder. Cylinders wear from key insertion, especially in high-traffic entry doors. Signs of cylinder wear include a key that operates stiffly, a key that only works in one rotational direction, or a cylinder that spins without retracting the latch. FSIC and SFIC cylinders in interchangeable core systems can be replaced in seconds without disassembling the lock. Conventional cylinders require pulling the lock for cylinder removal.

4. Lever assembly. Levers bend, crack, or have their finish worn off from high-contact use. Lever replacement is cosmetic when the lock function is not impaired. Lever replacement is functional when a bent lever fails to return to horizontal or fails to fully depress the chassis mechanism on operation.

5. Strike plate. Strike wear accelerates when the door has settled and the latch bolt contacts the strike lip rather than entering the pocket cleanly. A worn or deformed strike allows a door that feels locked to actually be holdable open with sustained pressure. Strike replacement is inexpensive and should be done proactively when door alignment has been corrected.

How to Identify Your Lock Model Before Ordering

The model label is on the chassis body, visible when the inside lever and rose are removed. The label shows the series designation (ND Series, ALX Series, T Series), the function code (ND70, ALX50, T581), the finish code (626, 622, 619), and the handing if the lock is handed. For Schlage ND Series, the manufacture date is also on this label and is critical for selecting the correct parts revision.

If the label is worn or missing on an older ND Series unit, the function can often be determined by testing: the way the inside and outside levers behave without a key present tells you the function. A lever that is always free on one side and always locked on the other is storeroom (ND80). A lever that locks with a button from inside is entrance/office (ND50). A lever that locks from the outside with a key but the inside is always free is classroom (ND70).

For Falcon T Series locks, the model is stamped or cast into the chassis body itself. Common T Series model codes include T501 (passage), T521 (privacy), T561 (storeroom), T571 (classroom), and T581 (entrance/office).

SecurityParts.com organizes all three series in the cylindrical locks parts catalog by brand and model with interactive exploded diagrams. For Schlage commercial hardware parts including the ND Series, ALX Series, and Schlage B Series deadbolts, browse the Schlage catalog. For Falcon commercial hardware parts including the T Series and Falcon exit devices, browse the Falcon catalog. Pre-order support is available at 845-935-0301 or through the contact page.

Related Parts and Products at SecurityParts.com

Cylindrical locks are part of a complete commercial door opening. The complete assembly on most institutional doors also includes a door closer, exit device, or mortise lock at higher-security openings.

For Schlage L Series and Falcon MA Series mortise lock parts on high-security and main entry doors in the same facility, browse the mortise locks catalog. For Schlage B Series deadbolt parts on doors that use a deadbolt alongside a cylindrical lock, browse the deadbolts catalog. For LCN door closer parts on any door with automatic closing hardware, browse the door closers catalog. For Von Duprin and Falcon exit device parts on egress doors in the same building, browse the commercial exit devices catalog. For Von Duprin electric strike parts on access-controlled entries, browse the electric strikes catalog.

Browse the complete all products and parts catalog to source Schlage, Falcon, Von Duprin, LCN, and Detex in a single session.

Von Duprin electric strikes replace the fixed strike plate on a door frame and allow remote unlocking via access control. The 5100 is medium-duty, the 6100 and 6200 are heavy-duty stainless steel, and the 6300 is a fire-rated no-cut surface-mounted rim strike. Parts that fail most often are the solenoid assembly, the keeper, and the faceplate. Solenoid kits are voltage-specific: part 050237 for 12VDC, part 050240 for 24VDC. Always confirm wire color before ordering a replacement solenoid: black wires mean 24VDC, yellow wires mean 12VDC. Getting this wrong destroys the solenoid immediately.

Electric strikes are the most widely replaced access control hardware component in commercial buildings. Unlike mechanical strike plates, which are passive, an electric strike has a moving keeper, a solenoid, a spring, and electrical connections that all wear, corrode, and fail over time. The Von Duprin electric strike series is the most common in institutional and commercial buildings across North America, installed alongside Von Duprin and Falcon exit devices on virtually every category of egress door.

When one fails, you need the right part fast. A failed electric strike on a secured entry either leaves a door that cannot be locked or a door that cannot be opened from a credential. Both are problems that shut down operations. This guide covers every series, every replaceable component, the fail safe vs fail secure distinction that creates the most field confusion, and the exact diagnostic steps that identify the failed component before you order anything. Browse the complete Von Duprin electric strikes parts catalog at SecurityParts.com for model-specific diagrams on every series.

How Von Duprin Electric Strikes Work

A standard mechanical strike plate is fixed. The latch bolt from the door lock clicks into it and stays. An electric strike replaces that fixed plate with a mechanism that includes a movable keeper, called the lip or gate. When the door is closed, the keeper is rigid and holds the latch bolt securely. When an authorized credential or button press energizes the solenoid, the keeper pivots and allows the latch bolt to pass through, letting the door open without anyone touching the lock on the door.

This is the design advantage over fully electrified locksets. The mechanical lock on the door stays completely unchanged. The electric strike handles the access control function at the frame. You can retrofit access control onto existing doors with mechanical locks without replacing the lock itself, which is significantly less expensive and less invasive.

The solenoid is the electrical component that drives the keeper. When powered, it either locks or unlocks the keeper depending on the fail mode configuration. The solenoid connects to an access control panel output relay, a door release button, or a credential reader. The electrical connection is low voltage, typically 12VDC or 24VDC DC, and the wire run from the panel to the frame is carried through the wall or concealed in the frame cavity.

The Four Active Von Duprin Electric Strike Series

Fail Safe vs Fail Secure: The Most Important Decision Before You Order

This is the distinction that causes more wrong-part orders and post-installation failures on electric strikes than any other single factor. Getting it backwards means the door either cannot be secured or cannot be exited, depending on which way it is wrong.

Fail Safe (FS): Unlocks When Power is Lost

In a fail safe configuration, the strike is continuously powered to stay locked during normal operation. When power is cut, whether from a power outage, a tripped breaker, or a fire alarm activation, the solenoid releases and the keeper becomes free. The door can be pushed open without any credential. This is the required configuration for any fire-rated egress door where free exit must be maintained at all times, including during a power failure. It is also required for egress paths covered by IBC Chapter 10 where electronic locking is permitted only if the lock releases on fire alarm.

Fail Secure (FSE): Stays Locked When Power is Lost

In a fail secure configuration, the strike is energized only momentarily to unlock. During a power failure, the keeper remains rigid and the door cannot be opened without a credential. This is the correct configuration for server rooms, exterior building entries, secure storage areas, and any location where security must be maintained even during a power outage. The Von Duprin 6300 Series is fail secure only, which is required to achieve its UL 10C fire door rating.

How to Identify the Fail Mode on an Installed Strike

There is a reliable field test that works on any installed electric strike. Remove power from the strike. Try to open the door by pressing or pulling the exit device. If the door opens without power, the strike is fail safe. If the door stays locked without power, the strike is fail secure. This takes 30 seconds and eliminates any ambiguity from worn or missing labels on the hardware.

For Von Duprin 6100 and 6200 series units, the fail mode can be field-converted between fail safe and fail secure by repositioning the actuator inside the strike body without replacing the solenoid. The 050237 (12VDC) and 050240 (24VDC) solenoid kits are field-selectable between both modes. This conversion capability is one of the most valuable features of the 6000 Series and is documented in the service manual diagrams available on the SecurityParts.com model pages.

Every Replaceable Component in Von Duprin Electric Strikes

Solenoid Assembly: The Most Commonly Replaced Component

The solenoid is the electromagnetic coil that converts electrical current into the mechanical movement that drives the keeper. It is the component under the most electrical and thermal stress in normal operation and the one that fails most often in high-use installations.

Von Duprin 6000 Series solenoid kits are voltage-specific. This is the single most important detail in electric strike parts ordering.

Box Assembly

The box assembly is the metal housing that mounts in the door frame cutout and contains the solenoid, keeper spring, and electrical components. Von Duprin 6100 and 6200 series strikes use several box assembly types depending on the frame configuration and application.

Type A Box: Standard box assembly for typical hollow metal frame applications. The most common configuration.

Type B Box: Used on 6200 series mortise and cylindrical applications with specific frame geometry requirements. Type B Box images in the parts manual confirm the installation orientation.

Type C Box: Used on 6100 and 6200 series applications requiring a different frame depth. Available in DS (door status) and DS-LC (door status with latch check) versions that add monitoring capability to the box assembly without a separate monitor switch.

Offset Box: For frame applications where the standard solenoid position creates a conflict with the frame construction. The offset box repositions the solenoid 90 degrees from the standard orientation.

Faceplate Package

The faceplate is the visible plate on the frame face that covers the strike body and presents the keeper opening. Von Duprin 5100 series faceplate packages are available in three configurations.

Part 050031: Standard 4-7/8 inch faceplate package for typical commercial frame applications.

Part 050032: Round corner 4-7/8 inch faceplate for frames with rounded corners or decorative trim.

Part 050033: Long 7-11/16 inch faceplate for applications requiring extended coverage of the frame face.

Faceplate packages include the faceplate, wire nuts, and all fasteners required for installation. Always specify the finish when ordering, as faceplates are available in multiple finishes and the finish code is required for the correct part.

Keeper (Strike Lip)

The keeper, also called the strike lip or gate, is the moving component that holds the latch bolt when locked and releases when the solenoid is activated. The keeper takes direct mechanical contact from the latch bolt on every door close, which makes it a wear component on high-traffic openings. The correct keeper for each 6200 series model varies because the lip design differs between cylindrical and mortise applications. Always confirm the exact strike model when ordering a keeper replacement.

A keeper with visible wear marks, deformation, or a loose pivot shows up as inconsistent latching or a door that does not feel firmly latched even when the access control system shows it as locked. Replacing the keeper alone is significantly less expensive than replacing the full strike assembly when the box and solenoid are still functional.

Screw Package and Mounting Package

Screw Package (PKGSCR.1003 for US32D finish, PKGSCR.1004 for black finish): Includes the #10-24 5/16 inch UFPHMS, 12-24 1/2 inch UFPHMS, 12-14 1 inch UFPHWS, and blue wire nut. Required when reinstalling a strike with damaged or missing original hardware.

Mounting Package (PKGMTG.1004 for US32D, PKGMTG.1005 for black): Includes the mounting tab zinc, mounting tab shim nylon, and 10-24 1/2 inch UFPHMS. The mounting tab allows the strike to be positioned horizontally in the frame cutout for precise latch alignment.

Solenoid Washer and Solenoid Spring

Part 964037 Solenoid Washer: Seats the solenoid in the box assembly and ensures proper alignment of the plunger. A missing or damaged washer causes solenoid misalignment that results in incomplete keeper movement even when the solenoid itself is functional.

Part 968713 Solenoid Spring: Returns the plunger to its resting position after each activation cycle. Spring fatigue is a legitimate failure mode on doors that are released hundreds of times per day. Symptoms include a keeper that activates correctly but returns slowly or incompletely to the locked position, creating a security gap on fail secure applications.

The 6300 Series: What Makes It Different and When to Use It

The 6300 is the only Von Duprin electric strike that requires no frame cutting. Every other series in the Von Duprin lineup requires cutting or modifying the door frame to recess the strike body. The 6300 mounts surface on the frame stop face, which makes it the correct specification in three specific situations where no other series works.

When the 6300 Is the Right Choice

Aluminum storefront retrofit: Aluminum storefronts have thermal breaks inside the frame profile. Cutting into the frame to recess a strike destroys the thermal break and compromises the building envelope. The 6300 mounts on the frame face without cutting, preserving the thermal break.

Historic preservation projects: Frame modification is not permitted on many historic building projects. The 6300 provides electrified access control without permanent modification to the original frame.

Tenant fit-out on leased space: When a tenant cannot modify the building structure, the 6300 delivers access control capability that can be removed at lease end without leaving a frame cutout.

6300 Key Specifications

The 6300 is fail secure only. It achieves UL 10C 3-hour fire door rating in the fail secure mode. UL 1034 burglary-resistant and UL 294 access control system listed. Static strength is 1500 lbs. Dynamic strength is 70 ft-lbs. Compatible with 12VDC or 24VDC using the plug-in voltage connectors shipped with the unit. Two voltage connectors ship in the package and only the correct one for the available system voltage is used.

6300 Exit Device Compatibility

The 6300 works with a broad range of rim exit devices. Von Duprin compatibility includes the 22/22-F Rim, 33A/35A Rim, 55 Rim, 88/88-F Rim, and 98/99/98-F/99-F Rim. Falcon compatibility includes the 19/19-F Rim, 24/24-F Rim, and 25/25-F Rim. The entry buzzer accessory (part 050242, for fail secure applications) is also compatible with the 6300 and is wired in parallel with the circuit to sound an audible alert when the strike is unlocked remotely.

Troubleshooting Von Duprin Electric Strike Problems

Before ordering any replacement part, run this diagnostic sequence. Half of all reported electric strike failures are not component failures at all. They are power delivery problems, wiring issues, or latch alignment problems that require no parts whatsoever.

Entry Buzzer and AC Rectifier Accessories

Two accessories for the Von Duprin electric strike series are commonly missing from parts orders because they are rarely described in detail anywhere.

Entry Buzzer (Part 050242)

The entry buzzer is available for fail secure strike applications only. It mounts in the door frame and wires in parallel with the strike circuit. When the strike is energized to unlock (in a fail secure configuration, this is when the door is being released for entry), the buzzer sounds an audible alert to notify the person inside that someone is requesting entry. This is the standard specification for any secured entry point where the occupant should be aware of remote unlock events. The buzzer is not compatible with fail safe strikes because in fail safe, the strike is powered continuously and the buzzer would sound constantly.

AC Rectifier Kits (SO12 and SO24)

Von Duprin electric strike solenoids are DC devices. Some access control panels and power supplies output AC rather than DC. The SO12 kit converts 12VAC to 12VDC for the strike solenoid. The SO24 kit converts 24VAC to 24VDC. These kits are field-installable and plug in-line to the solenoid wiring. If a newly installed strike chatters, hums, or activates erratically despite correct voltage at the terminals, the panel may be outputting AC to a DC solenoid. The SO12 or SO24 rectifier kit is the correct fix, not a solenoid replacement.

How to Order Von Duprin Electric Strike Parts Without a Return

Three pieces of information are required before any electric strike parts order.

1. The exact series and model number. The model number is stamped or labeled on the faceplate or on the box housing. Von Duprin 4200, 5100, 6100, 6200, 6300, and 6400 series all use different part numbers for components with the same name. A solenoid kit for the 5100 series (part 050034) is completely different from the 6000 series kit (050237 or 050240). Order by series designation, not by component name.

2. The system voltage. Confirm whether the access control panel outputs 12VDC or 24VDC at the lock output. This determines whether you order the 050237 (12VDC) or 050240 (24VDC) solenoid kit. If uncertain, measure with a multimeter during an access grant signal before ordering.

3. The fail mode. Confirm fail safe or fail secure before ordering any solenoid, box assembly, or complete strike. Solenoid parts for fail safe and fail secure configurations on the same series are not always interchangeable. The 6100 and 6200 series field-selectable kits cover both modes with the same part number, but the 6300 is fail secure only and no conversion is available.

SecurityParts.com organizes the complete Von Duprin electric strikes parts catalog by series with interactive exploded diagrams. You confirm the exact component visually before ordering. Pre-order support is available at 845-935-0301 or through the contact page.

Related Parts and Products at SecurityParts.com

Von Duprin electric strikes are always part of a larger door opening assembly. The complete opening typically includes an exit device, a door closer, and sometimes a cylindrical or mortise lock on the same door.

For Von Duprin and Falcon exit device parts on the same door, browse the commercial exit devices catalog. The electric strike and exit device on a rim-style opening must be matched for latch bolt geometry and throw depth. For Von Duprin parts by series including the 98/99, 22, 33/35A, 75, 88, and Guard-X, browse the Von Duprin brand catalog. For LCN door closer parts on the same commercial door, browse the door closers catalog. For Schlage L Series and Falcon MA Series mortise lock parts on high-security doors in the same facility, browse the mortise locks catalog. For Von Duprin Guard-X and Detex exit alarm parts on secondary exits, browse the exit alarms catalog.

Browse the complete all products and parts catalog to source across all brands in a single session.

LCN door closers use a rack-and-pinion mechanism with hydraulic fluid to control closing speed. The 4040XP is the institutional flagship with cast-iron cylinder, forged steel arm, Liquid X all-weather fluid, Green Dial spring sizing (1 through 6, ships at size 3), and four adjustment valves. Arms are model-specific and not interchangeable between series. A leaking cylinder cannot be refilled in the field. If the sweep valve is fully open and the door still slams, replace the cylinder assembly. Always use the model number stamped on the body, not the body's physical appearance, to identify the correct replacement part.

LCN has manufactured commercial door closers since 1877. Walk through any school, hospital, government building, or office in North America and you will almost certainly pass an LCN closer. They are on more institutional doors than any competing brand, which also means they generate more field service calls than any competing brand.

Most of those service calls come down to the same handful of failures. Hydraulic leaks. Stripped spindles. Broken or bent arms. Valves that no longer hold their settings. Getting the right replacement part fast without a wrong-part return is what determines whether the door is back in service today or next week. This guide covers the complete LCN door closer parts catalog at the field level, starting with what actually fails and ending with how to order correctly.

How LCN Door Closers Work

Every LCN surface-mounted closer operates on the same fundamental principle: a coil spring stores energy when the door opens and releases it to close the door, while hydraulic fluid flowing through calibrated valves controls the speed of that release. Inside the cast-iron body, a rack gear acts as a piston. The pinion shaft connects the rack to the arm outside. When you open the door, the arm rotates the pinion, which drives the rack against the spring. Hydraulic fluid is displaced from one side of the rack to the other through small internal channels with adjustable valve screws.

This is the mechanism that every valve adjustment interacts with. The sweep valve controls how fast fluid moves during the main arc. The latch valve controls the final 10 to 15 degrees. The backcheck valve restricts fluid movement when the door is pushed open hard, creating resistance that protects walls and hardware. None of these valves add or remove force. They only regulate the speed of fluid transfer. If the fluid is gone, no valve setting can correct a slamming or drifting door.

LCN fills every 4040XP with Liquid X all-weather hydraulic fluid, which maintains consistent viscosity from -30 degrees F to 120 degrees F for manual closers. This temperature stability is why the 4040XP performs correctly on exterior doors and vestibules where temperature swings are significant. Standard hydraulic fluid thins in summer heat and causes uncontrolled fast closing on exterior applications.

LCN Series Carried at SecurityParts.com

SecurityParts.com stocks replacement parts and interactive diagrams for every major LCN series currently in commercial service. Understanding which series is installed is the first step before any parts order. Browse the full LCN parts catalog to navigate by series.

The LCN 4040XP: Every Component Explained

Cylinder Assembly (4040XP-3071)

The cylinder is the heart of the 4040XP. It contains the spring, rack gear, pinion shaft, bearings, and all hydraulic fluid passages. LCN uses a high-strength cast-iron body with a 1.5-inch diameter piston. The pinion shaft on the 4040XP measures 3/4 inch in diameter, which is larger than the original 4040, giving 44 percent more bearing load capacity. This enlarged shaft is the main structural improvement of the XP designation.

When the cylinder leaks, the entire assembly must be replaced. LCN does not supply rebuild seals for field refilling. Trying to top up hydraulic fluid in a leaking 4040XP body does not restore function because the seal that failed will continue to fail. The correct repair is ordering a replacement cylinder assembly (part 4040XP-3071) matched to the finish code on the existing unit.

Arm Assembly and Arm Configurations

The arm connects the closer body to the door or frame and is the component most likely to be physically damaged in service. LCN produces several arm configurations for the 4040XP. Choosing the wrong configuration for the mounting position is the most common installation error in the field.

The Green Dial Spring Power System

The LCN Green Dial is a patented visual indicator on the spring tube that shows the current spring power setting from size 1 through size 6. The 4040XP ships set to size 3, which provides adequate closing force for a standard 36-inch interior door in a regular arm configuration. Adjust with the 5/32-inch hex screw on the spring tube: clockwise increases spring power, counterclockwise decreases it.

Spring sizing is not guesswork. LCN publishes a sizing chart based on door width and mounting configuration. For interior doors up to 36 inches, size 3 is the starting point. For exterior doors from 36 to 48 inches, size 4 to 5. For exterior doors over 48 inches or high wind exposure locations, size 5 to 6. After setting the spring size, always verify ADA compliance with a calibrated force gauge. The dial setting is a starting point, not a guarantee of the actual force measured at the door face because door weight, hinge friction, weather seal drag, and threshold resistance all affect the actual opening force independently of the spring setting.

The Four Valve Adjustments

The 4040XP has four adjustment screws on the face of the closer body, labeled for identification. Each controls a different phase of the door's movement. Use a 3/32-inch hex key for the sweep and latch valves. Use the 5/32-inch hex key for the spring power screw. Turn clockwise to decrease speed (slow down), counterclockwise to increase speed.

Cover Plate (4040XP-72 and 4040XP-72-MC)

The 4040XP ships with a snap-fit non-handed plastic cover (part 4040XP-72) that protects the cylinder body and presents a clean finished appearance. The metal cover (part 4040XP-72-MC) is an optional upgrade for applications where the plastic cover is subject to physical abuse or where a more durable appearance is required. The snap-fit retention design on the current 4040XP cover is an improvement over earlier designs that required fasteners at each end.

Drop Plates and Mounting Brackets

Drop plates offset the closer body from the standard mounting position to accommodate non-standard door frame geometry, flush ceiling conditions, or narrow top rails that prevent direct mounting. LCN produces several drop plate configurations for the 4040XP. The 4040XP-18PA is the parallel arm drop plate. The 4040XP-18TJ is the top jamb push-side drop plate, which permits 120-degree maximum opening. Specifying the wrong drop plate or omitting one that is actually required causes arm binding, uneven door travel, and accelerated wear on the spindle.

Spindle and Bearing Assembly

The spindle connects the arm to the pinion shaft inside the cylinder body. The 4040XP uses full complement low-friction bearings to distribute load evenly across the full bearing race. Spindle wear produces a loose, rattling arm with noticeable play when the door is opened manually. Continuing to operate a closer with a worn spindle puts progressively increasing side load on the cylinder body, which accelerates wear and can eventually damage the housing threads. Spindle replacement is available without replacing the full cylinder assembly.

LCN Concealed Closers: 2030, 3030 and 3130 Series Parts

Concealed closers are specified when surface hardware is architecturally unacceptable. The body mounts inside the door frame transom or within the door top rail, making the hardware invisible when the door is closed. These are the closers found in hotel lobbies, high-end office building entrances, healthcare reception areas, and government buildings where the aesthetic standard prohibits visible surface hardware.

LCN 2030 / 5030 / 6030 Series

The 2030 Series is LCN's heavy-duty concealed closer for high-traffic applications. The body conceals in the frame transom and the arm track conceals in the door top rail, making all hardware invisible from both sides of the door. The 5010 variant conceals only the body in the frame while using an exposed double-lever arm. The 6030 is sized for heavy doors in demanding institutional environments. Parts include the track assembly, track roller, cylinder assembly, and mounting package. Track rollers on the 2030 series are among the most frequently replaced components because they take direct mechanical contact on every door cycle.

LCN 3030 / 3130 Series

The 3030 uses an exposed double-lever arm with the body concealed in the frame transom. The 3130 adds a concealed single-lever arm with a low-friction track and roller assembly, minimizing visible hardware even further. Both carry ANSI/BHMA A156.4 Grade 1 ratings. Parts for the 3130 include the track roller assembly (part 3130-3034H), cylinder assembly, and arm components. The track roller on the 3130 is a wear item on high-traffic doors and should be inspected during annual fire door maintenance.

LCN Sentronic Electromagnetic Hold-Open Closers

The 3130SE, 4040SE, 4310ME, and 4410ME Sentronic series integrate an electromagnetic hold-open coil that connects to the building's fire alarm system. During normal operation, the electromagnetic coil holds the door open. When the fire alarm activates, power is interrupted, the coil releases, and the spring drives the door closed. This is the correct specification under NFPA 80 Section 6.6.1 for fire and smoke barrier doors that must remain open during occupied hours but close automatically on alarm activation. Parts include the magnet assembly (SEM 7800 Series), coil components, and the closer cylinder assembly specific to each Sentronic model.

Parts That Fail First on LCN Closers: A Realistic Ranking

After 30-plus years of supplying commercial door hardware parts, we know the actual failure sequence. Here is what breaks, in the order it breaks.

1. Hydraulic cylinder seals: The most common LCN failure in the field. Oil visible on the door frame or floor confirms seal failure. The cylinder must be replaced as a unit. No field repair. No refill. Order the replacement cylinder matched to your model number and finish.

2. Arm assembly: Arms crack, bend, or strip their spindle connection on high-abuse applications. A bent arm causes uneven door travel and rapidly accelerates spindle wear in the cylinder body. Replace the arm before the cylinder sustains secondary damage. Always match the arm suffix to the exact model on the closer body.

3. Spring tension loss: After 10 or more years of continuous use in high-traffic locations, the coil spring loses tension and the door fails to latch consistently. The Green Dial can compensate for minor tension loss, but cannot overcome a spring that has lost its mechanical memory. Cylinder replacement is the correct resolution.

4. Spindle and bearing wear: Produces noticeable arm play and a loose, rattling door. Most common in correctional, healthcare, and educational environments where doors are opened hard repeatedly. Replace before the side loading damages the cylinder body threads.

5. Cover plate damage: Cracks or breaks from deliberate abuse or cart impact on corridor doors. The plastic cover (4040XP-72) is available individually. In high-abuse settings, upgrade to the metal cover (4040XP-72-MC) on replacement.

6. Drop plate and shoe fastener failure: Loose mounting screws cause arm play that looks like spindle wear. Check and tighten all mounting fasteners before ordering spindle components.

How to Identify Your LCN Closer Model Before Ordering Parts

The model number is the only reliable identifier for ordering LCN replacement parts. Physical appearance is not sufficient because multiple LCN series look nearly identical from the outside but use different internal components, different arms, and different mounting hardware.

Remove the cover plate (two fasteners at the ends of the cover on most models). The model and finish code are on a sticker attached to the cylinder body. The model number format is typically: series designation, suffix code, and finish code. For example, 4040XP-3077-689 identifies a 4040XP series with a standard regular arm and aluminum finish.

For older units where the sticker has worn off, measure the horizontal center-to-center hole distance on the closer body. LCN body sizes are standardized across production runs, and those dimensions can narrow the identification to a small number of candidates. If the body casting shows numbers like "71" or "320G," those are internal casting marks, not model numbers. They identify the production run, not the series. Always use the sticker model number for parts ordering.

LCN Door Closer Adjustment: Step-by-Step

Proper adjustment prevents the most common LCN service calls and extends cylinder life. Follow this sequence for any new installation or post-repair adjustment.

Step 1: Set All Valves to a Known Baseline

Turn all adjustment valves clockwise until they seat gently. Do not overtighten. The valve seats are brass and will strip. From fully closed, open each valve 1.5 turns counterclockwise. This is the approximate factory starting position.

Step 2: Set Spring Power with the Green Dial

Use LCN's sizing chart to determine the correct spring size for the door width, door weight, and mounting configuration. Set the Green Dial to that position. For parallel arm mounting, add one size. Check the actual opening force with a calibrated force gauge if ADA compliance is required. 5 pounds maximum is the ADA threshold for interior non-fire-rated doors.

Step 3: Set Sweep Speed

Open the door to 90 degrees and time the closing arc from 90 degrees to within 3 inches of the latch. ADA requires a minimum of 5 seconds. Adjust the sweep valve in 1/8-turn increments until the timing is correct. Test at least three consecutive closes to confirm consistency.

Step 4: Set Latch Speed

Watch the final 10 to 15 degrees before the door closes. The latch should engage cleanly with a firm click, not a slam. If the door stops short of latching, open the latch valve slightly. If it slams in the final arc, close the latch valve slightly. On fire-rated doors, positive latching on every close is a NFPA 80 compliance requirement, not a preference.

Step 5: Set Backcheck

Open the door quickly past 70 degrees and feel for resistance. Backcheck should provide a cushioning effect that prevents the door from slamming into a wall, but should not prevent full opening. If backcheck engages before 70 degrees and restricts normal door use, open the backcheck valve slightly. If there is no backcheck at all and the door swings freely to 180 degrees, close the backcheck valve clockwise until resistance is felt at 70 to 75 degrees of opening.

LCN Sentronic and Fire Door Applications

LCN Sentronic electromagnetic hold-open closers are the correct specification for any fire or smoke barrier door that must remain open during normal building operations. They are not optional convenience items. NFPA 80 Section 6.6.1 specifies that a fire door held open by any device must be connected to the building fire alarm system so it closes automatically on alarm activation.

Using a mechanical wedge, a rubber doorstop, or any manual hold-open device on a fire-rated door is a NFPA 80 violation that creates both a code compliance issue and a liability exposure. The Sentronic series eliminates this problem by integrating the hold-open function into a UL-listed fire door hardware assembly that responds automatically to the fire alarm system.

Parts for Sentronic series closers include the SEM 7800 Series magnet assemblies, the electromagnetic coil components, and the closer cylinder assembly. Browse the full door closers parts catalog for all Sentronic series diagrams and components.

Related Parts and Products at SecurityParts.com

LCN door closers are part of a complete door hardware assembly. A full service call on an institutional door typically involves the closer, the exit device, and sometimes an electric strike or lock hardware on the same opening.

For Von Duprin and Falcon exit device parts on the same door, browse the commercial exit devices catalog by brand and series. For Von Duprin electric strike parts including 5100, 6100, 6200, and 6300 series, browse the electric strikes catalog. For mortise lock parts on high-security doors in the same facility, browse the mortise locks catalog. For Von Duprin Guard-X exit alarm parts on secondary exits, browse the exit alarms catalog. For Schlage and Falcon cylindrical lock parts on interior office and corridor doors, browse the cylindrical locks catalog.

Browse the complete all products and parts catalog to source Von Duprin, LCN, Schlage, Falcon, and Detex in a single session, or reach the team at 845-935-0301 for pre-order compatibility support.

The Von Duprin 98/99 series is on more institutional doors than any other exit device in North America. Schools, hospitals, government buildings, universities, airports. If you manage a commercial facility or work as a locksmith, you will service this device more than any other in the Von Duprin lineup.

This guide covers everything you need to work on 98/99 series exit device parts efficiently. It covers the configurations, the parts that fail, the dogging details that trip people up, the electrified options, and exactly how to order the right component without a return. Browse the full Von Duprin parts catalog at SecurityParts.com for model-specific diagrams on every series.

What Makes the 98/99 Series Different From Other Von Duprin Devices

The 98/99 sits at the top of the Von Duprin lineup. It is the deepest specification in terms of electrified options, the most configurable in terms of device type, and the only Von Duprin series that carries full Made in USA production. ANSI/BHMA A156.3 Grade 1 certification means it is tested to the highest cycle and force standards in the exit device category.

The case distinction is simple: the 98 series has a smooth mechanism case and the 99 series has a grooved case. Both are mechanically identical. The grooved case on the 99 gives a better grip surface under repeated push pad contact, which is why healthcare and institutional specifications often call for the 99 specifically.

The forward compatibility advantage is what separates the 98/99 from every other series. A mechanical device installed today can be converted to QEL quiet electric latch retraction, MEL motorized retraction, Chexit delayed egress, Allegion Connect, or other access control options years later without replacing the device body. Facilities managers doing phased access control upgrades depend on this.

98/99 Series Configurations: Which One Fits Your Door

Rim Device (98, 99, F-98, F-99)

The rim device mounts on the door face and latches at a single frame-side strike. Standard for single doors and paired doors with a center mullion. The F-prefix versions (F-98, F-99) are fire exit hardware with a UL fire listing. They must positively latch on every door close and do not support hex dogging. The standard 98/99 (without F-prefix) is panic exit hardware that supports mechanical dogging on non-fire-rated doors.

Surface Vertical Rod (9827, 9927)

SVR devices add top and bottom engagement rods running on the door face, providing three-point locking for double door openings without a center mullion. The 9827 is the 98 series SVR and the 9927 is the 99 series SVR. Both use a dedicated center case (part 109358) which is different from the rim device center case (part 109012). These are not interchangeable. Confirm configuration before ordering any center case.

Concealed Vertical Rod (9847, 9947)

CVR devices route the rod hardware inside the door for architectural applications where surface rods are not acceptable. Hotel lobbies, healthcare reception areas, high-end commercial interiors. CVR parts must match the exact model and door prep. CVR installation is typically done at the factory; field replacement of internal rod components requires door removal in most cases.

Wide Door Cable (WDC)

The WDC configuration uses a cable rather than rigid rods for very wide double doors where rod flex would be a problem. Available on the 98/99 series for oversized openings.

Mortise Device (98/9975, XP98/XP99)

The mortise configuration integrates the 7500 mortise lock body into the panic device chassis for maximum security depth alongside code-compliant egress. The 7500 mortise lock body has been in service since approximately 1977. Browse mortise lock replacement parts for the 7500 body components that pair with the 98/9975 mortise exit device.

Panic vs Fire Exit Hardware on the 98/99 Series

Every 98/99 series device is available in both standard panic and fire exit hardware versions. Getting this wrong before ordering replacement parts is the most common mistake in 98/99 series maintenance.

Standard panic devices (98, 99, 9827, 9927): UL listed for panic exit applications. Support mechanical hex dogging. Channel cover plates specific to panic configuration.

Fire exit hardware (F-98, F-99, F-9827, F-9927): UL listed for fire exit hardware. The F-prefix in the model number confirms this. Must positively latch on every door close. Hex dogging is not permitted. Channel cover plates carry different part numbers from the panic versions.

Dogging on the 98/99 Series

Hex dogging holds the push pad depressed during business hours so the door operates as a push/pull entry without latching. Standard on all panic-rated 98/99 devices. Not available on F-series fire exit hardware.

Why Dogging Fails on the 98/99

The dogging shaft hole (part 090040) is approximately 1/4 inch deep. The most common cause of dogging failure in the field is using a short 5/32-inch hex key that does not reach full depth. Short keys round out the hex engagement point over repeated use, requiring shaft replacement. Always use the long version of the 5/32-inch hex key and seat it fully before rotating.

The dogging assembly has three components:

090040 Dogging Shaft: The piece the hex key engages. Field note: the pre-1998 shaft has a different profile. For devices manufactured before 1998, use part 050709 conversion kit.

090042 Dogging Adapter Spring: Locks the adapter into the mounting bracket.

090043 Dogging Adapter: The housing the shaft and spring fit through.

Parts That Fail First on the 98/99 Series

Based on actual field replacement frequency, here is a realistic sequence of what wears out first:

1. Dogging assembly: The most common maintenance item on high-traffic doors. Shaft strips, springs fatigue, adapters crack. All three components are available individually.

2. End cap and bracket: The plastic end cap on the hinge side of the device breaks under repeated contact. When it breaks, the dogging cover plate slides off. Von Duprin introduced the 900397 metal end cap kit in 2016 to replace the historically fragile plastic version. This is a worthwhile proactive upgrade on any high-use 98/99 device.

3. Push bar retrofit kit: The push bar assembly bends or deforms on high-abuse applications. Push bar retrofit kits are available for 3-foot and 4-foot door widths, replacing just the push bar without requiring a full device swap.

4. Center case: The center case (109012 for rim, 109358 for SVR) wears after decades of continuous use. The 109012 rim center case has been in production for approximately 40 years and replaces all non-fire-rated 98/99 rim center cases with backward compatibility to devices installed in the 1980s. This long backward compatibility chain is one of the most valuable maintenance advantages of the 98/99 series.

5. Latch return spring (090039): Used in the push bar assembly to return the latch. Fails from spring fatigue on very high-cycle doors.

Electrified Options on the 98/99 Series

The 98/99 series has the deepest electrified options catalog of any Von Duprin device. Each option converts or adds to the mechanical device without replacing the body.

QEL: Quiet Electric Latch Retraction

The QEL is a modular field-installable kit that adds electric latch retraction to a mechanical 98/99 device. When an authorized credential is presented, the latch retracts silently. This is the most commonly specified electrified conversion on existing 98/99 devices in phased access control upgrades. The HD-QEL variant adds hex dogging capability to the electrified device.

MEL: Motorized Electric Latch Retraction

Motor-driven latch retraction for applications where solenoid noise is not acceptable. Quieter operation than standard EL. Used in library environments, healthcare patient areas, and quiet office zones.

Chexit: Delayed Egress

Holds the door latched for 15 seconds after the push bar is activated, with a local alarm sounding during the delay. NFPA 101 compliant for controlled egress applications. Used in retail, psychiatric facilities, and any location where unauthorized egress must be deterred without blocking emergency egress.

RX: Request to Exit

A switch placed in the push bar that signals the access control panel when the bar is pressed. Notifies the system of an authorized egress event to prevent false alarms on the secured entry side. Standard on any 98/99 device integrated into an access control system where the door also serves as a secured entry. The electric strikes parts catalog covers the Von Duprin electric strikes on the frame side that work alongside RX-equipped exit devices.

LX: Latch Bolt Monitoring

Monitors the position of the latch bolt, signaling the access panel when the door is not properly latched. Used on fire doors and secured doors where latch compliance monitoring is required by the inspection program.

ALK: Alarm Exit Kit

Converts the 98/99 to an alarmed exit device. Powered by a 9-volt battery. Controlled by a mortise cylinder (not included). When the push bar is pressed, the 85-decibel alarm sounds. The ALK is shared across the 22, 33A, 35A, 98, and 99 series.

CON: Allegion Connect

Wireless integration into the Allegion Connect ecosystem for remote monitoring and control.

How to Order 98/99 Series Parts Without a Wrong-Part Return

Three pieces of information are required before placing any 98/99 series parts order.

1. Confirm the configuration: Rim or SVR changes the center case part number entirely (109012 vs 109358). CVR and mortise use model-specific parts. Confirm which configuration is on the door before opening any catalog page.

2. Check the manufacture date: The manufacture date is stamped near the mechanism housing on the device body. Devices manufactured before 1998 use old-style dogging assemblies. The conversion kit (part 050709) updates pre-1998 devices to current spec dogging components. Post-1998 devices use parts 090040, 090042, and 090043.

3. Confirm panic or fire exit hardware: The F-prefix in the model number confirms fire exit hardware. Channel cover plates, dogging kits, and some trim components carry different part numbers between panic and fire configurations. Never order channel cover plates without confirming first.

SecurityParts.com organizes the complete Von Duprin 98/99 series parts catalog by model with interactive exploded diagrams on every model page. You confirm the component visually before ordering. Pre-order compatibility support is available at 845-935-0301 or through the contact page.

Related Parts at SecurityParts.com

The 98/99 series operates as part of a complete door assembly. A full service call on an institutional door typically covers the exit device, the door closer, and sometimes an electric strike or lock hardware on the same opening.

For LCN door closer parts on the same opening, browse the door closers catalog by series. For Von Duprin electric strike parts, including 5100, 6100, 6200, and 6300 series, used on the frame side alongside 98/99 exit devices, browse the electric strikes catalog. For Von Duprin Guard-X exit alarm parts on secondary exits in the same building, browse the exit alarms catalog. For Schlage deadbolt parts on interior office doors in the same facility, browse the deadbolts catalog.

Browse all Von Duprin series: 22, 33A, 75, 88, 94/95, and the Guard-X, in the Von Duprin parts catalog, or explore the full commercial exit devices parts catalog to navigate by brand and series.

Frequently Asked Questions

If you're buying door hardware for a commercial project, you'll run into this choice pretty quickly: mortise lock or cylindrical lock? They both secure a door. They both come in Grade 1. But they work differently, install differently, and belong on different types of openings.

Security Parts carries parts for all three Falcon exit device series. The 19 Series is narrow stile, light-to-medium duty, rim and SVR only. The 24 Series is narrow stile, heavy duty, for aluminum storefront doors with stiles as narrow as 1-3/4 inches. The 25 Series is wide stile, heavy duty, for standard hollow metal and wood commercial doors. The 24 and 25 Series share a push pad design and the same service manual (108004). The most frequently replaced parts are the channel, end cap kit, dogging cover plate, and on electrified versions, the EL solenoid or HWEA alarm board. For pre-June 2012 alarm assemblies, the HWEA replacement board is part 650335.

Falcon exit devices are on more commercial egress doors in North America than any other panic hardware brand outside Von Duprin. The 19, 24, and 25 Series cover the full range of commercial applications: from light office and retail doors through aluminum storefront entries to institutional hollow metal fire-rated assemblies. Each series has distinct construction, stile requirements, and electrified option sets. Getting the right replacement part requires knowing which series is installed and which sub-configuration applies.

Browse the complete Falcon exit device parts catalog at SecurityParts.com, which includes the 19, 24, and 25 Series alongside the full Von Duprin and Detex exit device range. The Falcon hardware catalog covers all Falcon product lines including exit devices, mortise locks, and cylindrical locks.

Falcon 19 vs 24 vs 25 Series: Which One Is Installed

Before ordering any replacement part, identifying the series is mandatory. The three series look similar from a distance but are built for completely different door constructions. Ordering a 25 Series end cap for a 24 Series device, for example, produces a part that will not fit.

What Exit Device Configurations Mean for Parts Ordering

Each series offers multiple configurations that determine which latch hardware, rods, and strikes are involved. The configuration suffix on the model number tells you what is installed.

Why the Rim vs Vertical Rod Distinction Matters for Parts

A rim device has one latch point at the device head and uses a single rim strike on the door frame. A surface vertical rod device adds a bottom rod running from the device head to a floor bolt, creating two-point latching. The bottom rod, floor strike, and bottom latch components are additional parts unique to vertical rod configurations that rim devices do not use. If you are ordering a strike or latch bolt replacement, you need to know whether the installation is rim or VR before ordering.

The 25-V surface vertical rod uses a 3788 surface-applied top strike and a 2130 mortised bottom floor strike as the standard configuration. The 25-C concealed VR uses a 4188 mortised top strike and 2130 bottom standard, with 4155 and 2126A as bottom options. Fire-rated 25-C uses strike 1279 standard and F1280 for B label applications.

Falcon 19 Series Parts: Channels, End Caps and Key Components

The 19 Series uses a narrower channel profile than the 24 and 25 Series. All mounting screws are concealed; latch fasteners are exposed to the egress side. The push bar height is 1-3/4 inches. The stainless steel latch bolt has a 3/4-inch throw with deadlocking standard.

Falcon 24 Series Parts: Heavy Duty Narrow Stile

The 24 Series is built from extruded aluminum for maximum strength on narrow stile aluminum storefront doors. The construction provides greater impact resistance than the 19 Series at the same stile width. The push pad design is shared with the 25 Series, which is why both reference the same service manual 108004.

The 24 Series Door Thickness and End Cap Selection

The 24 Series serves aluminum storefront doors that come in two standard thicknesses: 1-3/4 inches (the most common commercial aluminum frame door) and 2-1/2 inches (thicker commercial storefront systems). The end cap kit part number changes based on this dimension. Part 650294 is for the 1-3/4-inch door and part 650348 is for the 2-1/2-inch door. Ordering the wrong kit produces an end cap that either leaves a gap at the stile edge or cannot seat against the door face at the correct depth.

Falcon 25 Series Parts: Wide Stile Heavy Duty

The 25 Series is Falcon's flagship exit device for standard commercial hollow metal and wood door applications. The center case is heavy wrought with sintered metal parts throughout the mechanism, making it more durable than extruded-only construction under heavy cycle loads. The top latchbolt is stainless steel with a 3/4-inch throw and deadlocking standard. Vertical rod configurations add a bottom bolt with a 1/2-inch throw.

25 Series Dogging: Half-Turn Hex, No Threads

Half-turn hex dogging is standard on the 25 Series with no threaded dogging components anywhere in the mechanism. Traditional threaded dogging on older exit devices requires turning a threaded rod several rotations, and the threads strip or corrode over time on high-cycle doors. The Falcon 25 Series half-turn hex design eliminates all threaded components from the dogging path. One half turn clockwise dogs the device. One half turn counterclockwise releases it. No stripping. No galling. This is why the 25 Series dogging mechanism outlasts competitor devices significantly on doors dogged and released multiple times daily.

Cylinder dogging is available as an option on the 25 Series using a 1-1/8-inch mortise cylinder with standard cam. This allows the outside cylinder to dog and release the device without carrying the hex key, which is the preferred configuration for reception desks and service counters where maintenance staff routinely dog the door at opening time.

25 Series Configurations and Stile Requirements

Stile requirements vary by 25 Series configuration. Standard 25-R and 25-V configurations require a 4-1/2-inch minimum stile. The 25-C concealed vertical rod configuration requires a 3-1/2-inch minimum stile on panic versions and 4-1/2-inch minimum on fire-rated F-25-C installations. The 25-CWDC (wood door wide cable configuration) requires a 6-1/2-inch minimum stile on wood doors. Ordering a 25-V or 25-C for a door with an undersized stile produces a device that cannot be correctly mounted.

25 Series Fire Ratings: A Label vs B Label

The Falcon 25 Series supports two UL fire ratings depending on the configuration. The B label (1-1/2 hour) is available on all 25 Series configurations. The A label (3-hour) is available on fire pairs (F-25-M x F-25-V or F-25-C), permitting up to 4-foot by 10-foot single doors and 8-foot by 10-foot pairs. When ordering strike replacements for fire-rated 25 Series installations, the fire strike specification matters. The F-25-C uses strike 1279 as standard and F1280 for B label applications. The F-25-V uses strike 299F for fire-rated top and 499F for fire-rated pairs with mullion.

Hex Dogging: How It Works and What Fails

Dogging is the function that holds the push bar depressed and the latch retracted, allowing the door to operate as a free-swinging door without requiring the push bar to be pressed on every pass. It is standard on the 24 and 25 Series panic versions and on the 19 Series panic version. It is never available on any fire-rated version of any series because holding a fire door latch retracted violates life safety code.

Hex dogging uses a hex key (Allen wrench) inserted into the dogging hole in the channel. On the Falcon 24 and 25 Series, the half-turn mechanism requires only a 180-degree rotation. The dogging cover plate conceals the dogging hole when not in use. This cover plate is a separately replaceable component if it is damaged or missing.

Electrified Options on the Falcon 24 and 25 Series

The Falcon 24 and 25 Series support a full range of electrified options for access control integration. Understanding the compatibility rules between these options prevents ordering combinations that cannot be installed together.

EL: Electric Latch Retraction

The EL option retracts the latch electrically without depressing the push bar, allowing the door to be opened from the outside by a credential reader, keypad, or building automation system. The EL solenoid operates at 24V DC and 0.34 amperes continuous duty. For 3-foot devices, the EL kit is part 650147. For 4-foot devices, it is part 650148. EL can be combined with FSA/FSE (fail safe/fail secure outside trim), DM (device monitoring), LM (latch monitoring), and AE/LK options. EL cannot be combined with ED (electric dogging), EA (exit alarm), HWEA (hard-wired exit alarm), or KOR (key override) on the same device.

Electric latch retraction serves two common use cases in commercial buildings. The first is controlled entry: a credential reader on the exterior side triggers the EL solenoid to retract the latch, allowing entry without pushing the panic bar. The second is electronic dogging during business hours: the building automation system energizes the EL solenoid for extended periods to hold the latch retracted as an alternative to mechanical hex dogging. This allows the door to operate in free-swing mode during hours and automatically re-latch when the solenoid is de-energized after hours.

EA and HWEA: Exit Alarm Options

The EA (exit alarm) option adds an audible alarm triggered when the push bar is pressed, providing delay notification or unauthorized egress alerting. The HWEA (hard-wired exit alarm) version connects to a building's wired fire alarm or security system.

The alarm circuit board replacement for pre-June 2012 HWEA assemblies is part 650335. This date boundary is critical: the alarm assembly design changed in June 2012. The 650335 board works only on pre-June 2012 assemblies. Post-June 2012 assemblies use a different alarm kit. Confirming the manufacturing date before ordering any alarm board replacement prevents a non-functional alarm installation.

KOR, LM, DM, RX: Monitoring and Override Options

KOR (key override) provides a cylinder that overrides the electrified outside trim functions without requiring electronic credentials. It is used when power failures need a mechanical fallback for authorized entry. LM (latch monitoring switch) monitors the latch bolt position and reports door open/closed status to the access control system. DM (device monitoring switch) monitors whether the push bar has been pressed. These two cannot be used on the same device because their switch mechanisms conflict. RX (request to exit switch) connects to an egress-side reader or motion sensor to signal the access control system that someone is approaching from the inside before the door opens.

How to Identify the Correct Part Before Ordering

Three pieces of information are needed before any Falcon exit device parts order.

1. Series (19, 24, or 25): Determined by the door construction and stile width as described above. The series number is typically visible on a label on the device channel or center case.

2. Configuration (R, V, C, CWDC, M): Visible from the door face. A rim device has a single latch point and no visible rod hardware on the door. A surface VR device has a visible bottom rod running down the door face to a floor strike. A concealed VR device has no visible rod hardware but two latch points (the concealed rods are inside the door stile).

3. Panic or fire-rated (prefix F-): Look for a fire label on the door or door frame. If a fire label is present, the device should be a fire-rated version. If ordering a replacement device, always match the fire rating of the original. If ordering a dogging cover plate, panic devices have a dogging hole; fire-rated devices do not.

Browse the exit device parts catalog at SecurityParts.com for all Falcon 19, 24, and 25 Series components with interactive diagrams. The Falcon hardware catalog covers exit devices alongside Falcon MA Series mortise locks and T Series cylindrical locks. Pre-order support is available at 845-935-0301 or through the contact page.