Trusted Since 2001
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
B500 Series
7 functions. Optional fire rating with fire-rated deadbolt version. Optional indicator trim for status visibility. Adjustable backset (2-3/8 or 2-3/4 inch). Default deadbolt part 12-288 (square corner, 1 inch x 2-1/4 inch, 1 inch housing diameter). Standard door thickness 1-3/8 to 2-1/4 inch. Available in conventional, FSIC, and SFIC cylinder formats. Commercial 3-year limited warranty.
B600 Series
Schlage's strongest commercial deadbolt. Hardened steel anti-saw pin in bolt. Hardened steel ball bearings stop drilling on through bolts. Free-spinning cylinder collar resists wrenching. Removeable security shield protects cylinder driver. Steel fire cup plate insert for UL 3-hour fire door listing. Default deadbolt part 12-296 (square corner, 1-1/8 x 2-1/4 inch). Default Everest 29 S123 keyway. Incorporates former B700 and B800 Primus-level series.
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:
| Part Number | Description | Length | Application |
|---|---|---|---|
| B202-557 | Standard tailpiece, single cylinder | 1.85 inch | Standard 1-3/4 inch door, single cylinder B Series |
| B202-558 | Longer tailpiece, single cylinder | 2.00 inch | Thicker doors where standard tailpiece doesn't reach |
| B220-032 | Tailpiece, double cylinder | 1.031 inch | B100, B250, B400, H, MD, and S200 series double cylinder |
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:
| Cylinder Format | Code | Description | Application |
|---|---|---|---|
| Conventional | Standard | Standard pinned cylinder, Everest 29 S123 keyway default | Most commercial installations |
| Primus | P | Second set of pins plus geographic exclusivity | Government, healthcare, high-security commercial |
| Primus XP | XP | UL 437 listed. Resists drilling and physical cylinder attack | High-security exterior doors, correctional facilities |
| FSIC | IC | Full-size interchangeable core. Core removeable by control key | Large campuses requiring frequent rekeying |
| SFIC | SFIC | Small format interchangeable core | Facilities with existing SFIC key systems |
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.
| Function | Series | Operation | Application |
|---|---|---|---|
| Single cylinder (B60N, B600 single) | B500, B600 | Key exterior, thumb turn interior | Standard commercial and residential door |
| Double cylinder (B62N, B600 double) | B500, B600 | Key both sides, no thumb turn | Doors with glass adjacent to lock where thumb turn would allow glass-break access |
| Privacy (B571, B600 privacy) | B600 | Key exterior, interior indicator and coin turn, 180-degree window indicator | Restroom stalls, utility closets requiring occupied/vacant indication |
| Indicator (B571, B600 indication) | B600 | 180-degree status window, visible LOCKED/UNLOCKED from corridor | Healthcare patient rooms, offices where occupancy status must be visible from corridor |
| Key outside only (B600 key outside) | B600 | Key exterior only, interior lever retracts bolt | Storerooms where interior free egress is required |
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.
Remove the Lock from the Door
Unscrew the mounting screws holding the interior assembly to the exterior. Separate the two halves of the lock from the door bore. Do not disassemble the lock itself.
Rotate the Driver Bar Fully Toward the Hinges
With the lock removed, rotate the driver bar (tailpiece) fully in the direction of the door hinges. This resets the orientation to the correct starting position. Verify the deadbolt is fully retracted before reinstalling.
Reinstall with Key Removed and Bolt Retracted
Reinstall the lock with the deadbolt in the fully retracted position and with no key in the exterior cylinder. The key being in the cylinder during installation can shift the tailpiece orientation during the reinstallation process. Insert the key only after the lock is fully reinstalled and test operation.
Test Both Directions from Both Sides
Test with the exterior key in both locking and unlocking directions. Test with the interior thumb turn in both directions. If the lock now operates correctly, the issue was orientation only. No parts are needed. If the lock still does not operate after correct orientation, the tailpiece itself may be worn or stripped and requires replacement.
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.
Why Choose SecurityParts.com for Schlage B Series Deadbolt Parts
Tailpiece guidance, cylinder security level documentation, dust box importance, and same-day shipping on stocked parts.
Tailpiece Orientation Guidance
We document the driver bar rotation fix that resolves most new installation failures without any parts replacement. Knowing this before calling in a service order saves time and unnecessary returns.
Cylinder Security Level
We document that standard and Primus cylinders look identical from outside. Replacing a Primus with standard downgrades security silently. We confirm the security level before the order ships.
Dust Box Documentation
We explain why the metal dust box with 3-inch screws is the most cost-effective security upgrade per opening. Most facilities don't know it was omitted until after a kick-in incident.
Same-Day Shipping
Most B Series parts ship same day from US warehouses. Call 845-935-0301 or use the contact page for pre-order compatibility support.
What Makes SecurityParts.com Different for Schlage Deadbolt Parts
- We document the tailpiece orientation procedure that resolves most new installation failures without ordering any parts. No other parts supplier explains this in buyer-facing content, which means unnecessary part orders happen constantly.
- We explain that B700 and B800 Series locks are now incorporated into B600 Series with Primus cylinder specifications. Facilities maintaining these older specifications can order confidently without confusion about what has changed.
- We document the metal dust box importance as the most cost-effective physical security upgrade per deadbolt opening. The 3-inch screws that anchor into the stud are the difference between a door that fails a kick-in and one that holds.
- We document the oil lubricant contamination failure mode. Cylinders lubricated with WD-40 or similar products need replacement, not additional lubrication. This prevents repeated unnecessary service calls on the same cylinder.
- We carry Schlage B Series parts alongside Schlage ND and ALX Series cylindrical lock parts, Schlage L Series mortise lock parts, and LCN door closer parts. One order services the complete building opening.
- Same-day shipping from US warehouses on stocked parts. Free shipping on orders over $450.
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.
Frequently Asked Questions About Schlage B Series Deadbolt Parts
What is the difference between the Schlage B500 and B600 Series deadbolts?
The B500 is Grade 2 for lighter commercial and multi-family applications with 7 functions and an optional fire rating. The B600 is Grade 1 with hardened steel anti-saw pins, ball bearings to stop drilling on through bolts, a free-spinning cylinder collar to resist wrenching, a security shield against cylinder manipulation, and a steel fire cup plate insert for UL 3-hour fire door listing. The former B700 and B800 Series names are now incorporated into B600 with Primus cylinder specifications.
What is the tailpiece on a Schlage B Series deadbolt and how do I replace it?
The tailpiece (driver bar) connects the cylinder cam and thumb turn to the deadbolt bolt mechanism. Standard single cylinder tailpiece is part B202-557 (1.85 inch). Longer single cylinder tailpiece is B202-558 (2 inch). Double cylinder tailpiece is B220-032 (1.031 inch). If a new installation won't lock, rotate the driver bar fully toward the hinges before reinstalling. If the key turns but the bolt doesn't move after correct orientation, the tailpiece is stripped and requires replacement.
What keyway does the Schlage B600 Series use by default?
The B600 Series uses the Everest 29 S123 patented keyway as standard. This prevents unauthorized key duplication. The B600 is upgradable to Primus for geographic exclusivity and a second pin set, and to Primus XP for UL 437 high-security listing. The B700 and B800 Series names previously identified Primus levels and are now B600 variants.
What causes a Schlage deadbolt to not lock or unlock after installation?
The most common cause on new installations is incorrect tailpiece orientation. Remove the lock, rotate the driver bar fully toward the hinges, and reinstall with the bolt retracted and key removed. If the bolt operates with door open but binds when closed, the strike plate is misaligned. If the key turns but the bolt doesn't move, the tailpiece has failed and needs replacement. A key that sticks after extended use requires cylinder replacement.
What strike plate does the Schlage B600 Series use?
The B600 standard strike is 1-1/8 inch by 2-3/4 inch with square corners. The metal dust box (part B520-283) installs behind the strike using 3-inch screws that anchor into the door frame stud. This is the critical component that prevents kick-in failures. Many B Series installations are missing the dust box, making this the most cost-effective physical security upgrade available per opening.
What is the Schlage B Series single cylinder vs double cylinder deadbolt?
Single cylinder (B60N, B600 single) uses a key exterior and thumb turn interior. Double cylinder (B62N, B600 double) requires a key on both sides. Double cylinder is specified on doors with glass near the deadbolt where someone could break the glass and reach a thumb turn. Many building codes prohibit double cylinder deadbolts on required egress doors because they delay exit during emergencies. Always verify local code before specifying double cylinder on any egress path.