Walk through any hospital, school, office complex, or retail building in America, and you will find exit devices on almost every fire-rated and high-traffic door. These are the horizontal push bars, touchpads, and crossbars that allow occupants to exit quickly under normal conditions and evacuate safely during emergencies. They are some of the most-used pieces of hardware in any commercial building, which is exactly why their parts wear out.

The problem most facility managers and contractors run into is not that exit device parts are hard to find. It is that these parts are hard to identify. Without knowing the exact device type, series, and component name, ordering a replacement becomes guesswork. Order the wrong part and you lose days to a return and reorder. Leave a malfunctioning device in place and you create a liability.

This guide walks you through the main types of commercial exit devices, the key parts that make each one work, what wears out most often, and how to identify and order the right replacement components the first time.

What Are Commercial Exit Devices and Why Do Parts Matter?

Commercial exit devices, also called panic bars or panic hardware, are door hardware assemblies designed to allow fast, one-handed egress from a building. Building codes in the United States, including the International Building Code (IBC) and NFPA 80 fire door standards, require exit devices on most fire-rated commercial doors and assembly occupancies.

Unlike residential door hardware, commercial exit devices operate under continuous, high-frequency stress. A busy school hallway door may cycle through several hundred latching and unlatching operations every single day. Under that kind of use, internal components - springs, latch mechanisms, dogging assemblies, and end caps - eventually wear down. When they do, the whole device suffers: doors fail to latch properly, panic bars go limp, and fire-rated openings fall out of compliance.

Replacing an entire exit device assembly can cost hundreds to over a thousand dollars depending on the model, function, and trim. Replacing a specific worn part costs a fraction of that. This is why knowing your exit device's parts and understanding which component is failing gives you a significant cost and time advantage.

The Three Main Types of Commercial Exit Devices

Exit devices come in three primary configurations. Each serves different door and frame situations, and each has a distinct parts layout.

1. Rim Exit Devices

Rim exit devices are the most common type in commercial buildings. The entire mechanism mounts directly to the surface of the door, and the latch extends horizontally to engage a rim strike installed on the door frame or mullion. They work on single doors and are typically the easiest to maintain.

Common rim exit device parts include the touchbar or crossbar assembly, the latch case (also called the mechanism case), the rim latch bolt, the rim strike, the dogging mechanism and dogging key, the end cap, the case cover and cover plate, and mounting screws and sex bolts.

Von Duprin's 98/99 Series, 22 Series, 55 Series, and 88 Series are among the most widely installed rim exit devices in North American commercial buildings. The 98/99 Series is particularly common in high-security and institutional applications.

2. Surface Vertical Rod Exit Devices

Surface vertical rod (SVR) exit devices use exposed vertical rods that run along the face of the door. When the touchbar is depressed, both rods retract simultaneously - one into the top frame and one into the floor strike. This provides a more secure, multi-point latching system than rim devices and is preferred on double doors where no center mullion is present.

Key parts unique to SVR devices include the top and bottom vertical rods, the top and bottom rod strikes (overhead and floor), the latch case with rod connector hardware, and the rod adjustment hardware. The floor strike is a known wear point because it absorbs the impact of the bottom rod on every cycle.

Von Duprin's 33/35A Series and 94/95 Series are widely installed SVR exit devices. The 94/95 Series includes three-point latching and is common in higher-security commercial applications.

3. Concealed Vertical Rod Exit Devices

Concealed vertical rod (CVR) exit devices hide the vertical rods inside the door, connecting through channels routed during door fabrication. The result is a cleaner exterior appearance preferred by architects on glass and wood doors. CVR devices are common in office buildings, healthcare facilities, and corporate environments.

CVR devices tend to have more complex part structures because the rods and latches operate through the door thickness. Worn CVR parts are harder to access but just as critical to replace: the rod guide assemblies, internal latch bolts, and top and bottom strike hardware all require periodic attention.

The Von Duprin 78 Series and 75 Series are leading CVR exit devices. The 75 Series is particularly common in narrow-stile aluminum door applications.

Key Exit Device Parts Explained

Regardless of the device type, a handful of components account for the vast majority of replacement part orders. Understanding each one helps you diagnose problems accurately.

Touchbar and Crossbar Assembly

The touchbar or crossbar is the horizontal push element that users engage to operate the device. It takes the most direct physical abuse of any component. Bars can loosen, warp, or lose their spring return over years of use. On high-traffic doors in schools and transit hubs, touchbar wear is often visible and easily identified without disassembly.

Latch Bolt and Latch Case

The latch bolt is the spring-loaded component that engages the strike and keeps the door latched. The latch case houses the mechanism that retracts the latch when the touchbar is depressed. A worn or damaged latch bolt often manifests as a door that will not stay closed, or one that requires significant force to latch. Replacing just the latch assembly is far more cost-effective than replacing the full device.

Strike Plates and Floor Strikes

Strikes are the receptors that receive the latch bolt. Rim strikes mount on the frame or mullion, overhead strikes anchor in the top frame, and floor strikes are set into the floor. These parts absorb repeated mechanical impact and are common wear items. A damaged or misaligned strike is a frequent cause of latch failure that has nothing to do with the exit device itself.

Dogging Assembly

Dogging is the feature that allows the latch to be held in the retracted position, so the door can be pushed open without depressing the touchbar. It is typically engaged with a hex key and used in non-fire-rated openings during business hours. The dogging spring and dogging hook are the components most likely to fail in this assembly. A device that cannot dog, or one that will not release from the dogged position, almost always points to a worn dogging spring or adapter spring.

End Cap and Case Cover

The end cap sits at the end of the exit device case and often contains the dogging mechanism. Case covers protect the internal mechanism from dust and debris. Both are relatively fragile and frequently broken during service calls or forced entry attempts. A missing end cap does not just look bad. It allows the dogging cover plate to fall out, and on some models exposes the internal spring to contamination.

Mounting Hardware

Sex bolts, case mounting screws, and strike mounting hardware are small components that are frequently lost or stripped during servicing. Having the correct hardware on hand before starting a repair prevents unnecessary delays. Always confirm the finish specification before ordering, as commercial hardware is available in multiple finishes including aluminum, bronze, brass, and stainless steel.

Von Duprin Exit Device Parts: The Industry Standard

Von Duprin invented the first exit device in 1908 and has remained the dominant brand in commercial exit hardware ever since. Today, as part of Allegion's family of brands, Von Duprin exit devices are installed in millions of commercial, institutional, and government buildings across the United States.

The widespread installation of Von Duprin devices means that locksmiths, facility managers, and contractors encounter this brand on a daily basis. Knowing how Von Duprin series differ from each other is practical knowledge for anyone working in commercial door maintenance. The 98/99 Series is the flagship rim device. The 22 Series is the go-to entry-level rim device for standard commercial applications. The 33/35A Series covers surface vertical rod. The 78 Series is the primary narrow-stile rim device. The 88 Series serves heavy-duty applications.

One important note about parts compatibility: Von Duprin parts are not universally interchangeable across series. A dogging spring from the 22 Series is not the same part as one from the 98/99. Always confirm the exact series and part number before ordering. The interactive parts diagrams on SecurityParts.com are specifically designed to eliminate this confusion.

How to Identify Which Exit Device Parts You Need

Before placing any replacement order, you need three pieces of information: the device brand and series, the specific part name or part number, and the door handing and finish if ordering trim or cosmetic parts.

Start by finding the brand name imprinted on the case or touchbar. Von Duprin will say 'Von Duprin' on the mechanism case. Then look for the model or series designation, which is typically stamped or molded into the case. The series designation (98, 99, 22, 78, etc.) tells you exactly which parts catalog applies to your device.

If you cannot find the model number, the device's physical configuration gives you clues. A single horizontal bar with a latch extending to the strike is a rim device. Visible rods running vertically on the face of the door indicate a surface vertical rod model. A completely smooth door face with no visible rods points to a concealed vertical rod device.

From there, using a parts diagram is the most reliable way to confirm the specific part you need before ordering. SecurityParts.com offers model-specific interactive diagrams for all supported Von Duprin and Falcon series, so you can visually confirm the component and add it to your cart with confidence.

When to Replace vs. When to Repair

The general rule in commercial door hardware is to replace the specific worn component rather than the entire device, unless the damage is structural (a bent or cracked mechanism case) or the device is so old that replacement parts are no longer available. Replacing one part also gives you the opportunity to inspect adjacent components. A worn latch spring often points to a dogging spring that is not far behind.

Replace the entire device when: the mechanism case is physically damaged or bent, the device is more than 20 years old and multiple components are failing together, you cannot source genuine replacement parts, or the device no longer meets current code requirements for the opening.

Repair by part replacement when: the touchbar is loose or does not return, the latch does not retract smoothly, the device will not dog or will not release from dogged position, an end cap is cracked or missing, or a strike plate shows heavy wear or misalignment.

How to Order the Right Parts the First Time

Commercial door hardware returns are expensive and time-consuming. A few habits make a big difference in ordering accuracy. Always note the exact series designation before ordering, not just the brand. Confirm the finish, since sending back a 689 aluminum part when you needed 628 dark bronze costs real money. Use part numbers wherever possible rather than descriptions. And when using an online parts source, take advantage of any interactive diagrams or visual confirmation tools before checkout.

SecurityParts.com stocks replacement parts for the full range of Von Duprin exit device series, including the 98/99, 78, 22, 94/95, 33/35A, 55, 75, and 88 Series, as well as Falcon's 19, 24, and 25 Series exit devices. Each model has a dedicated page with categorized parts, interactive diagrams, and direct add-to-cart functionality. Same-day shipping is available on stocked components from US warehouses, which matters when a door in a critical location goes down.

Frequently Asked Questions

What are the main parts of a commercial exit device?

The core components are the touchbar or crossbar assembly, the latch bolt and latch case, the strike plate, the dogging assembly, the end cap, case cover, and mounting hardware. Vertical rod devices also include top and bottom rods and their respective strikes.

Are Von Duprin exit device parts interchangeable between series?

Generally no. While some smaller hardware items like screws may cross over, latch assemblies, dogging springs, end caps, and strikes are series-specific. Always confirm the exact series before ordering.

What is dogging, and how does it affect parts wear?

Dogging holds the latch in the retracted position so a door can be pushed open without engaging the touchbar. The dogging spring and hook take additional stress in frequently-dogged applications and tend to wear faster than in buildings where dogging is used sparingly.

Do exit devices require regular maintenance?

Yes. Most manufacturers and facility codes recommend annual inspection and lubrication of exit devices. High-traffic openings may warrant more frequent checks. Regular inspection catches worn components before they fail completely.

Do I need a licensed locksmith to replace exit device parts?

For most individual component replacements (strikes, end caps, dogging springs), a knowledgeable maintenance technician can perform the work. More complex repairs involving the latch mechanism or electric components typically benefit from a licensed locksmith or commercial hardware technician.

Final Thoughts

Exit devices are life safety hardware. When a component fails, it is not a cosmetic issue or a minor inconvenience. It is a compliance risk and, in a genuine emergency, a safety concern. The good news is that most exit device problems are fixable with a single, specific replacement part, and most repairs can be completed without pulling the entire assembly off the door.

Knowing the device type, series, and component name is the difference between a repair completed in one visit and a job that drags on through returns and misorders. Use the parts diagrams at SecurityParts.com to identify your components visually, confirm part numbers before ordering, and take advantage of same-day shipping on stocked parts to get your doors back in service quickly.

Browse our complete exit device parts catalog at securityparts.com/exit-devices to find exact replacement parts for Von Duprin and Falcon series devices.