If you manage commercial doors long enough, you end up sourcing exit devices parts more often than you plan for. A dogging assembly stripped out on a high-traffic corridor door. A center case that stopped latching cleanly on a healthcare egress opening. An end cap bracket cracked after someone propped the door open one too many times. These are not rare events. They are predictable maintenance realities on any building running Von Duprin hardware, which is most commercial buildings in North America. What separates a fast, accurate repair from a week-long wrong-part return cycle is knowing which component category you're dealing with, which part number applies to your specific series and configuration, and why the long version of the hex key matters more than most people think.

Why Exit Device Parts Are Series-Specific, Never Universal

This is the single most important fact to internalize before opening any parts catalog. Von Duprin's exit device lineup covers fourteen active series across push pad, touchbar, crossbar, and mortise configurations. Each series uses components engineered to its own dimensional and mechanical specifications. A dogging assembly from the 22 Series does not fit the 75 Series. A center case for the 98/99 rim configuration is a different part from the center case for the 98/9947 CVR configuration.

The model number stamped on the mechanism case or baseplate is the starting point for every parts order. The first two or four digits identify the series. The function suffix identifies the trim function and configuration. A "-F" suffix means fire-rated, which removes the hex dogging function entirely. Get the model number before the catalog opens.

The Six Component Categories That Cover Most Repairs

Dogging Assemblies

Dogging is the mechanism that holds the push bar in the depressed position, keeping the latch bolt retracted so the door operates freely without latching. Standard on non-fire-rated 22, 33A, 35A, 98, and 99 Series rim devices. The dogging assembly on devices made after 1997 consists of four parts that are commonly replaced individually:

• 090040 Dogging Shaft: The piece the 5/32-inch hex key inserts into. The hole depth is only approximately 1/4 inch. The long version of the hex key is mandatory. Short keys round out the hex engagement over repeated use. This is the single most common dogging failure in the field.
• 090041 Dogging Spring: Activates the dogging hook. Occasionally fails and is sold individually.
• 090042 Dogging Adapter Spring: Clips the dogging adapter into the mounting bracket.
• 090043 Dogging Adapter: The housing the shaft and spring fit through.
• 090044 Dogging Hook: Grabs the push bar mechanism and holds the dogged position on 22, 33A, 35A, 98, and 99 Series devices made after 1997.

For devices made before 1997, the old-style dogging shaft has a different dimensional profile. Part 050709 is the conversion kit that updates pre-1997 devices to current spec components.

The 88 Series crossbar devices use a 5/32-inch hex key for a different purpose: the wedgetite screw and dog screw in the lever arm assembly. This is not the same dogging operation as the push pad series, and the 88 Series dogging parts do not cross to push pad series.

Center Cases and Mechanism Cases

The center case is the primary mechanical housing of the exit device. It contains the latch mechanism, the dogging engagement, and the connection to the trim function. Center case specs differ by trim function within the same series, which is where most wrong-part orders happen.

The 22 Series rim center case (part 109012) has been in production for approximately 40 years and replaces all non-fire-rated 22 Series rim center cases with hex key dogging on the hinge-side cover plate. The 2227 SVR center case (part 109358) has been consistent for approximately 30 years. The 88 rim center case 050409 applies to EO, DT, and NL trim functions only. Lever, knob, and thumbpiece versions each use a different specification.

Push Bar and Crossbar Components

The push bar on push pad devices and the crossbar on crossbar devices absorb direct operational load on every door use. Push bar end guides (part on 33A and 98/99 devices) reduce noise and friction at the end of the push bar assembly. Crossbar tube attaching wedges (090020) and rings (090021) secure the crossbar to the device body on the 88 and 55 Series.

Push bar retrofit kits are available for 22 Series rim devices in 36-inch and 48-inch configurations, replacing the push bar assembly without requiring a full device swap.

Strikes

Strike selection depends entirely on the device configuration and fire rating status:

• 299: Standard rim strike for 22, 88, 98, and 99 Series rim devices. Also used as the top strike on 2227, 8827, 9827, and 9927 SVR devices. Measures 1-1/4 inches wide by 2-7/8 inches high, slotted hole spacing 2-1/8 inches.
• 299F: Fire-rated version for the same devices. Same dimensions. Not interchangeable with the 299 on fire-rated assemblies.
• 264: Low-profile alternative rim strike for 22, 88, 98, and 99 devices. Measures 2-7/8 inches tall by 1-1/4 inches wide, roller projection 9/16 inches.
• 304L: Standard floor-mounted SVR bottom strike for 2227, 8827, 9827, and 9927. Square flange outer dimension 1-7/8 by 1-7/8 inches.
• 248L-4: Bottom surface-mounted strike for the same SVR series. Measures 9/16 inch wide by 2-1/2 inches high, hole spacing 1-7/8 inches.
• 1609: Used on double door applications without a center post, combining one SVR leaf and one rim leaf. Not rated for fire doors.

Lever Arms and Axle Components (88 Series)

The 88 Series lever arm is replaced more frequently than any other mechanical component on crossbar devices. The cause is nearly always the same: the dogging screw strips out due to the wedgetite screw seating incorrectly. The right-hand lever arm kit is part 050438. The left-hand kit is 050439. Each includes the wedge, wedge ring, wedgetite screw, and dog screw.

Top Latch and SVR Latch Components

For SVR configurations, top latch bracket replacement kits (050091 for 22/98/9927 Series) replace worn top latch assemblies. The 8827 bottom latch case (050461) covers all non-fire-rated 8827 SVR devices. Latch covers 050464 cover the top and bottom latches on the 8827 and the bottom latch only on the 8827-F fire-rated version.

Electrified Upgrade Parts

Three electrified upgrade kits appear most often in parts orders on commercial facilities:

QEL Modular Conversion Kit (114317-00): Adds quiet electric latch retraction to a mechanical 22, 33A, 35A, or 98/99 Series device. Field-installable without opening the device body on current-generation hardware.

ALK Alarm Kit: Converts the 22, 33A, 35A, 98, or 99 Series to an alarmed exit device. Powered by a standard 9-volt battery. Controlled by a mortise cylinder (sold separately).

QEL Baseplate Conversion Kits: The QELA baseplate conversion kits (040063 for 36-inch devices, 040068 for 48-inch devices) are required on some older devices when adding QEL. The HD-QELA versions (040064 and 040068) cover heavy-duty applications.

How to Source Exit Device Parts Without a Wrong-Part Return

Most wrong-part orders on exit device parts come from searching by component name rather than by model. A dogging assembly listed under "Von Duprin dogging assembly" without a series designation could apply to a pre-1997 device, a post-1997 push pad device, or a crossbar device. The correct part depends on the series and generation.

Security Parts organizes the complete Von Duprin exit devices catalog by series and model. Every model page carries an interactive parts diagram showing the full assembly. Navigate to the correct series, open the diagram, confirm the component visually against the physical device, and place the order from the model-specific parts list. The 98/99 Series, 22 Series, and 88 Series each have their own dedicated pages with complete parts breakdowns.

Same-day shipping on stocked components. Pre-order compatibility support at 845-935-0301 or sales@securityparts.com.

Conclusion

Exit device parts sourcing is a model-first process, not a category search. The series, the configuration (rim vs SVR vs CVR vs mortise), the manufacturing year (pre-1997 vs post-1997 for dogging assemblies), and the trim function all determine which specific component applies to the device on the door. The dogging shaft 090040 requires the long hex key. The center case specification depends on the trim function, not just the series. The 1609 strike is not rated for fire doors. Starting with the model number before opening the exit devices parts catalog is what makes the first order the right order.

FAQs

Are exit device parts interchangeable between Von Duprin series?

 No. Parts are series-specific and often configuration-specific within the same series. A 22 Series center case does not fit a 75 Series device. Always confirm the model number before ordering.

What hex key size is used for Von Duprin dogging? 

5/32-inch hex key for push pad devices (22, 33A, 35A, 98, 99 Series). The dogging hole is only 1/4 inch deep, so the long version is required. Short keys round out the shaft engagement over time.

What is the difference between the 299 and 299F strike? 

The 299 is the standard rim strike for non-fire-rated devices. The 299F is the fire-rated version. Same dimensions, not interchangeable. The 299F carries the UL fire door listing required on fire-rated assemblies.

What causes an 88 Series lever arm to need replacement? 

The most common cause is the dogging screw stripping out when the wedgetite screw is not seated correctly. The lever arm kit includes the wedge, wedge ring, wedgetite screw, and dog screw.

What is the QEL modular conversion kit?

 Part 114317-00 adds quiet electric latch retraction to an existing mechanical Von Duprin device, allowing electronic outside entry without a full device replacement. Compatible with 22, 33A, 35A, and 98/99 Series.