Are Von Duprin panic bar parts interchangeable between the 98 and 99 Series?

Yes. The 98 has a smooth mechanism case and the 99 has a grooved case, but all internal components including dogging assemblies, center case kits, and latch hardware are fully interchangeable between the two.

What hex key size does a Von Duprin 22 or 99 Series dogging assembly use?

A 1/4-inch hex key for push pad dogging on 22, 33A, 35A, 98, and 99 series devices. The 55 and 88 Series crossbar devices use a 5/32-inch hex key. Always use the long version because short keys do not reach the full depth of the dogging shaft.

How do I know if my Von Duprin device uses old-style or current-style dogging parts?

Devices manufactured before July 1997 use the old-style dogging shaft (approximately 1-1/2 inches long by 1/2-inch diameter). Post-1997 devices use current-spec parts including the 090040 dogging shaft and 090044 dogging hook. The 050709 retrofit assembly updates pre-1997 devices.

What is the difference between the Von Duprin 304L and 248L-4 strikes?

Both are SVR bottom strikes for 2227, 8827, 9827, and 9927 configurations. The 304L is the standard version. The 248L-4 is the panic-rated version and is required on panic hardware applications. They are not interchangeable.

What does the "-F" suffix mean in a Von Duprin model number?

Fire-rated configuration. Fire-rated devices remove the dogging function because fire doors must latch automatically every time. These devices carry a UL fire resistance listing for use on rated fire door assemblies.

Von Duprin Panic Bar Parts Guide|Security Parts

Quick Answer

Von Duprin panic bar parts are series-specific and in many cases generation-specific within the same series. Before ordering any component, confirm four things:

Series: Find the model number stamped on the mechanism case or baseplate. The first two to four digits identify the series (22, 33A, 55, 75, 78, 88, 94/95, 98/99).
Configuration: Rim, SVR (surface vertical rod), CVR (concealed vertical rod), WDC (wide door cable), or mortise. Parts differ by configuration even within the same series.
Manufacturing date: Dogging assembly parts differ for devices made before vs after July 1997.
Trim function: Center case kits are trim-function-specific. EO, NL, lever, and thumbpiece trim each use a different case.

Security Parts carries the full Von Duprin parts catalog organized by series and model with interactive diagrams. Call 845-935-0301 for pre-order compatibility support.

Why Von Duprin Panic Bar Parts Are Series-Specific, Not Universal

The most common ordering mistake on Von Duprin panic bar parts is skipping the model identification step and searching by component name alone. A dogging assembly for the 22 Series is not the same as one for the 88 Series. A center case kit for the 98/99 rim device is a different part from the center case kit for the 98/9947 CVR configuration. Von Duprin's exit device catalog covers fourteen active series, each with its own parts tree. Before any component goes into a cart, the series and device configuration on the door need to be confirmed. This guide covers how to do that, what the high-turnover component categories are, and which specific parts apply to which device.

Von Duprin has manufactured panic exit hardware since 1908. That century-plus of production created a lineup covering institutional buildings, correctional facilities, glass storefronts, healthcare campuses, and standard commercial construction, each engineered to different dimensional standards. Component compatibility is tied to the series and configuration within the series, not to a general component category.

The 22 Series is the mid-range commercial Grade 1 specification for employee entrances and mid-traffic openings.
The 98/99 Series is the institutional flagship with the deepest electrified options catalog, covering rim, SVR, CVR, WDC, and mortise configurations.
The 88 Series is the heavy-duty mechanical-only device for correctional and behavioral health environments.
The 78 Series is the narrow-stile unit for aluminum-frame and glass storefront doors.

Every series was built to its own dimensional and mechanical standard. Parts do not cross between them.

One important distinction that prevents ordering errors: the 98 Series has a smooth mechanism case and the 99 Series has a grooved case, but their internal components are fully interchangeable. A center case kit or dogging assembly that fits a 98 fits a 99 without modification. For a full comparison of how the 98/99 differs across configurations, see the 98/99 Series exit device parts guide.

For a broader look at how all Von Duprin series compare by application, see the Von Duprin exit device series comparison and the Von Duprin panic bar selection guide.

The Five Component Categories That Cover Most Von Duprin Panic Bar Repairs

Across all active Von Duprin series, five component categories account for the majority of replacement part orders. Understanding what each category covers and how it varies by series prevents the wrong-part order before it happens.

Dogging Assemblies

Von Duprin 090040 hex dogging shaft. View product page and order.

Dogging holds the push bar in the depressed position, keeping the latch bolt retracted. On push pad devices (22, 33A, 35A, 98, 99 series), dogging uses a 1/4-inch hex key. The crossbar devices in the 55 and 88 Series use a 5/32-inch hex key.

For 22/33/98/99 devices manufactured after July 1997, the relevant parts are:

090040 dogging shaft: The piece the hex key inserts into. The shaft requires the long version of the hex key because the hole depth is only about 1/4 inch. Using a short key rounds out the hex over time, which is the most common dogging failure in the field.
090042 dogging adapter spring: Clips the shaft into the assembly.
090043 dogging adapter: The housing the shaft and spring fit through.
090044 dogging hook: Grabs the push bar mechanism and holds the dogged position, used on 22, 33A, 35A, 98, and 99 devices made after 1997.

For devices shipped before July 1997, the old-style dogging shaft has a different dimensional profile (approximately 1-1/2 inches long by 1/2 inch diameter). The 050709 dogging assembly is the retrofit kit that updates pre-1997 devices to current spec.

Center Case Kits and Mechanism Cases

Von Duprin 050021 center case kit, less cover. View product page and order.

The center case is the primary mechanical housing of the device. Center case specs differ by trim function within the same series, which is where most wrong-part orders originate.

On the 98/99 rim devices, the 050021 center case replaces all earlier versions of the 9827 and 9927 center cases.
For the 98/9975 mortise configuration, the 050023 center case kit applies specifically to the 9875 and 9975 panic and fire-rated hardware.
On the 88 Series rim device, the 050409 active case applies to EO, DT, and NL trim functions only. Lever, knob, and thumbpiece trim functions each use a different case.

Confirming the trim function before ordering the center case is mandatory. Ordering the wrong specification produces a part that physically fits the device body but does not engage the trim correctly.

Push Bar, Crossbar, and Latch Return Components

Von Duprin 090039 baseplate latch return spring, pack of 10. View product page and order.

The 090039 baseplate latch return spring (2-1/4 inches long, 3/8-inch diameter) is used across 22, 33A, 35A, 98, and 99 devices and is one of the highest-turnover mechanical components on high-cycle commercial openings. It controls latch return after the push bar is released.

The 090049 push bar end guide fits the end of the push bar assembly on 33A and 98/99 devices, reducing noise and friction. It is frequently overlooked until noise or erratic bar movement appears.

On 88 Series crossbar devices, the crossbar ships at 42 inches and is cut to door width in the field. Crossbar tube attaching wedges (090020) and rings (090021) secure the crossbar to the device body. Wedgetite screws (090008) and dog screws (090004) are the highest-turnover fastener components on abuse-resistant institutional openings. For more on 88 Series component specifications, see the Von Duprin 88 Series buyer's guide.

Vertical Rod and Latch Hardware

Surface vertical rod (SVR) configurations on the 9827, 9927, 8827, and 2227 models require door-height-specific rod kits. Top rod kits for 6'8" to 8'4" doors use the 050575 adjustable bottom rod on 9947 configurations. Confirm door height before ordering any rod kit because SVR rod kits do not cross between height ranges.

CVR (concealed vertical rod) configurations on the 9847, 9947, 8847, and 2247 models use separate rod and latch hardware from their SVR counterparts. The rod kit for a CVR configuration is not the same as the rod kit for an SVR configuration on the same series. Confirm device type (SVR vs CVR) before ordering any vertical rod component. For detailed 94/95 Series vertical rod and latch part coverage, see the 94/95 Series exit device parts guide.

Strikes

Von Duprin 299 rim strike. View product page and order.

Strike selection depends entirely on the device configuration and fire rating status. These are the specific strikes most commonly ordered:

Part	Type	Applies To	Notes
299	Standard rim strike	Non-fire-rated rim devices	1-1/4" wide x 2-7/8" high; 2-1/8" hole spacing
299F	Fire-rated rim strike	Fire-rated 22, 88, 98, and 99 devices	Same dimensions as 299; 13/16" roller projection
304L	Standard SVR bottom strike	2227, 8827, 9827, 9927 SVR configurations	1-7/8" x 1-7/8" outer dimension; floor mounted
248L-4	Panic-rated SVR bottom strike	2227, 8827, 9827, 9927 SVR panic applications	9/16" wide x 2-1/2" high; 1-7/8" hole spacing; required on panic hardware

The 304L and 248L-4 are not interchangeable. The 248L-4 is the panic-rated version and is required on panic hardware applications. For fire door compliance considerations when specifying strikes on rated assemblies, see the commercial door fire rating guide.

How to Read a Von Duprin Model Number Before You Order

The model number is stamped on the mechanism case or baseplate, visible without disassembling the device. The first two or four digits identify the series. Numbers following the series designate the configuration and trim function.

Suffix	Meaning
EO	Exit only
NL	Night latch
L	Lever trim
BE	Blank escutcheon
-F	Fire-rated configuration (removes dogging function)
EL	Electric latch retraction
QEL	Modular electric latch retraction (field-installable)
MEL	Motorized electric latch retraction

Reading this correctly before opening the parts catalog is the single action that prevents the center case mismatch, the wrong strike, and the dogging assembly ordered for the wrong generation of device. For a detailed breakdown of what each model number position means across all active series, see the Von Duprin parts guide.

For QEL and MEL electrified options on the 22 and 98/99 series, see the Von Duprin QEL vs MEL guide and the QEL conversion kit parts guide.

Von Duprin Panic Bar Parts Availability by Series at Security Parts

Security Parts organizes the complete Von Duprin lineup by series and model, with interactive diagrams on every model page. The interactive diagram on each model page shows the full assembly. Clicking on a component in the diagram confirms the part number before anything goes to the cart. This is what prevents the wrong center case specification from shipping on a device where the trim function was not confirmed at order time.

Series	Key Parts Available
98/99 Series	Center case kits, dogging assemblies, baseplate hardware, fire kits, electrified options
22 Series	Center case kits, dogging assemblies, SVR rod and latch hardware, QEL modular conversion
88 Series	Crossbar hardware, lever arm kits, axle security pins, dog screws, vertical rod kits
33/35A Series	Lever arm kits, cables, EL solenoid assemblies, fire latch hardware
55 Series	7500 mortise lock components, crossbars, soffit latch assemblies
75 Series	Center case kits, center case reinforcing brackets, dogging components
78 Series	Narrow-stile specific center case, baseplate, and cover plate hardware
94/95 Series	Latch retrofit kits, adjustable extension rod kits, ratchet release assemblies

Security Parts has been operating in commercial door hardware since 2001 and carries both current-generation and legacy parts. A device installed in 1991 may use old-style dogging components. A device installed in 2015 uses current-generation specifications. The catalog covers both without requiring a separate sourcing path. Pre-order compatibility support is available at 845-935-0301.

For panic hardware specification in commercial construction projects, see the panic hardware guide for commercial doors. For a full reference on ANSI/BHMA grading standards relevant to exit device specification, see the ANSI/BHMA door hardware standards guide.

Von Duprin panic bar parts are series-specific and in many cases generation-specific within the same series. The 1997 manufacturing cutoff matters for dogging assemblies. The trim function matters for center case kits. The device configuration and fire rating status determine which strike applies. Reading the model number stamped on the mechanism case before opening the catalog is the step that makes everything downstream accurate.

Navigate to the correct series page at the Von Duprin parts catalog, use the interactive model diagram to confirm the component, and place the order from the model-specific parts list. Same-day shipping on stocked components from US warehouses. Pre-order support at 845-935-0301 when compatibility needs confirming before the order commits.

About the Author

This guide was written by the Security Parts team, a commercial door hardware specialist serving locksmiths, facilities managers, general contractors, and access control integrators since 2001. Security Parts stocks the full Von Duprin exit device parts catalog across all active series, with same-day shipping on stocked items and pre-order compatibility support at 845-935-0301.