• 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:

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.

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.

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.

Quick Answer

The Schlage L9580 motorized latch retraction is a Grade 1 storeroom mortise lock that retracts its latchbolt on a 24V DC signal, releasing the door without requiring a key or lever press. Four things to know before specifying or ordering:

• Voltage: 24V DC only. 12V will not actuate it. AC will damage the motor.
• Fail mode: Latch-retraction-only, not switchable. No power equals latch extended and door secured.
• Retrofit: Fits the standard L9000 mortise pocket with no frame modification required.
• Monitor options: Available with RX (request to exit), LX (latchbolt monitor), or both.

Security Parts stocks the Schlage L9580 motorized latch retraction chassis with RX, with same-day shipping on stocked components. Call 845-935-0301 for LX or combined configurations.

What the Schlage L9580 Does

The Schlage L9580 is a Grade 1 mortise lock from Allegion's L Series running the storeroom function with motorized latch retraction (MLR), single outside cylinder, and 24V DC operation. The L9580 was released for access-controlled commercial openings where the door has to release on signal without anyone touching the lever. Auto operators, card readers, push-button stations, infection-control corridors, K-12 visitor entries, accessible restrooms. That's the role.

What spec sheets skip is when this lock actually beats an electric strike or a mechanical L9080, and when it doesn't. Here's the working breakdown from a commercial hardware sourcing perspective.

The L9580 runs the storeroom function: outside lever stays fixed (key-only entry from outside), inside lever is always free for egress. Standard institutional configuration for IT rooms, supply closets, mechanical rooms, and access-controlled service corridors.

Motorized latch retraction adds one capability on top of the mechanical storeroom: a 24V DC signal to the chassis tells an internal motor to retract the latchbolt. The door becomes pushable without anyone using the lever or key. When the signal stops, the latch springs back out. The lock secures itself the next time the door closes.

The unit also includes a deadlocking auxiliary latch, so the main latch can't be retracted by a credit-card shim once the door is closed. That's a Grade 1 physical security detail you don't get on lighter electrified hardware.

Schlage L9580 motorized latch retraction chassis with LX. View product page and order.

Where the Schlage L9580 Fits in the L Series Family

Allegion's MLR line splits into two groups. Latch-retraction-only: L9510 (passage), L9580 (storeroom), L9582 (institution). Latch-retraction-plus-lever-control: L9692EL/EU, L9695EL/EU, L9696EL/EU.

The L9580 sits in the first group. It retracts the latch on signal but doesn't electrify the lever itself. If your project needs the lever to lock or unlock electronically, you want the L9692/95/96 line instead. See the Schlage L9692EU motorized latch retraction guide for that specification path.

The L9580 shares chassis dimensions with the broader Schlage L Series mortise lock platform, which means it retrofits the same mortise pocket as a mechanical L9080. Frame stays intact. Wiring runs through the door. That's the structural reason this lock often wins over an electric strike on renovation work.

Trim, finish, lever style, and keyway options carry across the entire L Series. Standard keyway is patented Everest 29 S123, with Primus available for upgraded geographic exclusivity. For a full reference on Schlage key systems including Primus and construction keying, see the Schlage key systems guide. Cylinder formats include FSIC, SFIC, conventional, and less-cylinder. The L9580 is available in 12 finishes: 605, 606, 609, 612, 613, 619, 622, 625, 626, 629, 630, and 643e.

L9580 Certifications and Standards

The L9580 carries the following certifications relevant to commercial specification:

• ANSI/BHMA A156.13 Series 1000, Grade 1: operational and security rating for mortise locks
• UL 10C: positive pressure fire test; UL listed for 3-hour fire door assemblies
• UL 294: access control system performance (Destructive Attack Level 1, Line Security Level 1, Standby Power Level 1, Endurance Level IV with RX; Endurance Level I with LX)
• UL 437: when ordered with a UL 437 Primus cylinder
• ICC A117.1: complies with Accessible and Usable Buildings and Facilities standard
• BAA compliant: all functions meet Buy American Act requirements for government projects
• California State Fire Marshal (CSFM) listed
• Miami-Dade NOA and Florida Building Commission listings for impact and non-impact applications

For a full reference on how ANSI/BHMA grades apply to commercial door hardware specification, see the ANSI/BHMA door hardware standards guide. For fire door compliance requirements affecting UL 10C installation, see the commercial door fire rating guide.

Allegion Connect Wiring System

The Schlage L9580 ships with Allegion Connect, a factory-installed Molex connector system that simplifies installation and field maintenance. All electrical connections at the chassis use factory-installed Molex connectors rather than terminal block or wire-nut field connections. Field wiring connects to the chassis via the matching Molex connector at the installation point.

When servicing the chassis, the connector unplugs cleanly without cutting wires. This eliminates the wire re-termination step that causes most installation-error callbacks on electrified mortise locks. The CON-KIT provides field replacement connectors and terminals for maintenance situations where the connector itself is damaged.

As an alternative to Allegion Connect, the Molex connector may be cut off and the lock installed with traditional wire splicing methods. A 6-inch wiring harness is included with the chassis for situations where additional wire length is needed at the connection point.

For the broader integration of electrified mortise locks into a commercial access control system, see the access control integration guide.

Electrical Specifications That Determine Power Supply Sizing

24V DC only. Not 12V, not multi-voltage, not AC. A 12V panel won't actuate it. AC will damage the motor.

Peak current draws roughly 1.4 amps at the moment of latch retraction, then drops to around 0.1 amps holding current while the latch stays retracted. Sizing matters on multi-lock circuits: two L9580s firing simultaneously can pull close to 3 amps for a fraction of a second, even though average draw stays under one. UL 294 certified access control power supplies handle this if specified properly.

Critical install warning that most distributors skip: don't share a circuit with solenoid-based devices unless transient voltage is suppressed. Solenoids generate voltage spikes when they de-energize, and those spikes damage the L9580 motor. Schlage's installation document specifies a varistor rated at 35V (peak recurrent) installed at the equipment producing the transient. Leave it out, and the motor fails inside a year.

Fail-Safe vs Fail-Secure: How the Schlage L9580 Motorized Latch Retraction Operates

Most electrified L Series locks have a field-selectable fail-safe / fail-secure switch in the chassis. The L9580, L9510, and L9582 do not. They're latch-retraction-only and operate in a single mode: powered means latch retracted, no power means latch extended.

Functionally that's similar to fail-secure (loss of power equals locked). But it's not switchable. If the application requires fail-safe behavior under code (some egress doors, certain stairwells, specific assembly occupancies), the L9580 is the wrong function. A lever-control variant from the same family covers that case.

The underlying L Series chassis is UL listed for 3-hour fire door assemblies under UL 10C, which makes the L9580 appropriate for fire-rated openings under NFPA 80 inspection requirements. For storeroom function codes across the broader L Series, see the commercial lock function codes guide.

When the Schlage L9580 Beats an Electric Strike

Three reasons it usually wins on commercial buildings:

• Frame integrity. An electric strike installation requires the frame to be cut and routed for the strike body. On older hollow metal frames, particularly fire-rated assemblies, that cut can be prohibited or compromise the rating. The L9580 retrofits the existing L9000 mortise pocket without touching the frame.
• Security depth. An electric strike releases the keeper, but the latch on the lock stays extended. That works for most applications. On doors that face attempted forced entry, an L9580 with a one-piece mortise body and deadlocking auxiliary latch is structurally tougher than a strike plate cut into a frame.
• Aesthetics. Electric strikes show a visible faceplate in the frame. The L9580 looks identical to a mechanical L9080 from the outside. Healthcare interiors, hospitality, and high-end commercial often spec mortise hardware specifically for the visual continuity.

Where electric strikes still make sense: simple retrofits where the existing mechanical lock is being kept and only access control is being added, and applications using cylindrical hardware on the door instead of mortise. For a detailed side-by-side comparison, see the dedicated Schlage L9580 vs electric strike guide and the broader electrified mortise lock vs electric strike guide. For electric strike parts and specifications, see the electric strike parts guide.

When a Mechanical L9080 Storeroom Wins Instead

Three scenarios point at L9080 over L9580:

• No access control planned now or later. The MLR premium only pays back when something actually signals the lock. A storeroom that always operates by key doesn't need it.
• No power available at the door. Running 24V DC to an opening that doesn't have it is a real install cost. If the electrical contractor isn't already on site, that wiring run can outweigh the savings of avoiding an electric strike.
• Power instability. Older facilities or those without backup on access control circuits will see the L9580 cycle in and out of operability through the day. A mechanical L9080 is immune to that.

RX vs LX: Which Monitor Option Fits Your Access Control System

The L9580 takes two optional switches.

RX (request to exit) closes when the inside lever rotates, telling the access control panel that someone is exiting legitimately. Suppresses forced-entry alarms and logs valid exits. Most access control systems integrating with L9580 storerooms want RX. The RX switch is rated at 2A at 30V DC and is modular, meaning it can be added to the chassis in the field without opening the lock case.

LX (latchbolt monitor) signals whether the latchbolt is extended or retracted at any moment. Tells the panel whether the door is actually latched, not just closed. Specified for high-security openings where door position switch (DPS) data alone isn't enough. The LX switch is also rated at 2A at 30V DC. With LX installed, the UL 294 rating becomes Endurance Level I (vs Level IV without LX).

Both can be ordered together. Security Parts stocks the L9580 motorized latch retraction chassis with RX as the primary configuration. Call 845-935-0301 for LX-only or RX-plus-LX availability.

Install Mistakes That Damage the Schlage L9580

Three field errors cause most L9580 failures inside the first year:

1. Sharing a circuit with solenoid hardware without a 35V varistor for transient voltage suppression. This is the single biggest cause of premature motor failure. Solenoids generate voltage spikes when they de-energize, and those spikes damage the L9580 motor. The varistor must be rated at 35V peak recurrent and installed at the equipment producing the transient, not at the lock.
2. Wrong voltage at the lock terminals. 24V DC, correct polarity, no AC component. Multi-voltage panels feeding 12V to the lock won't actuate it, and the unit gets returned as defective when nothing was wrong.
3. Improper coordination with panic hardware on the same door. UL listing requires the L9580 to be installed so it doesn't interfere with exit device operation. On openings with both, mount them so they operate independently. The commercial exit device parts guide covers panic hardware specification if both are being sourced together.

How to Source the Right Schlage L9580 Configuration

Every L9580 order needs five specifications confirmed before the order ships:

For new spec, start at the L9580 motorized latch retraction chassis page and build the configuration up from there. For replacements, pull the model number and trim code off the existing lock face and match the same chassis variant.

The Schlage L Series parts and diagrams guide covers component-level sourcing if a single part (lever, escutcheon, cylinder) is what failed instead of the full chassis. For a broader look at L Series mortise lock parts, see the Schlage L Series mortise lock parts guide.

For LX-only configurations, less common finishes, or extended door thickness specifications, call 845-935-0301 to verify availability before placing the order.

For Division 8 specification of the L9580 in construction documents, see the commercial door hardware Division 8 specification guide. For a full catalog of Schlage commercial hardware parts organized by series, see the Schlage commercial hardware parts catalog and the L Series parts catalog. For mortise lock replacement parts and electric strike parts, browse those category pages directly.

The Schlage L9580 motorized latch retraction does one job well: it gives a Grade 1 mortise storeroom lock the ability to release on signal without compromising security or appearance. That's the right call on retrofits where the frame can't be cut, on healthcare and clean-room openings where quiet operation matters, and on access-controlled commercial buildings where mortise hardware needs to last twenty years.

Source it as a complete configuration. Confirm chassis, trim, finish, monitor option, and door thickness before the order ships. Security Parts has stocked Schlage commercial hardware since 2001. The team is reachable for spec verification at 845-935-0301. Two minutes on the phone prevents the wrong-configuration return cycle on a project that probably doesn't have those days to spare.

About the Author

This guide was written by the Security Parts team, a commercial door hardware specialist serving locksmiths, facility managers, general contractors, and access control integrators since 2001. Security Parts stocks Schlage L Series hardware including the L9580 motorized latch retraction chassis, with same-day shipping on stocked items and pre-order compatibility support at 845-935-0301.

Quick Answer

The Von Duprin 88 Series is a wide-stile crossbar exit device available in four configurations. Use this summary to find your opening type quickly:

• Single door to a fixed frame: 88 Rim or 88-F (fire-rated)
• Double door pair, surface rods: 8827 or 8827-F SVR
• Double door pair, concealed rods: 8847-F CVR (fire-rated only)
• Single or double door with mortise lock security: 8875 or 8875-F

The 88 Series is ANSI/BHMA A156.3 Grade 1 certified, tested to 2 million cycles, and carries a 3-hour UL fire rating on fire-rated configurations. It is a mechanical-only device with no motor-driven latch retraction. The RX crossbar monitor switch and E electric unlocking option (mortise only) are available as accessories.

For a full model-by-model parts breakdown, see the Von Duprin 88 Series catalog. For a complete overview of where the 88 Series fits within the Von Duprin product family, see the Von Duprin series guide.

What Sets the Von Duprin 88 Series Apart Before You Pick a Configuration

The Von Duprin 88 Series is a wide-stile crossbar exit device that has been in continuous institutional use since the 1950s. It carries ANSI/BHMA A156.3 Grade 1 certification, which means it is tested to 2 million open and close cycles at rated performance. Every configuration in the series is UL listed for accident hazard installations, and fire-rated versions carry a 3-hour UL fire resistance listing. It runs in four distinct configurations covering rim, surface vertical rod, concealed vertical rod, and mortise applications across single doors, paired doors, and openings where the rod hardware must be concealed inside the door. Choosing the wrong configuration is the most common ordering mistake on this device.

The 88 Series is the wide-stile version of Von Duprin's crossbar line. Its counterpart, the 55 Series, handles narrow-stile applications. The practical distinction is stile width. The 88 Series fits door stiles requiring wide-stile mounting, while the 55 handles narrower stile profiles. Parts do not cross between them. If you are working on a wide-stile opening and your application calls for a crossbar device over a push pad, you are in the 88 Series catalog.

What makes this series specifically different from the push-pad-dominated 98/99 Series is its lever-arm mechanism. The crossbar drives a simple, heavy lever-arm action to operate the latch, rather than the sliding mechanism used on push pad devices. Fewer moving parts across a mechanically robust assembly is why the 88 Series gets specified in correctional facilities, behavioral health units, historic renovations, and oversized institutional openings where the hardware faces sustained physical force and motor-driven electrified options are neither required nor desirable. For a direct comparison of the 88 Series against other Von Duprin exit device families, see the Von Duprin exit device series comparison.

Von Duprin 050004 standard 42-inch crossbar kit for 4-foot 88 Series devices. View product page.

The device ships field reversible with a 42-inch crossbar that is field-sizeable, meaning it cuts to exact door width on site. It is not handed from the factory. One unit services either a left-hand or right-hand opening, which eliminates stocking two separate versions on projects with mixed door swings.

88 Series Options and Accessories Available Across Configurations

Before selecting a configuration, it helps to understand the options available site-wide across the 88 Series:

• RX: Crossbar Monitor Switch. A crossbar-mounted SPDT switch that signals when the push bar is depressed. Used to monitor door use or integrate with access control systems. Available on all configurations.
• KN: Knurled Crossbar. Knurling on the crossbar provides a tactile warning to indicate doors leading to hazardous areas such as stairwells, loading platforms, and boiler rooms. Available on all configurations.
• E: Electric Unlocking. Allows outside lever operation to be controlled by an access control system, fire alarm, or remote switching station. Available on 8875 mortise configurations with BE trim only.
• HW / HH: Hurricane Rated. HW is wind-only rated; HH is wind and impact rated. Available where hurricane-resistant egress hardware is required by local code.

For a full discussion of how the 88 Series fits into a broader commercial egress hardware specification, see the panic hardware guide for commercial doors and the ANSI/BHMA door hardware standards guide.

Matching the Right Von Duprin 88 Series Configuration to Your Opening

Single Door to a Fixed Frame: 88 Rim or 88-F Rim

Von Duprin 1609 rim strike for 88 Series rim device installations. View product page.

The rim device is the most widely installed configuration in the Von Duprin 88 Series. It mounts on the egress surface of a single active door and latches at the frame-side rim strike. It ships with the 299 strike standard. Non-fire-rated devices use 5/32-inch hex key dogging. Fire-rated 88-F devices remove the dogging function because a fire-rated assembly must latch positively every time the door closes.

Available finishes include US26, US26D, US3, US4, US10B, US10, and SPBLK. The rim device covers stock hollow metal doors with 86 or 161 hollow metal door cutouts. If the application is a standard single door egress point and the opening is not a double door pair, this is the correct model.

For fire door compliance context on rim device selection, see the commercial door fire rating guide.

Double Door Pair Without a Center Post: 8827 or 8827-F Surface Vertical Rod

Von Duprin 304L vertical rod bottom strike, standard for 8827 SVR devices. View product page.

The 8827 Series is the surface vertical rod (SVR) configuration for double door openings without a center mullion. The top rod engages a strike at the frame header, the bottom rod engages the floor or threshold, providing three-point latching across the door height. It fits door stiles as narrow as 3-1/2 inches on the standard version. The fire-rated 8827-F fits stiles as narrow as 3-3/4 inches (95mm) and carries the 3-hour UL fire rating required for fire door assemblies. The 8827-F ships with the standard 304L strike and all mounting fasteners.

One installation point that affects parts ordering: the fire-rated and non-fire-rated SVR versions use different top latch assemblies. The 8827-F requires the plunger release bracket (107765) to function correctly. Ordering the non-fire-rated center case for a fire-rated SVR device is the most common wrong-part error on this configuration.

If the 8827 SVR is used on doors taller than 7 feet, extension rods must be ordered separately at the time of the device order. Confirm door height before specifying. The Pullman latch option is also available on 8827 non-fire-rated devices when latchbolts must remain extended at all times, typically used in combination with an electric strike on less-bottom-rod applications.

For parts diagrams and model-level ordering on 8827 and 8827-F devices, see the Von Duprin 75/78/88/94/95 Series parts guide.

Double Door Pair With Concealed Rods: 8847-F Concealed Vertical Rod

Von Duprin 301L fire-rated vertical rod bottom strike, standard for 8847-F CVR devices. View product page.

The 8847-F is the fire-rated concealed vertical rod (CVR) configuration. The rod hardware routes inside the door rather than running on the surface. It is specified when surface-mounted rods are architecturally unacceptable but a wide-stile crossbar device is still required. Hotels, healthcare interiors, and high-end office applications where the egress hardware needs to disappear into the door profile are the typical specification points. It fits door stiles as narrow as 4-3/4 inches (121mm) and ships with the 301L strike. This configuration is available fire-rated only.

Note that the 8847-F fits double metal doors up to 8 feet by 8 feet (2,438mm by 2,438mm). For doors taller than 7 feet, extension rods must be ordered. Also note that 8827-F uses the 377T trim, while 8847-F uses the 376T trim. These trim series are not interchangeable.

High-Security Single or Double Door With Mortise Lock Body: 8875 or 8875-F Mortise

The 8875 is the mortise device configuration, integrating the Von Duprin 7500 mortise lock body into the 88 Series chassis. It is specified when the opening requires the security depth of a full mortise lock combined with code-compliant panic egress. The 7500 body has been the Von Duprin standard mortise body since approximately 1977 and measures 5-7/8 inches high by 4-1/2 inches deep by 1 inch thick.

The same body is used in the 98/9975 mortise device, so if the facility is already maintaining 98/99 Series mortise devices, the lock body components are consistent across both series. The 8875 also supports the E electric unlocking option for outside lever operation, making it the only 88 Series configuration with any form of outside electrical integration.

For paired door 8875 installations, the Von Duprin 575-2 mortise lock strike is required for the center meeting stile on 1-3/4-inch wood door pairs. See that guide to confirm the correct strike specification before ordering. For a full mortise lock context, see the commercial mortise locks guide.

Von Duprin 88 Series Configuration Quick Reference

Trim and Outside Hardware for the Von Duprin 88 Series

Every 88 Series device leaves the factory with device hardware and the standard strike for its configuration. Outside trim is specified separately unless the device is ordered as a complete unit with trim suffix included.

The 880 trim plate is the standard outside trim for 88 Series rim devices, measuring 3 inches wide by 14-3/16 inches long with a 1-5/8-inch bore for cylinder. For full Von Duprin 880 Series trim specifications, see the Von Duprin 880NL trim guide.

Function designations for 88 Series trim:

• EO: Exit only, no outside trim operation
• NL: Night latch, key locks and unlocks from outside
• TP: Thumbpiece outside trim
• TL: Turn lever
• L / L-BE: Lever with or without cylinder
• K / K-BE: Knob with or without cylinder (rarely specified given ADA requirements on most commercial egress doors)
• DT: Dummy trim, non-functional aesthetic match

The 373 Series Control handles outside trim for 8827 SVR and 8875 mortise configurations. The 606, 608, and 609 trims cover specialty outside hardware requirements. Note that the 8827-F uses 377T trim while the 8847-F uses 376T trim. These series-specific trims are not interchangeable between SVR and CVR configurations.

If no cylinder operation is required, add the BE (blank escutcheon) suffix. The trim is always operable without a cylinder when BE is specified. Matching dummy trim uses the DT suffix. On wood doors without sex bolts, specify the WDA cover plate. When sex bolts are used, the 889 cover plate is required.

Sourcing Von Duprin 88 Series Parts at Security Parts

The Von Duprin 88 Series has been in production for over 70 years. Buildings running this device today have units installed in 1988, 2003, and 2019 side by side. Part numbers have evolved across those generations, and a replacement component ordered without knowing the device generation can produce a part that does not fit the specific unit in service.

Security Parts has been in commercial door hardware since 2001 and carries the complete Von Duprin 88 Series catalog organized by model within the series. Every model has its own dedicated page with an interactive diagram of the full assembly. A technician can navigate to the exact device configuration, open the diagram, confirm the failing component visually, and place the order without a cross-reference step or a compatibility guess.

The 8827 non-fire-rated center case and the 8827-F fire-rated top latch are on different model pages, which is what prevents that specific wrong-part order from shipping. The catalog covers both current-generation and legacy hardware. The full Von Duprin brand catalog extends this model-specific organization across every active series for facilities managing mixed Von Duprin hardware.

For a broader look at how 88 Series exit device parts fit into the full Von Duprin component ecosystem, see the Von Duprin parts guide and the exit devices parts guide. For help selecting the right series when the opening type spans multiple device families, see the Von Duprin panic bar selection guide.

Same-day shipping on stocked components. Pre-order compatibility support is available at 845-935-0301 before the order is placed. Browse the complete exit devices catalog for all series coverage with model diagrams.

The Von Duprin 88 Series covers every wide-stile crossbar exit device application from a standard single door egress point to a concealed vertical rod double door fire assembly. Four configurations, multiple active models, ANSI/BHMA A156.3 Grade 1 certification, 2 million cycle testing, and 3-hour UL fire ratings on rated versions. The configuration decision, rim versus SVR versus CVR versus mortise, is what determines which model, which parts, and which outside trim applies to the opening. Getting that decision right before the order is placed is what keeps a commercial or institutional door installation on schedule and code-compliant from day one.

About the Author

This guide was written by the Security Parts team, a commercial door hardware specialist serving locksmiths, facility managers, general contractors, and service technicians since 2001. Security Parts stocks Von Duprin 88 Series parts across all configurations and device generations, with same-day shipping on stocked items and pre-order compatibility support at 845-935-0301.

Von Duprin 575-2 mortise lock strike. View product page and order.

Quick Answer

The Von Duprin 575-2 mortise strike is the paired door configuration of the Von Duprin mortise lock strike, designed specifically for double door pair installations running the 7500 mortise lock body on 1-3/4 inch wood doors. Before you order, confirm all three of the following apply:

• Two active door leaves meeting at a center stile (not a single door meeting a fixed frame)
• A mortise exit device from the 55, 88, 94/95, or 98/99 Series using the 7500 mortise lock body
• 1-3/4 inch wood door construction (metal doors use the 576A or 576B strike instead)

The 575-2 does not ship with the exit device. It must be ordered separately. If all three conditions are met, this is the correct specification and it belongs in the opening.

The Difference Between the 575 and the 575-2 That Most People Miss

This is where most ordering errors originate. The two part numbers look almost identical in a catalog and the difference is structural, not cosmetic.

The 575 serves a single active door leaf meeting a fixed frame. It is the standard optional mortise strike for single door applications.

The Von Duprin 575-2 mortise strike serves double door pair installations where two active leaves meet at a center stile. The "-2" suffix designates the paired door configuration. On that type of opening, the active leaf needs a strike point at the door center, not at the frame. Without this component properly specified, the mortise latch bolt has nothing to engage correctly when the door closes.

This distinction is not about preference or upgrade. It is a functional requirement of the installation type. Getting it wrong means the mortise device does not latch at the center stile, which on a paired wood door opening is an immediate performance failure.

Which Devices and Door Types the Von Duprin 575-2 Fits

The 575-2 mortise lock strike is compatible with every Von Duprin exit device series that runs the same 7500 mortise lock body. That body has been the Von Duprin mortise standard since approximately 1977 and measures 5-7/8 inches high by 4-1/2 inches deep by 1 inch thick.

Compatible series and model configurations:

The application requirement is 1-3/4 inch wood doors. The strike is cut into the door edge at the center meeting stile, which requires wood door construction to support the mortise pocket correctly. Metal door pair applications require different hardware. This is not a universal strike.

575-2 vs 576A vs 576B: Choosing the Right Von Duprin Mortise Strike

Von Duprin offers four mortise strike options for the 7500 mortise lock body. Matching the right strike to the door type and door thickness is the first step of every correctly specified paired installation.

If your paired installation uses metal doors, or if your door thickness is 2-1/4 inches, the 575-2 is not the correct specification. Use the 576A for 1-3/4 inch metal door pairs, and the 576B for 2-1/4 inch applications of either door material. For single door applications with a wood door meeting a fixed frame, the standard 575 applies.

For a broader overview of how mortise exit devices are specified and what components apply across different installation types, see the commercial mortise locks guide and the mortise lock parts guide.

Three Conditions That Must All Be True Before You Order the Von Duprin 575-2

Before this component goes on an order, confirm all three apply to the opening. If any one of them is missing, a different specification is required.

1. Two active door leaves meeting at a center stile. The 575-2 is only correct for double door pair applications. A single active door meeting a fixed frame takes the 575.
2. A mortise exit device configuration from one of the compatible series. Rim devices, surface vertical rod devices, and CVR devices that do not use the 7500 mortise lock body do not use this strike. See the Von Duprin exit device series comparison to confirm which configuration your opening uses.
3. 1-3/4 inch wood door construction. The mortise pocket is cut into the wood door edge at the center meeting stile. Wood doors at this thickness support the correct pocket depth. Metal doors at the same thickness do not support this application and require the 576A instead.

All three confirmed? This component is the correct specification and it needs to be ordered separately from the exit device, since it does not ship with the device by default.

Door Coordinator Requirement on Paired Installations

Double door pair installations using a mortise exit device also typically require a door coordinator. The coordinator ensures the inactive leaf closes before the active leaf, which is necessary for the mortise latch bolt on the active leaf to engage the center stile strike correctly. On a paired installation without a coordinator, the doors can close out of sequence, which prevents consistent latch engagement at the center stile even when the correct 575-2 strike is installed.

If you are specifying a paired wood door installation with a mortise exit device, confirm whether a coordinator and astragal are part of the hardware schedule before ordering the 575-2. The strike is one component of a multi-part paired door assembly, and its performance depends on the full installation being correctly specified.

What Happens When You Get It Wrong

It is worth being specific about failure modes here, because the consequences of ordering the wrong strike on a double door pair installation are not subtle.

If the 575 single door version is ordered instead of the 575-2 for a paired installation, the geometry is wrong. The strike cannot align correctly to the center meeting stile because it was not designed for that configuration. The latch bolt either misses the pocket entirely or produces a partial engagement that does not meet the secure, consistent latching requirement for a fire-rated or commercial egress assembly.

On a fire-rated door pair, this is a code compliance issue under NFPA 80, not just a performance inconvenience. For a complete explanation of fire door pair requirements and how door hardware selection affects compliance, see the commercial door fire rating guide.

If no mortise strike is specified at all on a double door pair, the latch bolt engagement at the center stile depends entirely on the door construction and the meeting stile geometry. In practice, this produces intermittent latching, added resistance on opening, and accelerated wear on the latch bolt itself over high-cycle use.

The 575-2 is listed as optional in the Von Duprin catalog, but optional in this context means it is not a factory default shipment, not that it is unnecessary. On a properly specified paired wood door mortise installation, it belongs in the opening.

Ordering errors on this part also create project delays that are difficult to absorb. A commercial or institutional door opening with a paired mortise exit device is typically on a schedule with inspections and occupancy milestones attached to it. A wrong-strike return cycle on a component that ships separately from the device adds days to a timeline that usually has no room for them.

Ordering and Sourcing the Von Duprin 575-2 Mortise Strike

Commercial door hardware sourcing has a specific and persistent problem that most platforms do not solve: parts are listed by name and part number, but the context that determines whether a part applies to your specific installation is buried in manufacturer documentation that most buyers do not have time to cross-reference on every order. The result is wrong-part orders, return cycles, and the kind of installation delays that damage a contractor's relationship with a general contractor or a facility manager's confidence in their own team.

Security Parts was built around a different approach, and after more than two decades in commercial door hardware, the difference is visible in how the catalog is organized. Every Von Duprin series has its own dedicated page. Every model within each series has its own parts breakdown, organized by component category and anchored by an interactive diagram of the full assembly. When you are sourcing a component for an 88 Series mortise device, you navigate to the 88 Series page, find the mortise device model, open the diagram, and click on the component you need. The part number is confirmed visually against the physical device before anything goes into a cart.

That process eliminates the 575 versus 575-2 confusion because the diagram shows you exactly which strike belongs in a paired door assembly versus a single door assembly.

The platform carries this depth across every active Von Duprin series:

• 22, 33A, 35A, and 55 Series exit device parts guide
• 75, 78, 88, 94/95, and 54 Series parts guide
• 98/99 Series exit device parts guide
• 94/95 Series exit device parts guide

Legacy hardware is not an afterthought here. A 7500 mortise lock body installed in 1985 uses the same strike specification as one installed in 2022 because the body geometry has not changed. That consistency is part of why this strike has been in the catalog for as long as it has, and it is part of why Security Parts stocks it for both current and legacy applications.

The team is reachable at 845-935-0301 for compatibility questions before the order goes through. Same-day shipping applies to stocked components. Browse the full exit devices catalog and the Von Duprin brand page for every active series with model-specific diagrams and pre-order compatibility support. For a complete overview of the full Von Duprin product family, see the Von Duprin parts guide and the Von Duprin series guide.

The 575-2 is a small component that plays a specific and non-substitutable role in double door pair mortise exit device installations. It provides the center meeting stile engagement point that allows the active leaf's latch bolt to function correctly on a 1-3/4 inch wood door paired opening. It does not ship with the device, and it is not interchangeable with the single door 575. Confirm the three conditions, both active leaves present, mortise device configuration confirmed, wood door application verified, and this is the right part.

Source the Von Duprin 575-2 mortise lock strike from Security Parts with model-specific diagrams, same-day shipping on stocked components, and pre-order support when compatibility needs confirming.

About the Author

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

Quick Answer

A door closer parts diagram maps every component in the assembly to a specific part number for your exact model. Here is what you need to know before using one:

• Identify your model first. LCN parts are series-specific and not interchangeable across models.
• The arm is the most commonly replaced part. It must match the spindle profile of your exact series.
• Three hydraulic valves (sweep speed, latch speed, and backcheck) are all externally adjustable without opening the body.
• Every part order requires four specs: Finish (F), Size (S), Hand (H), and Voltage (V) for electrified components.
• Hydraulic fluid is factory-sealed. A leaking closer needs full replacement, not a fluid top-off.
• Security Parts carries interactive door closer parts diagrams by model for LCN 1000, 4000, and 3030/3130 Series closers.

Why a Door Closer Parts Diagram Matters Before You Order

A door closer parts diagram maps every component in the assembly to a specific part number. It sounds simple. The reason it matters is that LCN door closer components are model-specific in ways that are not obvious from the outside. Arms are machined to each series' spindle shape. A 1460 arm will not fit a 4040XP closer because the spindle profiles are different. Drop plates are series-specific. When a component is ordered without confirming the model, the mismatch gets discovered at installation.

The diagram eliminates that problem by connecting the physical device to the correct part before the order is placed. LCN, owned by Allegion and manufacturing door control hardware since 1926, is the default institutional specification in commercial buildings across North America. Here is every component in the diagram, what it does, and what it takes to order it correctly.

For a broader overview of how LCN door closer parts are organized across series, see the LCN door closer parts guide. For help choosing the right closer for a new installation, the LCN commercial door closer selection guide covers selection by door type, traffic level, and application.

How to Identify Your LCN Closer Before Reading the Diagram

This step comes before everything else. The model number is usually located under the cover, on a sticker on the cylinder body. For mechanical closers, the manufacturing date is stamped near the packing nut at the base of the pinion, which is where the arm attaches to the closer body. If the model number is not visible, remove the cover and photograph the internal components, particularly the spindle shape, before attempting to order any arm or internal component.

Security Parts organizes the complete door closer parts catalog by model across LCN 1000 Series, LCN 4000 Series, and LCN 3030/3130 closers. Every model page carries an interactive diagram so the component can be confirmed visually before ordering.

Door Closer Parts Diagram: What Every Component Actually Does

LCN 4000 Series surface mounted closer parts. Browse LCN 4000 Series parts.

Closer Body

The cast iron or aluminum housing that contains every other component. It mounts to the door face, frame, or soffit depending on installation type. ANSI/BHMA Grade 1, the commercial standard, requires the unit to complete 2 million open and close cycles. The body itself rarely fails from wear. When the housing is cracked or dented from physical impact, replacement of the full unit is the correct call because the internal geometry that holds every other component in alignment is compromised.

Spring

The spring stores energy when the door opens and releases it to close the door. Spring power is adjustable through an external screw and is sized to the door width and weight on a scale from 1 through 6. A spring that has weakened over high-cycle use produces a door that moves too slowly to latch reliably. Adjust through the external screw as the first diagnostic step before pursuing component replacement.

Arm

The arm is the most frequently replaced component in the diagram. It connects the closer body to the door or frame and translates spring energy into controlled door movement. LCN produces five arm configurations for different installation requirements:

• Parallel arm runs parallel to the door face when closed : the most common commercial configuration
• Top jamb mounts to the top of the frame when the closer is on the pull side
• Slide track rides in a metal track rather than a fixed pivot, holding the door open at any position along the track
• CUSH N Stop integrates a friction shoe for built-in hold-open function
• Extra Duty Arm (EDA) is reinforced construction for high-use applications

Arm failure is almost always caused by the door being propped open with a wedge and stress-loading the casting in the wrong direction until it cracks at the pivot. Arms are sold separately from the body. For the LCN 4040XP specifically, arm compatibility and template requirements are covered in the LCN 4040XP installation template guide.

Spindle

The spindle is the shaft that connects the internal spring to the external arm. This is the component that makes arm compatibility non-negotiable by series. The 1000 Series spindle profile, covering the 1260 and 1460 models, is different from the 4010, 4020, and 4110 profiles, which are in turn different from the 4040 and 4040XP profiles. Confirm the model before ordering any arm.

Hydraulic Valves

Three valves control three closing phases. Sweep speed manages how fast the door moves from fully open to nearly closed. Latch speed manages the final controlled pull into the latched position. Backcheck provides hydraulic resistance against forceful opening that would otherwise slam the door against a wall or frame. All three are externally adjustable without opening the closer body. For step-by-step valve adjustment procedures, see the commercial door closer adjustment guide.

Hydraulic Fluid

LCN closers are not field-refillable. The fluid is sealed inside the body at the factory. A closer that is leaking hydraulic fluid will produce increasingly erratic and unreliable closing behavior as the level drops. A leaking unit is at end of service life and requires full replacement rather than a parts order.

Drop Plates and Mounting Plates

Drop plates reposition the closer's mounting point when the standard geometry cannot be used due to a window, non-standard frame dimension, or arm geometry requirement. They are series-specific. A drop plate designed for the 4050 Series does not mount correctly on a 4030 Series closer.

Cover Plate and Fasteners

The cover protects internal components. Fasteners are application-specific across wood door, hollow metal door, and metal frame installations. LCN specifies the correct fastener for each application. Using incorrect fasteners creates play in the installation that accelerates wear on every internal component.

LCN Door Closer Series: Which Diagram Applies to Your Device

LCN produces several distinct closer families, each with its own parts diagram and model-specific components. Knowing which series you have determines which diagram to use and which part numbers apply.

LCN 1000 Series surface mounted closer parts. Browse LCN 1000 Series parts.

Electrified and Sentronic Closer Components

Electrified closers and Sentronic fire/life safety models add electrical components to the standard mechanical closer diagram. These require the Voltage (V) specification at the time of order and involve additional components not found on standard mechanical closers.

LCN Sentronic 2310ME, 4310ME, 4410ME closer parts. Browse Sentronic parts guide.

The Sentronic series uses a hold-open mechanism with magnetic or hydraulic release triggered by a fire alarm signal. The Voltage specification becomes required for the cylinder assembly, the on/off switch assembly, and the wiring harness. Sentronic components are not interchangeable with standard mechanical closer components even when mounted on the same door series.

The Smoothee and high security 2210/4210/4510 series carry their own parts diagrams with different cylinder assemblies and arm profiles. These are covered in the LCN Sentronic, SEH, Smoothee, and SEM7800 parts guide.

LCN 4210/4510 Smoothee high security closer parts. View Smoothee parts guide.

What You Need to Order Any LCN Door Closer Part Correctly

Every part order for an LCN door closer requires four specifications. Miss any one of them and the component ships wrong:

• Finish (F): aluminum, dark bronze, light bronze, or the applicable finish code
• Size (S): the spring power size matched to the door width and weight
• Hand (H): right hand (RH) or left hand (LH) based on the door swing direction
• Voltage (V): required for electrified components including electric hold-open arms and Sentronic models

Security Parts structures the door closer parts catalog to surface these requirements at the part level rather than leaving them for the buyer to discover after an incorrect order arrives. The interactive diagram on each model page shows the full assembly, letting you visually confirm the component before specifying finish, size, hand, and voltage.

Fire Door Closer Components and Compliance

Fire-rated doors require closers that are specifically listed for fire door use. The parts diagram for a fire-rated LCN closer differs from the standard version : fire-rated units do not support dogging or hold-open features because the door must latch on every closing cycle to maintain the fire barrier. Components pulled from a standard closer diagram will not satisfy a fire door installation.

ANSI/BHMA Grade 1 certification applies to both standard and fire-rated models. For a complete explanation of fire door rating requirements and how they affect closer selection and component ordering, see the fire door closer adjustment guide. For ongoing inspection and maintenance requirements, the commercial door hardware maintenance checklist covers closer inspection intervals and NFPA 80 requirements. For the full picture of how ANSI/BHMA grades apply to commercial door hardware selection, see the ANSI/BHMA door hardware standards guide.

How to Use the Interactive Door Closer Parts Diagram at Security Parts

Security Parts organizes every LCN closer model into an interactive parts diagram that mirrors the format of the LCN Illustrated Parts List : the manufacturer's own sourcing document : but is accessible online rather than requiring a PDF download.

Here is how to navigate it:

1. Start with your model number. Go to the LCN parts hub and select your series.
2. Open the diagram for your model. Each model page shows the assembly broken into component categories (cylinder assembly, arm assemblies, covers, mounting plates).
3. Identify the failing component visually. Compare the failed part against the numbered diagram to confirm which assembly or individual part applies.
4. Note the part suffix. LCN part numbers follow a series-plus-suffix format (for example, 1460-3077 for a 1460 Series regular arm). The suffix identifies the specific component.
5. Specify finish, size, hand, and voltage. Confirm all four before adding to cart. If any is unclear, call 845-935-0301 before ordering.

For a walkthrough of how to install a replacement closer after ordering, see the commercial door closer installation guide. For an overview of all LCN closer types and which applications each serves, see the commercial door closers types guide.

About the Author

This guide was written by the Security Parts team, a commercial door hardware specialist serving locksmiths, facility managers, general contractors, and service technicians since 2001. Security Parts stocks OEM and aftermarket LCN door closer replacement parts across all active series, with same-day shipping on stocked items and pre-order parts identification support at 845-935-0301.

Quick Answer

The Von Duprin 88 Series catalog covers four wide-stile crossbar exit device configurations: rim, surface vertical rod (SVR), concealed vertical rod (CVR), and mortise. All are ANSI/BHMA A156.3 Grade 1 certified and UL listed for panic exit hardware. The series is mechanical-only by design, available in seven standard finishes, and built around a model-number system where a suffix string tells you the trim function, fire rating, and any special options. Getting the suffix wrong is the most common ordering mistake. This guide walks through every configuration, the trim and finish codes, how to read the model number, and which parts you end up replacing most often.

If you've spent any time maintaining commercial doors, you've worked on a Von Duprin 88 Series device. It's been in continuous production since the 1950s and is probably the most recognizable crossbar exit device in North America. The Von Duprin 88 Series catalog covers rim, surface vertical rod, concealed vertical rod, and mortise configurations, all wide-stile, all carrying ANSI/BHMA A156.3 Grade 1 certification and UL listing for panic exit hardware. It ships with a 42-inch field-sizeable crossbar and a 3/4-inch throw latch bolt. Knowing the model lineup and how the parts are structured is what keeps ordering accurate and returns to zero. Browse the full Von Duprin 88 Series parts catalog or read on for the complete field guide.

The Device That Put Von Duprin on the Map

That's not marketing copy. Contractors and locksmiths who have been in the field for decades will tell you the 88 Rim device was the product that established Von Duprin as the institutional standard. It's been on egress doors in schools, hospitals, government buildings, and correctional facilities for over 70 years because it solves a specific problem extremely well: it handles serious mechanical abuse without needing electronics to do it.

There are no standard electrified options in the 88 Series. No QEL, no MEL, no Allegion Connect integration. That's a design decision, not a gap. In correctional facilities and behavioral health units, you don't want electrified device components that can be targeted or defeated. You want a mechanical crossbar that's built heavy and stays functional under sustained physical force. That's what the 88 delivers, and it's why it still gets specified in environments where the 98/99 Series, with all its electronic integration options, simply isn't the right tool.

One thing worth knowing before we get into the models: the 88 is the wide-stile version of Von Duprin's crossbar line. The 55 Series is the narrow-stile version, commonly used in historic renovations and retro architecture. Both carry the same ANSI/BHMA A156.3 Grade 1 rating. If you're working on a wide-stile door, you're in the 88 catalog. If it's a narrow-stile, you're in the 55 catalog. Parts don't cross between them. For a side-by-side comparison of the full Von Duprin product line, see the Von Duprin series guide.

Von Duprin 88 Series Catalog: Models and Configurations Explained

The 88 Series runs in four configurations. Choosing the right one depends entirely on the door type, opening geometry, and whether the installation requires concealed rod hardware. Here is what each model covers and where it gets used. For a deeper walkthrough of how to match each configuration to a specific opening, see the 88 Series buyer's guide.

88 Rim and 88-F Rim

This is the original. Single-point latch bolt engagement at the frame-side rim strike. Field reversible, which means you can flip it to handle either hinge side without stocking two versions. It ships with the 299 rim strike and all mounting hardware. The non-fire-rated version uses hex key dogging with a 5/32-inch key. The fire-rated 88-F removes the dogging function because a fire door has to latch every single time it closes, no exceptions.

Physical specs: lock stile case measures 8-1/4 inches by 2-3/4 inches by 15/16 inches. Hinge stile case measures 6 inches by 1-3/4 inches by 15/16 inches. Crossbar tubing is 1 inch outside diameter. Neutral projection is 4-3/4 inches; depressed projection is 4 inches. The 88 Rim is part of the full exit devices lineup at Security Parts.

8827 SVR and 8827-F SVR

Surface vertical rod for double door openings without a center mullion. The top rod hits a strike at the door header, the bottom rod hits the floor or threshold. It ships with three strikes: the 299, the 304L standard vertical rod bottom strike, and the 248L-4 panic vertical rod bottom strike. Fits hollow metal doors with 86 or 161 cutouts, and works on door stiles as narrow as 3-1/2 inches on the standard version. The fire-rated 8827-F fits stiles as narrow as 3-3/4 inches (95mm) and carries a 3-hour UL fire resistance rating.

There's one thing on the 8827 that trips people up. The center case for a non-fire-rated 8827 is part number 050415. The fire-rated 8827-F uses a completely different top latch assembly, and the fire-rated version also needs the plunger release bracket (107765) to work correctly. If you order the non-fire-rated center case for a fire-rated device, you'll know about it when the bottom latch starts dragging on the floor. Don't skip that detail.

The 8827 also supports a Pullman latch option. With a Pullman latch, the latch bolt remains extended at all times, which is useful in applications using an electric strike with less bottom rod. Specify "Pullman Latch" at time of order if required.

8847-F CVR

Concealed vertical rod, fire-rated only. The rod hardware routes inside the door so you don't see it on the surface. Gets specified when surface rods aren't architecturally acceptable but the project still calls for a wide-stile crossbar device. Fits door stiles as narrow as 4-3/4 inches (121mm) and ships with the 301L fire-rated strike. Hotels, healthcare interiors, and high-end institutional applications where the egress hardware needs to disappear into the door profile are the typical specification points. The 8847-F is the only CVR configuration in the 88 Series and is available fire-rated only. For full product line context, see the Von Duprin series guide.

8875 Mortise and 8875-F Mortise

The mortise device version of the 88 Series integrates the 7500 mortise lock body, the same body used in the 9975 mortise device from the 98/99 Series. That body has been the Von Duprin mortise standard since around 1977 and measures 5-7/8 inches high by 4-1/2 inches deep by 1 inch thick. If you need no-cylinder operation on the 8875, you specify the BE (blank escutcheon) suffix. Dummy trim adds DT. Matching dummy trim for the knob version is 8875K-DT.

The 8875 is specified when the opening requires the security depth of a full mortise lock combined with code-compliant panic egress. The faceplate on the 7500 lock body has an adjustable bevel and is field reversible without removing the lock from the door. The fire-rated 8875-F is UL listed for 3 hours. For guidance on how hardware specifications apply across all device types, the commercial door hardware specification guide covers mortise and exit device applications.

Von Duprin 88 Series Configuration Quick Reference

How to Read the Von Duprin 88 Series Model Number

The 88 Series model number follows a structured format. Understanding each position in the string prevents ordering the wrong device or trim. Here is the full decoder. For background on what ANSI/BHMA Grade 1 means in practice, see the ANSI/BHMA door hardware standards guide.

Example: RX8827TP-F = RX request-to-exit prefix, 88 Series, 27 surface vertical rod, TP thumbpiece trim, F fire-rated.

Example: KN88EO = KN knurled crossbar, 88 Series, rim device, EO exit-only trim, standard panic-rated.

For help confirming the right model for your specific opening before ordering, call Security Parts at 845-935-0301 or visit the contact page. For guidance on specifying the right configuration from the start, see the commercial door hardware specification guide.

The Trim Suffix System, Explained Simply

This is where most ordering mistakes happen. The suffix at the end of the model number tells you the trim function, and getting it wrong means the outside hardware doesn't work the way the opening requires.

• BE means blank escutcheon, no cylinder, trim is always operable
• DT is dummy trim, non-functional, used for aesthetic matching on the inactive door leaf
• NL is night latch, outside trim locks and unlocks with a key
• TP is thumbpiece outside trim
• L / L-BE is lever function, with or without cylinder
• K / K-BE is knob function. Still available in the catalog but rarely specified anymore because knob hardware doesn't comply with ADA door hardware requirements on most commercial egress doors
• T / T-BE is thumbturn function
• LC is less control, ordered without outside trim
• LT is less trim, ordered without any trim assembly
• EO is exit only, no outside trim at all

One thing specifically about the 8827 SVR: you can't get the NL function just by specifying 88NL on an SVR device. On the 8827 and 8827-F, night latch is only available through the 370 Series trim configured for NL function during installation, or by ordering the TP-NL or K-NL designation at time of order. If you miss it during spec, you'll be back-ordering the right trim assembly on a job that should have shipped complete. Browse all trim-related components in the 88 Series parts catalog.

Von Duprin 88 Series Trim Options

The 88 Series is compatible with several outside trim lines. Trim choice affects the escutcheon size, grip style, and cylinder type. The four most common are:

Von Duprin 88 Series Finishes

The 88 Series is available in seven standard finishes using current ANSI/BHMA finish codes. Not every finish is available on every configuration or trim combination. Confirm finish availability against the specific model at time of order.

Special finishes including 643e Aged Bronze, 693 Painted Black, and antimicrobial Satin Chrome (626-AM) are available by special order. Contact Security Parts at 845-935-0301 to confirm special finish lead times before committing them to a project.

Von Duprin 88 Series Mechanical and Electronic Options

The 88 Series supports several mechanical and electronic options that are added at time of order. These are applied as prefixes or suffixes to the base model number.

Mechanical Options

• HD (Hex Dogging): Standard on most configurations. Cannot be added to fire exit hardware.
• KN (Knurled Crossbar): Adds a textured crossbar surface to provide a tactile warning for openings leading to hazardous areas such as stairs, loading platforms, or boiler rooms.
• HH (Wind and Impact Rated): Hurricane-rated option for coastal or high-wind-load installations requiring both wind and impact resistance.
• HW (Wind-Only Rated): Hurricane-rated option for installations requiring wind resistance without the impact rating.
• RCB (Reinforced Crossbar): Adds structural reinforcement to the crossbar on high-abuse applications.
• PL (Pullman Latch): Keeps the latch bolt extended at all times; typically used on 8827 SVR applications with electric strikes and less bottom rod.

Electronic Options

• RX (Request to Exit / Crossbar Monitor): A switch placed in the exit device that signals when the crossbar is depressed. Used to monitor door use and connect to access control or alarm systems. Available as a standard prefix on most 88 Series configurations.
• E8875 (Electric Mortise): Electric unlocking of the outside lever on the 8875 mortise configuration only. Available in Fail Secure (FSE) or Fail Safe (FS) modes. Standard voltage is 24VDC; 12VDC is available. Specify E prefix, FS or FSE, voltage, and handing (LHR or RHR) when ordering.

The 88 Series does not support QEL, MEL, or Allegion Connect electrification at the device body level. For full electrified device options, the 98/99 Series is the correct product line. If you're managing a mixed facility with both series, the Von Duprin series guide covers how the product lines align to opening requirements.

The Parts You Actually End Up Replacing

The Von Duprin 88 Series catalog at Security Parts organizes components by category within each model. Here's how each category breaks down and what sits inside it. For routine maintenance schedules and inspection intervals, the commercial door hardware maintenance checklist covers 88 Series devices in the exit device sections.

Crossbars and Crossbar Hardware

Von Duprin 050004 standard crossbar kit. View product page and order.

Ships at 42 inches standard, cut to door width in the field. The crossbar reinforcement kit (050459) adds structural support on high-use doors. Tube attaching wedges (090020) and rings (090021) secure the crossbar to the device body. Wedgetite screws (090008 and 090081) and dog screws (090004 and 090083) are the highest-turnover mechanical components on heavily used 88 Series devices. Browse all crossbar hardware in the 88 Series parts catalog.

Lever Arms, Axles, and Security Pins

Lever arm replacement is almost always caused by the dogging screw stripping out. The arm assembly includes the wedge, wedge ring, wedgetite screw, and dog screw. Right-hand lever arm kits are 050438 and 050440. Axles come in pairs (090006) or packs of 10 (090082). Axle security pins are available in a standard pack (090007) or a pack of 50 (033022), which makes more sense if you're servicing multiple 88 Series devices across a large facility.

Vertical Rods for the 8827

The top rod kit for standard 6'8" to 8' doors is 050457. Extension kits cover 8-to-10 foot doors (051705) and 10-to-12 foot doors (050634). Bottom rod kit is 050458. Know the door height before ordering any rod kit because these don't cross between sizes. See the full vertical rod inventory in the 88 Series parts catalog.

End Case and Center Case Components

End case kits come in multiple configurations: 050435 and 050437. End case springs are 090003 in pairs or 090080 in packs of 10. Spring stop kits are 050451 and 050452. For the rim device center case, the 050409 active case applies to EO, DT, and NL trim functions only. Lever, knob, and thumbpiece versions each use a different case specification.

Strikes

Von Duprin 1609 rim strike for 88 Series rim devices. View product page and order.

Rim strikes: 1609 and 1606. Vertical rod bottom strikes: 304L standard, 301L fire-rated, 248L-4 panic-rated. Strike selection depends on device configuration and fire rating status. For concealed vertical rod (8847-F) applications, the 301L fire-rated strike is the standard. Review the strike application chart in the 88 Series catalog for minimum stile width requirements before finalizing strike selection.

Von Duprin 304L vertical rod bottom strike for 8827 SVR applications. View product page and order.

Why the Right Catalog Source Actually Matters for the 88 Series

Here's a real problem that happens all the time with the 88 Series. A facility manager searches for a center case kit under "88 Series" at a general distributor, orders it, and gets a part that doesn't fit the trim function on the device being serviced. That's because the 88 EO center case and the 88 TP center case are different parts. Most general catalogs don't surface that distinction clearly enough to prevent the mistake.

Security Parts is built around the model-first logic that actually reflects how the 88 Series catalog works. Every device configuration has its own page. Every parts category within that configuration is separated so you're not sorting through a flat list trying to figure out what applies to your specific device. The interactive diagram on each model page shows the full assembly so you can identify the failing component visually and confirm the part number before anything goes in the cart.

The catalog also covers legacy parts for devices that have been running since the 1980s and 1990s. Most commercial facilities aren't replacing 88 Series devices on a schedule. A device installed in 1988 might still be running the original mechanism and just needs a lever arm or an end case spring. That cross-generation depth is part of what Security Parts has built over 23 years in commercial door hardware.

Same-day shipping on stocked components from US warehouses. Free shipping on orders over $450. If you're not sure whether a specific part applies to the device generation you're working on, call 845-935-0301 or visit the contact page before the order goes through, not after. The full Von Duprin catalog covers every other active series through the same model-specific structure if you're managing a facility with mixed Von Duprin hardware. For the complete catalog overview across all Von Duprin series, see the Von Duprin series guide.

Von Duprin 88 Series vs. 55 Series: Which One Do You Have?

If you're unsure which series is on the device, check the label on the device body or the crossbar tube. The series number is typically stamped on the end cap. Browse the 55 Series parts catalog if you've confirmed a narrow-stile device. The Von Duprin 22 Series guide covers the push-pad family if you are working on a non-crossbar device. Understanding which product line you're in before placing an order is the single fastest way to eliminate the wrong-part return cycle. For more context on all Von Duprin exit device series, see the 88 Series buyer's guide for a deeper look at configuration selection and application matching. You can also review the ANSI/BHMA door hardware standards guide for an explanation of Grade 1 testing requirements and what they mean for product selection.

About the Author

This guide was written by the Security Parts team, a commercial door hardware specialist serving locksmiths, facility managers, general contractors, and service technicians since 2001. Security Parts stocks OEM and aftermarket replacement components for Von Duprin and other leading commercial door hardware manufacturers, with same-day shipping on stocked items and pre-order parts identification support at 845-935-0301.