If you've ever stared at a hardware schedule wondering whether to order the 575 or the 575-2, you're in good company. Most catalog listings give you one line, "optional mortise strike for paired doors," and leave the rest to guesswork. The 575-2 mortise lock strike is an optional component for double door pair installations running the Von Duprin 7500 mortise lock body on 1-3/4 inch wood doors. It works across the 55, 88, 94/95, and 98/9975 series mortise exit device configurations. Knowing exactly when this part applies, and when it does not, is what keeps an installation from requiring a callback.

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 575-2 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 It Fits

The 575-2 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:

• 55 Series- 5575 and 5575-F mortise configurations
• 88 Series- 8875 and 8875-F mortise configurations
• 94/95 Series- 9475 and 9575 concealed vertical rod and mortise configurations
• 98/99 Series- 98/9975 and 98/9975-F mortise exit device 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.

Three Conditions That Must All Be True Before You Order

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.

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.

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.

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.

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.

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, not just a performance inconvenience.

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.

Why Security Parts Is the Right Source for Von Duprin Parts

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, including the 55, 88, 94/95, and 98/99 lines, plus the full LCN, Schlage, and Falcon catalogs for facilities managing mixed hardware across a building. The Von Duprin exit devices catalog and the broader Von Duprin brand page cover every series with the same model-first organization, interactive diagrams, and pre-order compatibility support.

Legacy hardware is not an afterthought here. Most commercial facilities are not running uniform current-generation hardware across all their openings. A hospital or government building with Von Duprin devices installed in 1988 still needs replacement components for those specific device generations, and the Security Parts catalog supports that depth. 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 or sales@securityparts.com for compatibility questions before the order goes through. Same-day shipping applies to stocked components. For facility managers and contractors coordinating multi-door projects, that combination of catalog precision and shipping speed is the difference between a job that stays on schedule and one that does not.

Conclusion

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

FAQs

What is the Von Duprin 575-2 used for?

 It is the double door pair mortise strike for the 7500 lock body, providing the latch engagement point at the center meeting stile on 1-3/4 inch wood door paired installations.

What separates the 575 from the 575-2? 

The 575 is for single door applications. The 575-2 is for double door pairs with two active leaves meeting at a center stile. Functionally different, not interchangeable.

Does it ship with the Von Duprin mortise exit device?

 No. It is optional and must be specified and ordered separately when the installation is a double door pair application.

Which series is this component compatible with?

 55, 88, 94/95, and 98/99 Series mortise exit device configurations. All run the same 7500 mortise lock body, which this strike is designed to engage.

Does this component work on metal door pairs? 

No. The application is 1-3/4 inch wood doors only. Metal door paired applications require different strike hardware.

What happens if no mortise strike is specified on a paired door installation? 

Intermittent latching, accelerated latch bolt wear, and potential code compliance failure on fire-rated assemblies. On a paired wood door mortise installation, this component is functionally required.

How do I confirm compatibility before ordering? 

Security Parts carries this component within model-specific parts pages with interactive diagrams. Pre-order support is available at 845-935-0301 or sales@securityparts.com.