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.