The Von Duprin 575/2 mortise lock strike is the optional pairs strike for double door openings on 1-3/4 inch wood doors. It receives the latch bolt from the active leaf's Von Duprin mortise exit device when both doors close. Where the standard 575 covers single door configurations, the 575/2 addresses the specific geometry of a double door pair with a coordinator and astragal. Ordering the wrong strike produces a door that fails to latch, rattles in the frame, or creates a compliance gap.

Quick Answer

• The Von Duprin 575/2 mortise lock strike is for double door pairs on 1-3/4 inch wood doors with a coordinator and astragal. It is not interchangeable with the standard 575.
• Compatible with Von Duprin mortise exit device series: 55, 88, 94/95, and 98/9975 (all using the 7500 mortise lock body).
• Strike face dimensions: 1-1/2 inches by 4-7/8 inches. The standard 575 strike face is 1-25/32 inches by 4-7/8 inches - do not substitute one for the other.
• A coordinator is required to ensure the inactive leaf closes before the active leaf. Without it, the bolt has no proper seat.
• The part number is 575-2. Order from the Von Duprin 575/2 product page at SecurityParts.com.

Von Duprin 575/2 Mortise Lock Strike Specifications

Von Duprin 575-2 mortise lock strike. OEM replacement available at SecurityParts.com.

• Part number: 575-2
• Strike type: Mortise lock strike (optional pairs strike)
• Door material: Wood door only
• Door thickness: 1-3/4 inch
• Door configuration: Double door pair with coordinator and astragal
• Strike face dimensions: 1-1/2 inches by 4-7/8 inches
• Compatible mortise lock body: 7500 mortise lock
• Compatible series: Von Duprin 55, 88, 94/95, 98/9975
• Available finishes: US3 (Bright Brass), US4 (Satin Brass), US10 (Satin Bronze), US26 (Polished Chrome), US26D (Satin Chrome), US28 (Satin Aluminum), 313 (Duranodic Dark Bronze)

When ordering, confirm the finish code matches the existing hardware on the inactive leaf. Finish mismatch is a common ordering error on replacement jobs. For guidance on ANSI finish codes and matching, see the commercial door hardware finish guide.

What the 575/2 Actually Does Inside a Mortise Exit Device Assembly

Understanding where this part lives in the assembly makes ordering it correctly much easier.

A Von Duprin mortise exit device houses the 7500 mortise lock body inside the door itself, recessed into a pocket cut into the door edge. When the push bar depresses, the mechanism retracts both the latch bolt and the deadlatch simultaneously. The strike plate mounted on the door frame or inactive leaf is what receives those bolts when the door closes.

On a single door, that strike is on the frame. On a double door pair, the active leaf closes against the inactive leaf, and the 575/2 is what sits on the inactive leaf to receive the active door's latch. The coordinator sequences the closing order so the inactive leaf always closes first. Without that sequence, the inactive leaf blocks the active door from closing into the strike. Without the correct strike on that inactive leaf, the bolt has no proper seat.

The "/2" in the part number is not a revision indicator. It specifically means pairs. That single character in the part number is what separates a correct specification from a component that physically will not fit the opening.

What Is a Coordinator and Why the 575/2 Requires One

A coordinator is a mechanical device mounted at the top of a double door frame that controls the closing sequence of both leaves. Its job is to ensure the inactive leaf always closes and latches before the active leaf swings shut.

This sequence is critical because the inactive leaf carries the 575/2 strike on its edge. If the active leaf closes first, it physically blocks the inactive leaf from reaching its closed position. When that happens, neither leaf latches correctly, and the 575/2 has no bolt to receive.

On fire-rated openings, a coordinator is mandatory. NFPA 80 requires that both leaves of a paired fire door assembly latch independently upon closing. A missing or broken coordinator is one of the most common fire door compliance failures found during AHJ inspections. For a full explanation of fire door hardware requirements, see the commercial door fire rating guide.

The astragal seals the gap between the two leaves and provides the surface the active leaf closes against. The 575/2's narrower strike face (1-1/2 inches versus the 575's 1-25/32 inches) reflects the geometry of the inactive leaf edge where the astragal is present.

Series Compatibility: Where the 575/2 Mortise Lock Strike Applies

The 575/2 is the appropriate optional strike for double door pair configurations across these Von Duprin mortise exit device series:

• Von Duprin 55 Series - the standard commercial mortise exit device for a wide range of interior and exterior openings. On paired 55 Series installations with a 1-3/4 inch wood inactive leaf, the 575/2 is the correct strike. See the Von Duprin 55 Series parts guide.
• Von Duprin 88 Series - heavy-duty, abuse-resistant specification for correctional facilities, government buildings, and high-security openings. The 88 Series uses the same 7500 mortise lock body, so the 575/2 applies identically on paired configurations. See the Von Duprin 88 Series buyers guide.
• Von Duprin 94/95 Series - the mortise device variant of the INPACT recessed push pad line. On paired 1-3/4 inch wood door applications, the 575/2 is the correct inactive leaf strike. See the Von Duprin 94/95 Series parts guide.
• Von Duprin 98/99 Series mortise device (9875/9975) - the same double door pair application on this series requires the 575/2 as the inactive leaf strike. See the Von Duprin 98/99 Series parts guide.

The common thread across all four is the 7500 mortise lock body and the bolt geometry it produces. The 575/2 is sized and positioned for that specific bolt pattern. If you are working with a device that uses a different mortise lock body, verify strike dimensions before assuming this part applies. For a full comparison of Von Duprin series and their configurations, see the Von Duprin exit device series comparison.

575 vs 575/2: The Specification Decision That Cannot Be Made by Eye

These two parts look similar. They serve the same functional role. The difference is entirely in the door configuration they are designed for, and that difference is not adjustable in the field.

The 575 is the standard single door strike. It fits 1-3/4 inch and 2-1/4 inch single doors, plus 2-1/4 inch double door applications with a coordinator. Its strike face measures 1-25/32 inches by 4-7/8 inches.

The 575/2 is the optional pair strike for double door applications at 1-3/4 inch door thickness, where the opening uses a coordinator and astragal. Its strike face is 1-1/2 inches by 4-7/8 inches - nominally narrower, which reflects the geometry of the inactive leaf edge where it is installed.

The decision rule is clear. If the active leaf of a 1-3/4 inch double door pair runs a Von Duprin 55, 88, 94/95, or 9975 mortise device, the inactive leaf needs the 575/2. Every other configuration points to the 575 or a different strike entirely.

Ordering by description instead of by part number and confirmed door configuration is where most 575/2 errors originate. For deeper context on mortise lock hardware and how strikes fit into the full assembly, see the mortise lock parts guide and the commercial mortise locks guide.

How to Identify and Order the Correct 575/2 Replacement

If you are replacing a worn or damaged 575/2 on an existing installation, confirm these four parameters before placing the order:

1. Door configuration: Double door pair only. Single door installations do not use the 575/2.
2. Door material and thickness: Wood door, 1-3/4 inch. Steel or hollow metal door applications require a different strike.
3. Coordinator present: Confirm the coordinator is installed and functional. A worn coordinator that no longer sequences the closing order correctly will cause the same symptoms as a mismatched strike.
4. Finish code: Match the finish code to the existing hardware. Order the specific ANSI finish, not just the part number, to ensure a visual match on the inactive leaf.

If you are unsure whether the installed device is compatible with the 575/2, locate the series number on the mechanism case label of the active leaf's mortise exit device. If it reads 55, 88, 94/95, or 98/9975, and the door is a 1-3/4 inch wood door pair with a coordinator, the 575/2 is the correct strike. Call 845-935-0301 before ordering if you need compatibility confirmation.

Why Security Parts Is the Right Place to Source the 575/2

Hardware this specific requires a sourcing process that is equally specific. General distributors list the 575 and 575/2 side by side with minimal context on which configuration each applies to. When a contractor or facility manager is moving fast, that ambiguity leads directly to a wrong-part order, a return, a delay, and a door that stays non-compliant longer than it should.

Security Parts structures this differently. The 575/2 product page presents the part against its confirmed series compatibility, door thickness, and material requirement so you can verify fit before ordering.

Organized the Way Field Professionals Think

Every series on the platform has its own model page with parts sorted by component category. If you are servicing a 55 Series or 88 Series mortise device installation and need to confirm which strike applies, the exit devices section and mortise locks catalog are organized so you move from series to model to part without navigating through unrelated hardware.

Interactive diagrams on each supported series page show where the 575/2 sits in the complete assembly. That visual confirmation is what prevents the wrong-part order that costs time on both ends of the transaction.

Two Decades of Commercial Hardware Knowledge

Security Parts has operated in the commercial door hardware market since 2001. That history means the catalog supports not just current-generation Von Duprin hardware but legacy models still running in buildings that have not refreshed their hardware inventory in a decade or more. Part number cross-references across generations, compatibility notes across series, and the ability to confirm whether a current part number applies to an older device are all built into how the platform works. That is not something a general hardware distributor provides.

Shipping Timelines That Work for Compliance Deadlines

When a double door pair is out of compliance because the inactive leaf is missing its strike or running a mismatched one, the correction is time-sensitive. Common components including the 575/2 are stocked across multiple US warehouses. Most orders process the same business day. UPS ground is standard, with expedited options when the timeline requires it. Free shipping applies to orders of $450 and above.

Pre-Order Support That Prevents Post-Order Problems

The team is reachable at 845-935-0301 and [email protected]. Compatibility questions, cross-references on older devices, and confirmation that a part number applies to a specific installation are handled before the order goes through. That conversation costs nothing and prevents the return that costs everyone time.

Everything for the Opening, Not Just One Component

A service call on a double door pair rarely ends at the strike. The inspection often reveals worn mortise lock components on the active leaf, a failing door closer, or an electric strike downstream that needs attention. All of it is in the same catalog, sourced from one place. For the full Von Duprin parts catalog, see the Von Duprin parts guide.

Conclusion

The Von Duprin 575/2 mortise lock strike is a precise component for a precise application. Double door pairs, 1-3/4 inch wood doors, coordinator-equipped openings, Von Duprin mortise series 55, 88, 94/95, or 9875/9975. Confirming those four parameters before ordering eliminates every wrong-part outcome this component is known for. Security Parts stocks the Von Duprin 575/2 with same-day shipping on stocked components, full series compatibility documentation on the product page, and direct support for pre-order verification at 845-935-0301. Order by confirmed configuration, not by description, and the installation is right the first time.

About the Author

This guide is published by the commercial door hardware team at SecurityParts.com, a supplier of OEM Von Duprin, Schlage, LCN, Falcon, and Detex parts since 2001. All part numbers, series compatibility information, and specifications are verified against live SecurityParts.com product pages and official Von Duprin documentation. For Von Duprin 575/2 ordering and pre-order compatibility support, call 845-935-0301 or visit the SecurityParts.com contact page.