The Von Duprin 575/2 is a mortise lock strike built specifically for double door pair applications on 1-3/4 inch wood doors. It serves as the optional strike on the inactive leaf of a paired opening, receiving the latch bolt from the active door's 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. Getting this wrong does not produce a close fit. It produces a door that either fails to latch, rattles in the frame, or creates a compliance gap that shows up at the next inspection.

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.

Series Compatibility: Where the 575/2 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.
• 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.
• Von Duprin 94/95 Series — surface vertical rod devices in their mortise device variant accept the 575/2 on paired 1-3/4 inch wood door applications.
• 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.

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.

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 straightforward. 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.

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 requirement, and door material specification. You can verify fit before the order ships, not after it arrives. That verification step is built into the platform rather than left to the buyer to reconstruct from scattered spec sheets.

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 sales@securityparts.com. 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. When the 575/2 turns out to be the presenting issue, the inspection often reveals worn mortise lock components on the active leaf, a failing door closer on one of the leaves, or an electric strike downstream in the access control sequence that needs attention. All of it is in the same catalog, sourced from one place, arriving on one timeline. That continuity matters when a building has multiple openings under maintenance simultaneously.

Conclusion

The Von Duprin 575/2 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 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.

FAQs

What is the Von Duprin 575/2 used for? 

It is the optional mortise lock strike for Von Duprin exit devices on double door pair applications with a coordinator, specifically for 1-3/4 inch wood inactive leaves.

What is the difference between the 575 and the 575/2? 

The 575 is for single door and 2-1/4 inch double door applications. The 575/2 is specifically for paired 1-3/4 inch double doors with a coordinator and astragal.

Which Von Duprin series accept the 575/2?

 The 575/2 is compatible with the Von Duprin 55, 88, 94/95, and 98/9975 mortise exit device series that use the 7500 mortise lock body.

Is a coordinator required when installing the 575/2?

 Yes. The 575/2 is a pairs strike and requires a coordinator to ensure the inactive leaf closes before the active leaf for correct latch engagement.

Where can I order the Von Duprin 575/2? 

Security Parts stocks the 575/2 at securityparts.com with full compatibility details, same-day shipping on stocked components, and pre-order support at 845-935-0301.