Von Duprin 6400 US32D, electric door strike

The Von Duprin 6400 is a Grade 1 modular electric strike for mortise and cylindrical locks, in a US32D satin stainless steel finish. It's a fail-secure strike, meaning the door stays locked on power loss and the keeper releases only when energized, which makes it the right choice for fire-rated and secured openings. The 6400 is built to fit nearly any latch by letting the installer position the keeper or deadlatch ramp anywhere within a 3-1/8 inch vertical opening, plus 1/8 inch of horizontal adjustment. That adjustability is the whole reason the 6400 earned its reputation as a time-saving go-to strike: it fits openings where misalignment or a tight door prep would stop a fixed strike cold.

Von Duprin 6400 template and installation

Since this is the question most installers come here to answer: the 6400 ships with a self-adhesive template for the frame cuts, so you mark and cut the prep accurately without guessing. It uses a standard 4-7/8 inch faceplate, and Von Duprin includes two faceplates in the box, one for offset locks and one for centerline locks, so the strike matches your latch geometry. For exact dimensions and wiring diagrams, the Von Duprin 6400 Series data sheet is the authoritative source, and we can send it on request. If you're searching for the 6400 electric strike template, the included template plus the data sheet cover both the physical cutout and the wiring.

How the Von Duprin 6400 works

A fail-secure electric strike replaces a fixed strike plate with a powered keeper. When the strike is energized by your access control, card reader, or remote release, the keeper releases and the door opens without operating the lock. Cut the power and it locks again. Because it's fail secure, a power outage leaves the door locked, which is exactly what a fire-rated or secured opening requires. The lock's own latch and the building's egress hardware still provide free exit from inside, so life safety is never compromised.

The modular design is what sets the 6400 apart from a basic strike. The same unit adapts to mortise locks with offset latches and to cylindrical locks, and the vertical and horizontal adjustment absorbs the small misalignments that are common on existing frames, which is why it's a favorite for retrofit work.

Von Duprin 6400 specifications

• Type: Modular electric strike for mortise and cylindrical locks. Non-handed.

• Function: Fail secure (electrically unlocked). Door stays locked on power loss.

• Grade: ANSI/BHMA Grade 1, heavy-duty stainless steel, over 2,000,000 endurance cycles.

• Fire rating: UL 10C listed for 3-hour fire doors. Also UL1034 burglary-resistance rated.

• Adjustability: 3-1/8 inch vertical keeper positioning, plus 1/8 inch horizontal adjustment. Accommodates up to a 1 inch deadbolt (night latch only).

• Voltage: Prewired plug-in connectors for 12 or 24 VDC, field-changeable to 12 or 24 VAC without a converter kit.

• Faceplate: Standard 4-7/8 inch. Two faceplates included (offset and centerline).

• Included: Two plug-in voltage connectors, self-adhesive frame-cut template, trim filler plate, mounting tabs and shims, and tamper-resistant screws with a security driver bit.

• Construction: Internal solenoid design that prevents the keeper from heating up.

• Finish: US32D satin stainless steel.

• Frames: Hollow metal, aluminum, or wood, single doors.

Why choose the Von Duprin 6400

The 6400 is the strike integrators reach for when they want one adaptable, fire-rated unit that installs fast and fits almost anything. The adjustability cuts install time on imperfect frames, the dual faceplates and plug-in voltage connectors mean fewer parts to order separately, and the Grade 1 stainless construction with 2 million-plus cycles is built for high-traffic commercial life. For access-controlled fire-rated openings on mortise or cylindrical locks, it's a dependable default.

One thing to confirm before ordering: the 6400 is fail secure only. If your opening requires fail safe (unlocks on power loss), that's a different strike, so verify your fail mode against the door's code requirements first.

Order the Von Duprin 6400 from American Locksets

We stock the full Von Duprin 6000 Series from authorized distribution, so every strike ships with a real manufacturer warranty. Compare models in the Von Duprin electric strikes category, or browse all electric strikes.