Von Duprin 110MD-NL Night Latch Cylinder Assembly, Metal Door

The Von Duprin 110MD-NL is a night latch cylinder assembly that adds a keyed outside entry to a rim exit device on a metal door. On a panic exit device, the inside push bar always lets people out, but the outside is blank unless you add trim, and the 110MD-NL is the night-latch trim that provides it: a keyed cylinder mounted on the outside that retracts the latch when you turn the key, so authorized people can enter from outside while egress stays free. It's the "MD-NL" configuration, metal door, night latch with optional pull, and it's compatible with Von Duprin's most common rim exit devices.

What a night latch cylinder assembly does

This is worth understanding, because exit-device trim options confuse people. A rim exit (panic) device latches the door and lets anyone push out from the inside. To get back in from outside, you need outside trim, and the type of trim sets how the outside works. The night latch function is the simplest keyed option: there's no outside lever or knob, just a keyed cylinder, and turning the key retracts the latch so you can pull the door open. Let the key go and the door re-secures, the outside stays locked except when a key is being used.

The 110MD-NL provides exactly that. The key retracts the latch bolt, and an optional pull can be added so there's a handle to grab once the latch is keyed open (the "optional pull required" note means you add a pull if you want a graspable handle). It's the right outside trim for service doors, back entrances, and stairwell or tenant doors where you want keyed entry without a full lever set, the classic "locked outside, key to enter, free exit" setup on a panic device.

Metal door application and broad compatibility

The 110MD-NL is the metal-door (MD) version, prepped for hollow metal door mounting. Its real strength is compatibility: it works across Von Duprin's most widely used rim exit devices, the 22 Series, the 33A/35A Series, the 55 Series, and the 98/99 Series. That broad fit means the same night-latch cylinder kit serves a wide range of openings, whether the building runs economical 22 Series devices or heavy-duty 98/99 Series, which simplifies specifying and stocking the trim.

Because it's a genuine Von Duprin assembly, it matches the device geometry exactly, which a generic cylinder kit can not guarantee on a panic device where the cylinder has to drive the latch retraction correctly.

Von Duprin 110MD-NL specifications

• Type: Night latch cylinder assembly (outside trim) for rim exit devices. Metal door (MD).

• Function: Night latch (NL). Key retracts the latch bolt for outside entry; free egress from inside. Optional pull can be added.

• Door application: Metal (hollow metal) doors.

• Compatibility: Von Duprin 22 Series, 33A/35A Series, 55 Series, and 98/99 Series exit devices.

• Part number: 110MD-NL (SKU 110MD).

Why choose the genuine Von Duprin 110MD-NL

Von Duprin is the most specified exit-device brand in commercial construction, and the 110MD-NL is its night-latch cylinder trim for keyed entry on a rim panic device. You get the simple, durable night-latch function (key to enter, always-free exit), metal-door mounting, the option to add a pull handle, and compatibility across the 22, 33A/35A, 55, and 98/99 Series, all in a genuine Von Duprin assembly that fits and operates as designed. For a service or perimeter door on a Von Duprin rim device that needs keyed outside access, it's the correct, dependable trim.

One thing to confirm before ordering: the 110MD-NL is the night-latch cylinder for metal doors, and a pull is optional (add one if you want a handle). Verify your exit device is one of the compatible rim series (22, 33A/35A, 55, 98/99), confirm your door is metal, and note the cylinder/keying is specified to match your system. If you need a lever or knob outside instead of a night latch, a different trim (like the 230L lever) applies.

Order the Von Duprin 110MD-NL from American Locksets

We stock Von Duprin exit device parts and trim from authorized distribution, so every assembly ships with the manufacturer warranty. Find related trim and parts in the Von Duprin exit device parts and accessories category, see all Von Duprin panic devices and accessories, or browse all exit hardware.