About this item
The Corbin Russwin K157ET is the key-only nightlatch cylinder trim for the ED5000 Series exit device platform. It's specified when outside entry requires a key and no lever or pull handle is needed on the outside of the door. The K12 rim cylinder is included in the package. The trim ships 0-bitted with an L4 keyway, so it arrives ready for your locksmith or keying service to cut and pin to your existing master key system or individual key spec.
The nightlatch function means the outside trim has no lever. Entry from the outside is by key only. From the inside, the panic bar operates normally for immediate egress at any time. This is the correct specification for stairwell re-entry doors, restricted access corridors, loading dock entries, server room doors, and any commercial application where you want controlled outside entry without providing a lever or pull that could invite unauthorized manipulation.
Compatibility Note: The K157ET is not recommended for use on the ED5400 or ED5800 series exit devices. It is compatible with the ED5200, ED5200A (fire-rated), and ED5600 series. Verify your exit device model number before ordering.
Understanding the K157 Nightlatch Function
A nightlatch trim is a specific exit device outside trim configuration. Unlike lever trims (such as the N9 or L9 series) that allow entry by turning a lever when unlocked, the nightlatch has no lever or pull on the outside. Entry is only possible with a key in the cylinder. The door can only be opened from the outside when the key is inserted and turned to retract the latchbolt. This adds a layer of access control to the door that a lever trim alone cannot provide, making the K157ET the preferred specification for doors that must restrict outside entry mechanically without an electronic access control system.
The K12 cylinder included with the K157ET is a rim-format cylinder. Rim cylinders are designed for use with exit device trim and operate the outside mechanism via a tailpiece engagement rather than a cam. The L4 keyway is a Corbin Russwin proprietary keyway used widely across commercial institutional keying systems. If your building already runs L4 keyway hardware, the K157ET integrates directly into your existing master key program once keyed by your locksmith.
Compatible Exit Device Series for the K157ET
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Exit Device Series
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Device Type
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K157ET Compatible?
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Notes
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ED5200
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Rim exit device
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Yes
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Standard width stile, wood and metal doors
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ED5200A
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Rim exit device, fire-rated
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Yes
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3-hour fire rating, A label single and double doors
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ED5600
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Mortise exit device
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Yes
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For mortise exit device applications
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ED5000 (base)
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Multiple configurations
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Yes
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Confirm specific device model with your hardware supplier
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ED5400
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Surface vertical rod
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No
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Not recommended by manufacturer
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ED5800
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Concealed vertical rod
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No
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Not recommended by manufacturer
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Full Specifications
SKUK157ET
Trim DesignK1 Key Only (nightlatch, no pull)
Trim TypeNightlatch, No Pull
Cylinder TypeRim cylinder (K12)
Cylinder IncludedYes
KeywayL4 (Corbin Russwin standard)
Bitting0-Bitted (less keying, ready for keying service)
ApplicationK157 Nightlatch
Package Qty1
Finishes605, 606, 612, 613, 619, 625, 626, 630, 643E, 716
Not CompatibleED5400, ED5800 series
ManufacturerCorbin Russwin (ASSA ABLOY)
Available Finishes
The K157ET is available across the full Corbin Russwin finish range to match existing exit device hardware and door frame specifications. Common finishes include 605 Bright Brass, 606 Satin Brass, 612 Satin Bronze, 613 Oil Rubbed Dark Bronze, 619 Satin Nickel, 625 Bright Chrome, 626 Satin Chrome, 630 Satin Stainless Steel, 643E Aged Bronze, and 716 Satin Aluminum. Select the finish that matches your installed exit device body for a coordinated appearance. The finish code is the last portion of the full model number (for example, K157ET 626 for Satin Chrome).
Keying the K157ET into a Master Key System
The K157ET ships 0-bitted, meaning the cylinder pins have not been cut to any specific key combination. A locksmith or authorized keying service can cut and pin the K12 rim cylinder to a keyed different (KD), keyed alike (KA), or master keyed (MK) specification. If your facility runs an existing Corbin Russwin L4 keyway master key system, the K157ET cylinder can be pinned to work on the same master key as your other L4 keyway hardware without changing keyways. This is a significant benefit on institutional projects where large key hierarchies are already established.
Why Buy the Corbin Russwin K157ET from American Locksets
American Locksets has supplied genuine OEM Corbin Russwin exit device trims and exit device trim and mullion hardware since 2001. The K157ET is in stock at a significant discount off MSRP, with same-day shipping and free shipping on all orders over $300.
Need a lever trim for the same ED5000 exit device? See the Corbin Russwin L9/N9 Lever Trim, the A9/C9/PR9 Lever Trim, or the TH9 Thumbpiece Trim. For electrically controlled trim options on the same device platform, see the N9903ET Fail Safe Lever Trim or the N9905ET Fail Secure Lever Trim. Browse all Exit Hardware and Trims for ED5000 Exit Devices on site.
Need a keying spec confirmed or a volume quote for a multi-door project? Call 877-471-4870 or use live chat for a same-day answer.
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