The Alarm Lock P5849 US3 Replacement Latch Assembly is a commercial-grade, single-point mechanical deadlatch designed for use with compatible Alarm Lock Trilogy electronic cylindrical locksets.

Featuring a 2-3/4-inch backset, 1-1/8" × 2-1/4" square-corner faceplate, and polished US3 / 605 bright brass finish, this replacement latch provides an effective solution for servicing worn, damaged, or malfunctioning mechanical latch assemblies.

Designed for select Alarm Lock Trilogy DL2700, DL2800, DL3000, and DL4100 Series electronic cylindrical locks, the P5849 US3 allows commercial door hardware technicians and maintenance personnel to replace the mechanical latch without purchasing an entirely new electronic lockset.

The latch operates with the existing Trilogy cylindrical lock mechanism to provide secure mechanical engagement with the door-frame strike. When the lock is properly authorized through its keypad, credential system, or applicable mechanical key override, operating the lever retracts the latch and permits the door to open.

The 605 / US3 Bright Brass finish provides a polished gold appearance that coordinates with matching commercial lever handles, hinges, strike plates, and other architectural hardware.

Suitable for commercial offices, educational facilities, healthcare buildings, retail establishments, and institutional properties, the Alarm Lock P5849 US3 provides a practical replacement solution for maintaining electronic access control hardware.

Important: This listing is for the replacement latch assembly only. The electronic keypad, lever handles, cylindrical lock body, strike plate, and complete lockset are sold separately.

Key Features and Benefits

Factory-Specified Replacement Latch

• Designed for compatible Alarm Lock Trilogy electronic cylindrical locks.

• Replaces worn, damaged, or malfunctioning mechanical latch assemblies.

• Maintains the original 2-3/4" backset configuration.

• Allows replacement of the latch without replacing the complete electronic lockset.

• Suitable for commercial door hardware maintenance and repair.

• No electronic programming required for the latch itself.

• Ideal for replacement hardware inventories and service vehicles.

Standard 2-3/4" Backset

• Fixed 2-3/4-inch backset.

• Common commercial cylindrical lock preparation.

• Designed for doors prepared for the corresponding Trilogy latch.

• Backset measured from the door edge to the centerline of the lock spindle.

• Provides the proper latch positioning when installed in compatible lock configurations.

• Not interchangeable with 2-3/8" backset assemblies without verifying compatibility.

Square-Corner Faceplate

• Faceplate width: 1-1/8".

• Faceplate height: 2-1/4".

• Square-corner faceplate design.

• Fits appropriately prepared commercial door edges.

• Provides a professional finished appearance.

• Bright brass finish matches compatible polished brass hardware.

Commercial Mechanical Deadlatch

• Single-point mechanical deadlatch assembly.

• Works with the existing Trilogy cylindrical lock mechanism.

• Provides spring-operated latching when the door closes.

• Engages a properly aligned door-frame strike.

• Designed for normal commercial door operation.

• Does not require independent batteries or electrical wiring.

US3 / 605 Bright Brass Finish

• ANSI/BHMA finish designation: 605.

• US finish designation: US3.

• Bright polished brass appearance.

• Coordinates with matching electronic lock trim.

• Suitable for facilities requiring polished brass architectural hardware.

• Ideal for replacement installations where maintaining the existing finish is important.

Convenient Maintenance and Replacement

• Helps restore normal latching on compatible electronic locks.

• Reduces unnecessary replacement of functioning electronic components.

• Suitable for maintenance departments and commercial locksmiths.

• Practical for repairs involving sticking or damaged latch assemblies.

• Preserves existing electronic lock programming and keypad components.

Technical Specifications

Compatible Alarm Lock Trilogy Models

The Alarm Lock P5849 US3 is designed for compatible cylindrical electronic locksets equipped with the corresponding 2-3/4" latch configuration.

Alarm Lock DL2700 Series

• Commercial electronic keypad cylindrical locks.

• Used for controlled employee and facility access.

• Compatible where the existing lock uses the matching P5849 latch assembly.

Alarm Lock DL2800 Series

• Programmable electronic cylindrical lever locks.

• Used for commercial building security.

• Replacement applications requiring the corresponding standard latch.

Alarm Lock DL3000 Series

• Electronic keypad access control locksets.

• Designed for commercial and institutional security applications.

• Compatible with the appropriate cylindrical mechanical latch configuration.

Alarm Lock DL4100 Series

• Electronic cylindrical locksets with privacy and residency functions.

• Suitable where the original lock uses the specified replacement latch.

Compatibility Note: Not every model or configuration within these series uses the same latch. Confirm the original latch part number, door preparation, and faceplate dimensions before purchasing.

How the Alarm Lock P5849 US3 Works

1. Door Closing

When the commercial door closes, the spring-loaded latchbolt contacts the door-frame strike and retracts into the latch assembly.

2. Mechanical Latch Engagement

Once the door reaches the closed position, the latchbolt projects into the strike opening, securing the door.

3. Electronic Lock Control

The existing Alarm Lock Trilogy lock body determines whether the exterior lever is authorized to operate.

4. Authorized Access

When a valid keypad code, credential, or applicable mechanical key override is used, the electronic lock allows normal lever operation.

5. Door Opening

Operating the authorized lever retracts the P5849 latchbolt, allowing the door to open.

6. Automatic Relatching

When the door closes again, the mechanical latchbolt engages the strike according to the lockset's normal operating configuration.

The P5849 US3 does not contain electronic access control components. All programming, credentials, and electronic functions remain controlled by the existing Trilogy lockset.

Typical Commercial Applications

Commercial Office Buildings

• Employee entrances

• Administrative offices

• Interior commercial doors

• Restricted access rooms

Hospitals and Healthcare Facilities

• Staff access doors

• Medical offices

• Storage rooms

• Administrative departments

Schools and Universities

• Classrooms with compatible electronic locks

• Faculty offices

• Administrative entrances

• Maintenance rooms

Retail Stores and Shopping Centers

• Employee-only doors

• Stockroom entrances

• Service corridors

• Commercial office areas

Warehouses and Distribution Centers

• Inventory control rooms

• Employee access doors

• Supervisor offices

• Restricted storage areas

Hotels and Institutional Facilities

• Staff service entrances

• Administrative offices

• Maintenance rooms

• Commercial electronic access doors

Replacement and Maintenance Applications

The Alarm Lock P5849 US3 is suitable for replacing an existing compatible latch when:

• The original latchbolt is damaged or worn.

• The latch sticks or fails to retract smoothly.

• The latch return mechanism is damaged.

• The latchbolt does not project properly.

• The faceplate is scratched, bent, or damaged.

• The original latch has been removed or lost.

• An existing compatible Trilogy lock requires mechanical refurbishment.

Before replacing the latch, inspect the cylindrical lock body, lever mechanism, strike plate, hinges, and overall door alignment.

A replacement latch will not correct electronic programming problems, damaged electronics, or severe door misalignment.

Product Contents

• (1) Alarm Lock P5849 US3 replacement latch assembly with bright brass faceplate.

Note: Confirm whether mounting screws are included with the current factory package.

The following components are not included:

• Electronic keypad

• Lever handles

• Cylindrical lock body

• Door-frame strike

• Batteries

• Complete Alarm Lock Trilogy lockset

Installation Information

The P5849 US3 is intended for replacement installation in compatible Alarm Lock Trilogy cylindrical locksets.

1. Verify Lock Compatibility

Identify the installed Alarm Lock Trilogy model and confirm that the original latch uses the P5849 configuration.

2. Verify Backset

Measure the distance from the door edge to the lock spindle centerline. The required measurement is 2-3/4".

3. Verify Faceplate Dimensions

Confirm that the door is prepared for a 1-1/8" × 2-1/4" square-corner latch faceplate.

4. Remove Existing Hardware

Follow the applicable Trilogy installation instructions to remove the required lock components and access the original latch.

5. Install Replacement Latch

Position the new P5849 assembly into the existing door-edge preparation and secure it using the appropriate mounting fasteners.

6. Reassemble the Lockset

Reinstall the necessary cylindrical lock components according to the manufacturer's installation instructions.

7. Test Mechanical Operation

Verify that the latch retracts smoothly, returns to its projected position, and properly engages the door-frame strike.

8. Verify Electronic Operation

Test authorized keypad or credential access, applicable key override functions, and normal secured operation.

Important Installation Notes

• Fixed 2-3/4" backset.

• Square-corner 1-1/8" × 2-1/4" faceplate.

• Intended for compatible Trilogy cylindrical locks.

• Not a universal replacement for all cylindrical locksets.

• Not intended for Trilogy mortise lock bodies.

• No independent electrical connections or batteries required.

• Confirm existing latch dimensions before purchasing.

• Maintain proper door alignment and strike positioning.

• Fire-rated openings must retain an approved hardware configuration.

Why Choose the Alarm Lock P5849 US3?

The Alarm Lock P5849 US3 Trilogy Replacement Deadlatch provides a dependable, manufacturer-specified replacement solution for maintaining compatible electronic cylindrical locksets.

Its standard 2-3/4" backset, square-corner faceplate, commercial mechanical latch design, and polished 605 bright brass finish make it a practical choice for commercial door service and maintenance.

Replacing a worn or damaged latch helps restore dependable mechanical door operation while preserving the existing electronic keypad, lever hardware, and access control components.