The Alarm Lock P5849 US10B Replacement Latch Assembly is a commercial-grade mechanical deadlatch designed for compatible Alarm Lock Trilogy electronic cylindrical locksets.

Featuring a 2-3/4-inch backset, 1-1/8" × 2-1/4" square-corner faceplate, and US10B oil-rubbed bronze finish, this replacement latch provides a manufacturer-specified service component for maintaining compatible Trilogy keypad and electronic lever locks.

The P5849 is designed to replace a worn, damaged, or malfunctioning latch assembly without requiring replacement of the entire electronic lockset.

As part of the Alarm Lock Trilogy cylindrical lock hardware system, the latch mechanically engages the door strike to secure the opening when the door is closed. When the lock is properly authorized and operated, the latch retracts to allow the door to open.

The 613 / US10B oil-rubbed bronze finish coordinates with dark bronze commercial door hardware, electronic lock trim, and architectural finishes commonly found in offices, retail facilities, healthcare buildings, schools, and institutional properties.

Designed for commercial locksmiths, door hardware installers, and facility maintenance departments, the Alarm Lock P5849 US10B offers a practical replacement solution for compatible Trilogy electronic cylindrical locks.

This listing is for the replacement latch assembly only. The electronic keypad, lever handles, cylindrical lock body, and complete lockset are not included.

Key Features and Benefits

Factory-Specified Replacement Latch

• Designed for compatible Alarm Lock Trilogy cylindrical locks.

• Replacement for damaged, worn, or malfunctioning latch assemblies.

• Maintains the manufacturer's specified 2-3/4" backset configuration.

• Suitable for commercial electronic lock maintenance.

• Allows replacement of the mechanical latch without purchasing a complete lockset.

• No electronic programming required for the replacement latch itself.

Standard 2-3/4" Backset

• Fixed 2-3/4" backset.

• Designed for commercial door preparations requiring this dimension.

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

• Compatible with properly prepared doors and lock bodies.

• Not interchangeable with 2-3/8" backset assemblies unless the door and lock installation specifically accommodates the change.

Square-Corner Faceplate

• 1-1/8" wide faceplate.

• 2-1/4" tall faceplate.

• Square-corner construction.

• Designed for compatible mortised door-edge preparations.

• Provides a finished appearance at the door edge.

• Oil-rubbed bronze finish coordinates with matching electronic lock trim.

Commercial Deadlatch Operation

• Mechanical latchbolt assembly for compatible cylindrical electronic locks.

• Works with the lock's existing mechanical retraction mechanism.

• Provides door-latching engagement with a properly aligned strike.

• Suitable for normal commercial door traffic when correctly installed.

• No independent electrical wiring or battery required.

US10B Oil-Rubbed Bronze Finish

• Finish designation US10B / 613.

• Dark oxidized bronze appearance.

• Coordinates with oil-rubbed bronze commercial hardware.

• Suitable for matching Alarm Lock Trilogy lever and trim finishes.

• Complements dark bronze hinges, door closers, and architectural hardware.

Convenient Maintenance Replacement

• Designed for replacement of existing compatible latch assemblies.

• Useful for commercial door service and repairs.

• Helps restore normal latch engagement.

• Suitable for preventative maintenance inventories.

• Reduces unnecessary replacement of functioning electronic lock components.

Technical Specifications

Specification	Details
Manufacturer	Alarm Lock
Parent Company	NAPCO Security Technologies
Manufacturer Part Number	P5849 US10B
Alternate Part Format	P5849-10B
Product Series	Trilogy Accessories
Product Type	Replacement Latch Assembly
Latch Type	Single-Point Deadlatch
Lock Application	Cylindrical Electronic Lock
Backset	2-3/4"
Faceplate Width	1-1/8"
Faceplate Height	2-1/4"
Faceplate Corners	Square
Finish	Oil Rubbed Bronze
Finish Code	613 / US10B
Primary Compatibility	Trilogy Cylindrical Locks
Installation	Door Edge
Operation	Mechanical
Electrical Power Required	No
Battery Required	No
Electronic Programming	No
Complete Lockset Included	No
Selling Unit	Each

Compatible Alarm Lock Products

The P5849 latch family is used with compatible Alarm Lock Trilogy cylindrical locksets, including selected models within the following series:

Alarm Lock DL2700 Series

• Electronic keypad cylindrical lever locks.

• Suitable for applicable 2-3/4" backset configurations.

Alarm Lock DL2800 Series

• Programmable electronic cylindrical locks.

• Compatible when equipped with the matching standard latch configuration.

Alarm Lock DL3000 Series

• Commercial electronic keypad locksets.

• Supports the appropriate cylindrical latch preparation.

Alarm Lock DL4100 Series

• Electronic cylindrical locks with privacy/residency functions.

• Compatible where the original installation specifies the P5849 latch configuration.

Compatibility Note: Confirm the exact lock model, backset, latch type, and faceplate dimensions before ordering. Not every lock or configuration in these series uses the same replacement latch.

How the Alarm Lock P5849 Works

1. Door Closing

When the commercial door closes, the spring-loaded latchbolt contacts the door-frame strike.

2. Latch Engagement

The latchbolt retracts as it contacts the strike and projects into the strike opening when the door reaches the closed position.

3. Secured Door Operation

The existing Alarm Lock Trilogy lock body controls whether the lever can retract the latch.

4. Authorized Access

When an authorized access code, credential, or applicable mechanical key override is used, the connected lock mechanism permits normal latch retraction.

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 latchbolt engages the strike according to the existing lock's operating configuration.

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

Typical Commercial Applications

Commercial Office Buildings

• Employee entrances

• Interior office doors

• Restricted access rooms

• Administrative areas

Retail Stores and Shopping Centers

• Employee-only doors

• Stockroom entrances

• Service corridors

• Commercial office areas

Hospitals and Healthcare Facilities

• Administrative offices

• Staff access doors

• Storage rooms

• Maintenance areas

Schools and Educational Facilities

• Classrooms with compatible electronic locks

• Faculty offices

• Administrative entrances

• Maintenance rooms

Warehouses and Distribution Centers

• Employee access doors

• Inventory control rooms

• Supervisor offices

• Restricted storage areas

Hotels and Institutional Facilities

• Staff service areas

• Maintenance rooms

• Administrative offices

• Compatible electronic access doors

Replacement and Maintenance Applications

The Alarm Lock P5849 US10B is an appropriate replacement when an existing compatible cylindrical lock requires a new latch assembly.

Common reasons for replacement include:

• Damaged or worn latchbolt.

• Broken or weakened latch return mechanism.

• Latchbolt sticking or failing to retract smoothly.

• Excessive wear from frequent door operation.

• Damaged latch faceplate.

• Replacement of missing mechanical latch components.

• Restoration of compatible existing Trilogy electronic locks.

Before replacing the latch, inspect the door alignment, lock body, lever operation, strike positioning, and existing latch preparation.

A replacement latch will not correct problems caused by a defective electronic lock body, damaged spindle mechanism, or improperly aligned door.

Product Contents

• (1) Alarm Lock P5849 US10B replacement latch assembly with oil-rubbed bronze faceplate.

Note: Confirm the supplied mounting fasteners with the distributor. A replacement strike, electronic keypad, cylindrical lock body, lever handles, and complete lockset are not included.

Installation Information

The P5849 US10B is intended for use with compatible Alarm Lock Trilogy cylindrical electronic locks.

1. Verify Lock Compatibility

Identify the existing Alarm Lock model and confirm that it uses the P5849 replacement latch with a 2-3/4" backset.

2. Inspect the Existing Door Preparation

Measure the existing backset and confirm that the door is prepared for a 1-1/8" × 2-1/4" square-corner faceplate.

3. Remove Existing Hardware

Follow the applicable Trilogy installation instructions to access and remove the original latch assembly.

4. Install the Replacement Latch

Position the P5849 assembly in the existing door-edge preparation and secure it using the appropriate hardware.

5. Reassemble the Lockset

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

6. Test Mechanical Operation

Verify that the latch retracts smoothly when the lever is properly operated and that the door closes and latches securely.

7. Verify Electronic Operation

Test authorized keypad or credential access and the lock's normal secured mode.

Important Installation Notes

• Confirm the 2-3/4" backset before ordering.

• Verify square-corner faceplate dimensions.

• Not a universal replacement for all cylindrical locks.

• Not intended for Trilogy mortise lock bodies.

• No batteries or external power required for the latch itself.

• Do not substitute for the 2-3/8" backset S5980 latch without verifying the door preparation.

• Maintain proper door and strike alignment.

• Verify applicable fire-door listing requirements before modifying rated openings.

Why Choose the Alarm Lock P5849 US10B?

The Alarm Lock P5849 US10B Trilogy Replacement Latch provides a manufacturer-specified solution for repairing compatible commercial electronic cylindrical locks.

Its 2-3/4" backset, standard square-corner faceplate, mechanical deadlatch design, and oil-rubbed bronze finish make it a practical maintenance part for commercial door technicians and building maintenance professionals.

Replacing a worn mechanical latch can help restore dependable door operation while retaining the existing Trilogy keypad, electronic control components, and lever hardware.