Master Lock Co 3895DAT Trailer Lock Combo Set

Product Description

The MASTER LOCK CO 3895DAT is a three-piece trailer security combo set that includes a coupler lock, a receiver lock, and a latch lock, all keyed alike for single-key convenience. The coupler lock secures trailer couplers sized at 1-7/8 inches, 2 inches, and most 2-5/16 inches. The receiver lock uses a push-to-lock mechanism — the lock body presses firmly onto the receiver pin and the key is removed to secure it, fitting both 1/2 inch and 5/8 inch receivers. The latch lock adjusts across six positions from 9/16 inches to 2-3/4 inches, covering a wide range of coupler latch sizes. This set is installed by fleet managers, transport operators, and service professionals who need coordinated trailer hitch security across multiple lock types.

This combo set is suited for use on tow vehicles and trailers in both residential and light commercial fleet applications. The three lock types work together to secure the full hitch assembly — from the ball coupler to the receiver tube to the latch mechanism. The keyed-alike configuration allows a single key to operate all three locks, reducing key burden during daily hook-up and release operations. The adjustable latch lock provides flexibility across varying coupler latch gap dimensions, making the set adaptable to multiple trailer types in a mixed fleet.

Key Features

• Coupler lock fits 1-7/8 inch, 2 inch, and most 2-5/16 inch couplers
• Push-to-lock receiver lock fits both 1/2 inch and 5/8 inch receivers — no tools required to lock
• Adjustable latch lock with six locking positions from 9/16 inches to 2-3/4 inches
• All three locks are keyed alike for single-key operation
• Combo set ships as a package of 2 units

Compatibility

The coupler lock fits 1-7/8 inch, 2 inch, and most 2-5/16 inch couplers. The receiver lock fits 1/2 inch and 5/8 inch receiver tubes. The latch lock is compatible with most coupler latches with jaw openings between 9/16 inches and 2-3/4 inches.

Installation Notes

No tools are required to install the receiver lock — press the lock body firmly onto the receiver pin and remove the key to lock. Power down or disconnect any trailer lighting before servicing trailer hitch hardware. Verify that the coupler lock fully engages around the ball coupler before releasing the tow vehicle. Inspect all three locks for proper engagement before each tow.

Technical Specifications

• Coupler Lock Compatibility: 1-7/8 inches, 2 inches, most 2-5/16 inches
• Receiver Lock Compatibility: 1/2 inch and 5/8 inch receivers
• Latch Lock Adjustment Range: 9/16 inches to 2-3/4 inches (6 locking positions)
• Locking Mechanism (Receiver Lock): Push-to-lock
• Keyed: Keyed alike
• Package Quantity: 2 units per package
• Weight: 8.53 pounds

Standard Information

• Brand: MASTER LOCK CO
• Manufacturer Part Number: 3895DAT