Master Lock MLS377KA Coupler Lock Universal trailer coupler lock Keyed alike

The Master Lock MLS377KA is a universal trailer coupler lock, keyed alike, for 1-7/8 inch and 2 inch couplers, nickel-plated zinc.

A coupler lock addresses a theft that takes about fifteen seconds. An unattended trailer with an open coupler can be backed onto by anybody with a ball hitch and driven away — no tools, no forcing, no noise. Hitch theft is common precisely because it requires nothing.

A coupler lock fills the coupler so a ball cannot enter it. That is the whole mechanism, and it works because there is no way to tow a trailer whose coupler is occupied.

The 1-7/8 and 2 inch fitment covers the two common ball sizes on light and medium trailers, which is what makes it universal within that range. Larger couplers need a larger lock — confirm the size before ordering.

Keyed alike is the specification worth thinking about here, and it is the right call for a fleet. Someone running several trailers wants one key, not a keyring and a guessing game in a yard at six in the morning. The cost is that one compromised key opens all of them.

Nickel-plated zinc resists the weather a lock left on a trailer in a yard will live in.

Note that a coupler lock secures the coupler, not the trailer. Wheel and chain locks address different attacks.

Brand

Master Lock

SKU

MLS377KA

Category

Safety Products

Weight

3.5 lbs

Dimensions

4.00 x 3.50 x 2.50

Price

$45.95

Availability

In stock

Rating

3.74 / 5.0