trailer coupler lock

They cover common ball coupler sizes—1-7/8", 2", and 2-5/16"—and some receiver-style locks note fit for 2" and 2.5" (2-1/2") receivers.

These locks are made from heavy metals and alloys such as carbon steel, aluminum alloy, and zinc alloy, with finishes like chrome plating or electrophoretic (e-coat) paint mentioned for added corrosion resistance.

Most models ship with multiple keys; descriptions commonly list sets that include three or four keys depending on the model.

They’re designed for quick, tool-free installation—several descriptions state locking can be done in under 30 seconds and allow one-handed or tool-free operation.

Adjustability varies by model; some locks list multiple height settings (for example, around 11 positions), while others offer finer adjustment with up to about 20 height settings for a closer fit.