hitch lock

Common coupler sizes include 1-7/8 in, 2 in, and 2-5/16 in. Common receiver/shank sizes shown include 2 in, 2.5 in (2-1/2 in), and 3 in.

Common materials shown include carbon steel, aluminum alloy, and other steel constructions.

Common protections include rust- or corrosion-resistant finishes (chrome plating, powder coat), weather seals and watertight caps, and rubber caps to keep dirt and moisture out.

Several receiver-style locks specify a 5/8-inch pin (0.625 in) for the receiver pin diameter.

Listed towing capacities include 5,000 pounds and 6,000 pounds.

Some coupler-style locks offer multi-level adjustment—for example, listings show 11 adjustable height settings to fit different trailers and vehicles.

Many receiver locks support 2-inch square receivers and larger square shanks such as 2.5-inch and 3-inch.