Trailer Coupler Lock, Fits 2 and 2-5/16 In, 3 Keys

Trailer coupler lock helps deter hitch theft by covering your cast coupler and securing the safety chains in one clamp-on unit. Designed to fit 2 in (50.6 mm) and 2-5/16 in (58.6 mm) cast air flow couplers, it adds a visible physical barrier at the hitch point to reduce tampering when parked. The reinforced carbon steel body and protective coating are built for outdoor use on RVs, trailers, and boats, with quick one-handed locking and 3 included keys.

• Fits 2 in / 50.6 mm and 2-5/16 in / 58.6 mm cast air flow couplers; verify coupler type and size before buying


• Delivers clamp-on security that blocks coupler access and helps secure safety chains for parked trailers and RVs


• Resists prying and drilling with reinforced carbon steel construction and 0.2 in / 5 mm wall thickness


• Includes 3 keys plus a dust cap to help protect the lock mechanism from moisture and grime


• Installs in under 30 seconds: unlock, place over coupler, clamp down for a tight, stable fit

Protecting a trailer, RV, or boat starts at the coupler—an exposed hitch is an easy target. This rust-resistant hitch lock is built for frequent outdoor parking, storage lots, campsites, and driveways, adding a durable layer of anti-theft protection without complicated setup. The coated steel housing is made to handle weather, while the compact clamp-on design keeps operation simple when you’re on the move. Grab yours today and lock up your coupler before you leave it unattended.

• Compatible coupler type: Cast air flow coupler


• Compatible coupler sizes: 2 in / 50.6 mm; 2-5/16 in / 58.6 mm


• Style: Clamp-on


• Main material: Carbon steel + surface coating


• Wall thickness: 0.2 in / 5 mm


• Internal space: 5.16 x 5.24 x 4.09 in (131 x 133 x 104 mm)


• Product dimensions: 5.71 x 4.61 x 8.27 in (145 x 117 x 210 mm)


• Product weight: 11.46 lb / 5.2 kg


• Keys included: 3