Trailer Coupler Lock, 2-5/16 in, Heavy Duty, 3 Keys

Trailer coupler lock secures 2-5/16 in (58.6 mm) cast ball couplers to help deter hitch theft when your RV, trailer, or boat is parked. Built from heavy carbon steel with a thick-wall nesting design, it shields the coupler from prying and drilling attempts. Powder-coated protection, a dust cap, and a smooth-operating lock keep it ready for outdoor storage and frequent towing stops.

• Fits 2-5/16 in (58.6 mm) cast ball couplers; confirm coupler type and size before purchase.


• Delivers heavy-duty protection with 0.24 in (6 mm) wall thickness and a 10.14 lb (4.6 kg) steel body.


• Installs in under 30 seconds—unlock, place over coupler, and lock; one-handed operation.


• Includes 3 keys plus an internal cushion pad to reduce rattle and help maintain a snug, stable fit.


• Resists weather with powder-coated surfaces and a dust cap to help block moisture and grime.

Protecting your trailer shouldn’t slow you down. This hitch lock is designed for quick on/off use at campgrounds, storage lots, driveways, and marinas while adding a strong physical barrier around the coupler. The nesting shape covers critical access points, and the corrosion-resistant finish supports year-round outdoor conditions. Keep one key on your tow vehicle and spares where you need them. Grab yours today and lock up before the next stop.

• Compatible coupler size: 2-5/16 in / 58.6 mm (cast ball coupler)


• Main material: Carbon steel with protective surface coating


• Wall thickness: 0.24 in / 6 mm


• Product weight: 10.14 lb / 4.6 kg


• Product dimensions: Ø5.59 x 6.89 in / Ø142 x 175 mm


• Internal diameter: 5.04 in / 128 mm


• Internal depth: 4.92 in / 125 mm


• Keys included: 3