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

Trailer coupler lock secures a 2-5/16 in (58.6 mm) cast/Bulldog-style coupler to help deter theft when your RV, boat, or trailer is parked. Built with a reinforced steel body and weather-resistant coating, it adds a physical barrier over the coupler for harder access. The quick-fit nesting style installs fast, while the stainless-steel cylinder and dust cap support smoother locking in outdoor conditions.

• Fits 2-5/16 in (58.6 mm) cast/Bulldog-style trailer couplers; check your coupler size before purchase.


• Delivers a heavy-duty barrier with 0.3 in / 7.5 mm wall thickness to help deter prying and tampering.


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


• Includes 3 keys, internal cushion pad for a tighter feel, plus a dust cap to protect the lock cylinder.


• Handles outdoor exposure with powder-coated steel and a 304 stainless-steel lock cylinder for corrosion resistance.

When you can’t watch your rig, a visible coupler lock adds a strong layer of security at the hitch point—ideal for storage lots, campgrounds, marinas, and driveways. The nesting design covers the coupler to make access more difficult, while the cushioned interior helps reduce rattle during fit-up. Keep one key on your keyring and store the spares for peace of mind. Grab yours today and lock up before your next trip.

• Compatible coupler size: 2-5/16 in / 58.6 mm


• Compatible coupler type: Cast / Bulldog-style


• Materials: Carbon steel body, 304 stainless-steel lock cylinder, surface coating


• Wall thickness: 0.3 in / 7.5 mm


• Weight: 13.45 lb / 6.1 kg


• Dimensions: 6.69 x 4.53 x 6.69 in / 170 x 115 x 170 mm


• Style: Nesting


• Keys: 3 included