Trimax UMAX100 Premium Universal 'Solid Hardened Steel' Trailer Lock (fits all couplers)

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One size fits most coupler types
Dual ratchet lock System
Exclusive design provides 360 degrees of hardened steel protection
Key hole cover keeps out dirt
Attractive Ballistic grade Nylon housing
One size fits all (from 1-7/8", 2", to 2-5/15", all coupler types)
Key hole cover slides up to seal out dirt and grime
Attractive ballistic grade nylon housing absorbs hammer blows and protects against weather
Type A key which is a spring loaded, 7 pin, high security key. Resists attempted drill outs. Rugged and durable, the key will not bend or break.
Weighs 6 pounds


The Trimax UMAX100 coupler lock features an exclusive design that provides 360 degrees of hardened steel protection for your unattended trailer. It provides instant security for your camper, boat, or trailer when they are not hooked up to your vehicle. This lock features a huge 6-tooth, 3/8" dual ratchet locking system, a hardened 5/8" 16mm steel shackle, and 1/2-turn technology that cannot be false locked. For dual force security, add a Trimax chain or cable secured to an anchor point. Also, add a Trimax coupler lever lock for additional protection.

This lock is easy to install--simply slide the ball up into coupler and replace the U-shackle. The UMAX100 fits all of the following couplers and more: 1-7/8" or 2" Fulton, Atwood 2", UFP, Bulldog, 2-5/16" couplers, Fulton Heavy Duty, Surge Brake (reverse mount). Tested to be tough, Trimax offers a lifetime warranty on all of their products.