Breakthrough One-Key Lock Technology (BOLT) has introduced a Off-Vehicle Coupler Lock that secures a trailer when it’s not attached to a vehicle. The Off-Vehicle Coupler Lock features BOLT’s patented one-key lock technology, which permanently programs locks to the vehicle’s ignition key for single-key use no matter how many BOLT locks are being used. The lock is programmed the first time the ignition key is inserted into the BOLT Lock cylinder through the use of spring-loaded plate tumblers that move up and down to uniquely code the cylinder to that specific key.

Made of hardened steel for extra security, the Off-Vehicle Coupler Lock works with 1 7/8-in., 2-in. and 2 15/16-in. couplers to keep a variety of trailers secure while unattended. The BOLT lock is a visible theft deterrent that is designed with a plate tumbler sidebar to prevent picking and bumping. A powder-coated finish is factory applied to the lock to keep dirt and moisture out while protecting the locking mechanism from harsh weather.