Mul-T-Lock

Founded in 1973 and now trusted across more than 70 countries, Mul-T-Lock is the benchmark for high security locking in residential, commercial, and institutional applications. The brand built its reputation on a patented telescopic pin-within-a-pin cylinder mechanism that creates two simultaneous shear lines rather than one, making conventional picking techniques exponentially more difficult than on standard pin tumbler locks. Hardened steel inserts protect against drilling at every vulnerable point, and the restricted keyway system means key blanks are not available on the open market and cannot be duplicated without your unique authorization card and photo ID. Mul-T-Lock products are UL437 listed for burglary resistance and certified to ANSI Grade 1, the highest rating issued by American testing standards, and are backed by a limited lifetime mechanical warranty. From the flagship Hercular deadbolt and the MT5+ high security cylinder platform to padlocks, mortise locks, and electronic access control, every product in the Mul-T-Lock lineup is engineered for one purpose: to hold.