BumpStop^® Cylinder Technology

As a world leader in security hardware, Master Lock Company stepped forward to design a lock cylinder mechanism that exceeds ASTM Grade 6 requirements.

BumpsStop employs an innovative, patent pending design which utilizes a unique reverse rake tapered driver pin, high performance springs and tightly machined cylinder chambers. During a bump attempt, this solution prevents the transfer of force from the bump key to the pins and blocks rotation of the cylinder — so the lock stays locked.