Master Lock’s BumpStop™ Cylinder Technology

As a world leader in security hardware, Master Lock Company has stepped forward to create a revolutionary new lock cylinder that is 4 times more bump resistant than the toughest proposed industry standard.

Bumpstop™ 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 tranfer of force from the bump key to the pins and blocks rotation of the cylinder - so the lock stays locked.