Lock bumping has long been a strategy used by locksmiths to get people back into their homes or businesses when they’ve been locked out. Unfortunately, this same strategy inevitably made its way into the hands of thieves and burglars.
Lock bumping requires what’s known as a “bump key.” These specialized keys are produced by lock manufacturers for use by locksmiths, but enterprising burglars have also figured out how to file their own bump keys out of blank keys.
The burglar puts the bump key into a deadbolt lock and taps on the key with a hammer while making incremental turns towards unlocking it, which gradually drops the pins in place to allow the door to be unlocked.
The bump strategy works on most current standard residential pin-and-tumbler locked doors.
Some bump proof locks are designed with abnormally shaped keys so a burglar with a traditional bump key won’t be able to use the strategy on the lock. Digital and biometric entry systems that do not have a backup key slot are also bump and pick proof by their very nature. However, many modern digital locks do have that backup key slot which often leaves it vulnerable to traditional bumping and picking strategies.
Dixie Safe & Lock Service Inc. also installs BumpGuard locks that utilize a side-locking bar rather than the pin-and-tumbler mechanism used in traditional deadbolt locks. These too will provide protection from a burglar with a key ring of 10 or so bump keys, which in most cases grants the burglar access to about 90 percent of residential deadbolts.