Lock bumping is a lock-picking technique that uses a specially cut bump key and striking force to quickly open pin tumbler locks. Most standard residential locks are vulnerable to this method.
How Lock Bumping Works
A bump key is cut so all its cuts are at maximum depth. When inserted into a lock and struck with a tool, the force transfers to the bottom pins, momentarily separating them from the top pins at the shear line. A slight turning force applied to the key allows the cylinder to rotate, unlocking the door.
Why It is Concerning
- Bump keys are easy to make or purchase
- The technique requires minimal skill
- Most standard locks are vulnerable
- Bumping leaves little or no evidence
Protecting Against Bump Attacks
Bump-Resistant Locks
Modern high-quality locks include features that resist bumping:
- Security pins (spool, serrated, or mushroom pins)
- Sidebar mechanisms
- Electronic/smart locks with no traditional cylinder
Recommended Brands
Look for locks specifically marketed as bump-resistant from manufacturers like Schlage, Medeco, Mul-T-Lock, and Kwikset SecureKey.
