The Bump Key Threat: What Homeowners Should Know

You may never have heard the term "bump key." It's well known among people looking to get through a locked door quickly and quietly.

A bump key is cut from a standard blank. Combined with a sharp strike and light turning pressure, it can pop the pins in most ordinary pin-tumbler locks in a matter of seconds. That's the same type of lock sold in nearly every hardware store. No picks, no drilling, no visible damage. The technique takes very little practice to learn, and instructions on cutting and using bump keys are widely available online.

Why it's a real problem

Because bump keys work on such a wide range of common residential hardware, a huge share of homes are more exposed than their owners realize. The attack leaves little to no evidence of forced entry, which also complicates insurance claims after a break-in.

What actually stops it

• High-security cylinders (Medeco, Mul-T-Lock, Schlage Primus) use mechanisms bump keys can't manipulate
• Security pins and sidebar designs add resistance standard pin-tumbler locks don't have
• Grade 1 or Grade 2 rated hardware, paired with a bump-resistant cylinder, closes both the strength and the picking/bumping gap

If your home still has the original builder-grade locks, a rekey with bump-resistant cylinders is inexpensive relative to the exposure it closes.