"High-security" gets used loosely in marketing, but there's an actual independent standard behind it, and real mechanical differences that justify the term.
It's Not Just Marketing, There's a Standard
UL 437 is a recognized independent testing standard that evaluates a lock cylinder's resistance to picking, drilling, and prying under controlled conditions. A lock that carries this rating has actually been tested, not just labeled.
What High-Security Cylinders Actually Resist
- Bumping: spool and serrated security pins defeat the bump technique, see our lock bumping explainer
- Picking: sidebar mechanisms and tighter tolerances make manipulation significantly harder
- Drilling: hardened steel inserts resist drill bits that would defeat standard cylinders in seconds
Restricted Keyways
Most high-security systems also use a patented keyway geometry that can only be duplicated by authorized dealers, typically requiring ID or a signed authorization card. See our guide on whether someone can copy your house key for why this matters.
Common High-Security Brands
Medeco, Mul-T-Lock, and Abloy are the names most licensed locksmiths recommend when a client specifically wants this tier of protection.
Do You Actually Need One?
High-security cylinders make the most sense for rental properties with turnover, businesses, higher-value homes, or anyone who's discovered unauthorized key copies were made in the past.
Cost vs. Standard Deadbolts
High-security cylinders cost more upfront than a standard Grade 1 deadbolt, but for the situations above, the restricted-keyway control alone often justifies it.
Curious if a high-security upgrade makes sense for your property? Call 818-249-5128.