Anti-Snap Locks Explained
Written by Cornwall Composite DoorsReviewed by Cornwall Composite Doors installersLast updated July 20265 minute read
Short answer
Anti-snap locks are euro cylinders designed with a weak sacrificial point and internal reinforcement so that when a burglar snaps the exposed section, the internal locking mechanism stays intact. Look for a TS007 3-star rating, or a 1-star cylinder combined with 2-star security hardware.
Lock snapping became one of the most common UK burglary methods over the last decade. This article explains how it works and how anti-snap cylinders were developed to counter it.
What is lock snapping?
Standard euro cylinders have a narrow point close to the fixing screw. Lock snapping exploits this by gripping the exposed outer section of the cylinder with mole grips or a similar tool and applying sharp force, snapping it clean off at the weak point in seconds. Once snapped, the mechanism can often be manipulated to retract the bolts.
The attack requires no drilling, no lock picking skill and very little noise, which is what made it so popular with opportunist burglars once the technique became widely known online.
How anti-snap cylinders defend against it
Anti-snap cylinders are built with a deliberate sacrificial break point away from the internal locking components, so when force is applied the cylinder snaps but the mechanism controlling the bolts stays connected and secured. Many also include hardened steel pins and anti-drill plates to resist other attack methods at the same time.
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The TS007 star rating system
TS007 is the British Standards Institution kitemark scheme rating cylinders from one to three stars for snap resistance, with three stars offering the highest protection. Door hardware such as handles and escutcheons can also carry a two-star rating for physical protection of the cylinder itself.
- 3-star cylinder alone: full protection
- 1-star cylinder + 2-star hardware: equivalent protection
- No rating: vulnerable to snapping in seconds
Checking what's fitted to your door
The cylinder is a separate component from the door itself, so even a well-built composite door can be let down by a basic cylinder fitted at installation, or a downgraded one during a later handle replacement. Check the cylinder face for a kitemark stamp or ask your installer to confirm the star rating in writing.
Frequently asked questions
Can I replace a euro cylinder myself?
Yes, it's a straightforward job for most competent DIYers: measure the cylinder from centre to each end, buy a matching TS007 3-star replacement, remove the retaining screw, and swap it. If you're unsure, a locksmith can do it quickly and confirm the new cylinder is correctly seated.
Do all new composite doors come with anti-snap cylinders?
Reputable manufacturers fit TS007-rated cylinders as standard because PAS 24 testing requires it, but budget doors or older stock may not. Always ask your installer to confirm the exact cylinder brand and star rating in the written specification before you sign off on an order.
Is lock snapping still common in Cornwall?
Lock snapping declined nationally as anti-snap cylinders became standard, but it remains a known risk on older doors with unrated cylinders. Rural and holiday-let properties that see infrequent occupation are still worth checking, since older doors are more likely to have outdated hardware fitted.
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- How Secure Are Composite Door Locks?The lock is arguably the most important security component on a composite door. Here's what determines how secure it really is.
