Why euro cylinders get targeted
Lock snapping exploits a weak point in a standard euro cylinder — the type fitted in most uPVC and composite front and back doors. A firm, sharp force snaps the cylinder at its narrowest point in seconds, exposing the mechanism inside and letting the door be opened without a key. It’s a quiet, quick technique that doesn’t need forcing the frame or breaking glass, which is part of why it’s targeted the way it is. An anti-snap cylinder is built specifically to resist this: a sacrificial section absorbs the snapping force while the core mechanism stays intact, so the door does not open even if the cylinder is attacked.
TS007 3-star and SS312 Diamond, explained
TS007 is the British kitemark rating for cylinder security on uPVC and composite doors, rated from 1 to 3 stars. A cylinder rated 3-star meets the standard on its own. A 1-star cylinder combined with 2-star rated door handles and escutcheons reaches the same overall protection, which matters if you’re upgrading handles rather than the cylinder.
SS312 Diamond is a separate, independently tested standard covering similar resistance to snapping, drilling, bumping and picking. Either a TS007 3-star or an SS312 Diamond cylinder is generally treated as meeting current anti-snap standards. Many insurers now expect one on a uPVC or composite door.
Fitting an upgrade
On most doors the euro cylinder is a separate component from the multipoint mechanism, held by a single fixing screw through the edge of the door. Upgrading it does not usually mean touching the mechanism, handles or keeps. A locksmith measures the existing cylinder to get the correct length — cylinders are sized to the door thickness and handle setback. The wrong length either protrudes, giving an attacker something to grip, or sits recessed and hard to turn.
Once the correct length is confirmed, the replacement is fitted and tested. If the mechanism itself is also faulty rather than the cylinder alone, that’s covered on the uPVC door lock repair page.
Who this matters most for
Anyone with a uPVC or composite front door fitted with a standard, unrated cylinder is a candidate for this upgrade. It’s a common addition after a lock change, after a burglary repair, or on review of an older door’s security.
It’s a relatively low-cost, high-value upgrade compared with a full lock or door replacement. For that reason, it’s often bundled with a wider check of the door’s security fittings — handles, hinges and keeps — since a strong cylinder in weak surrounding hardware still leaves a gap.
What to expect from the visit
The locksmith checks the existing cylinder for a rating mark, measures it against the door, and confirms which anti-snap cylinder fits before ordering anything. Fitting itself is usually quick once the correct cylinder is on hand — most visits are done within the hour, including the check on handles and keeps.
Upgrade your cylinder
To have your euro cylinder checked and upgraded to an anti-snap rated one, get in touch. request a call back or send the details through the contact form, and a mobile locksmith covering Bayswater and neighbouring W2 districts will confirm the right cylinder and price on the day.