Why euro cylinders get targeted
Lock snapping exploits a weak point in a standard euro cylinder. This is 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, which exposes the mechanism and lets someone open the door without a key.
The method is quiet and quick, and it needs no forcing of the frame or breaking of glass. That is part of why attackers choose it. An anti-snap cylinder resists this attack because a sacrificial section absorbs the snapping force. The core mechanism stays intact, so the door stays shut even if the cylinder takes an attack.
TS007 3-star and SS312 Diamond, explained
TS007 is the British kitemark rating for cylinder security on uPVC and composite doors. A cylinder is rated 1 star or 3 star, while 2 stars applies to security handles and escutcheons. A 3-star cylinder meets the standard on its own. A 1-star cylinder with 2-star handles reaches the same 3-star protection, as Secured by Design explains. This matters if you upgrade your handles but not the cylinder.
SS312 Diamond is a separate, independently tested standard with similar resistance to snapping, drilling, bumping and picking. A TS007 3-star or an SS312 Diamond cylinder generally meets current anti-snap standards. Many insurers now expect one on a uPVC or composite door.
Our guide explains how anti-snap cylinder ratings work in more detail. It covers the star system, the Diamond mark and how to measure a cylinder.
Fitting an upgrade
On most doors the euro cylinder is a separate part from the multipoint mechanism. A single fixing screw through the door edge holds it. An upgrade does not usually touch the mechanism, handles or keeps. The locksmith measures the old cylinder to get the right length, because sizes suit the door thickness and handle setback.
The wrong length causes trouble. A cylinder that sticks out gives an attacker something to grip, while one that sits too deep is hard to turn. Once the length is right, the locksmith fits the new cylinder and tests it.
If the mechanism is faulty as well, read our uPVC door lock repair page. A door that will not lock may have a worn gearbox, not a cylinder fault. Our guide on why a uPVC door won’t lock helps you tell the two apart.
Who this matters most for
Anyone with a uPVC or composite front door and a standard, unrated cylinder is a candidate for this upgrade. It is also a common addition after a lock change, after a burglary repair, or when you review an older door’s security.
The upgrade costs little compared with a full lock or door replacement, yet it adds a lot. For that reason, we often pair it with a wider check of the door’s security fittings, such as handles, hinges and keeps. A strong cylinder in weak hardware still leaves a gap.
What to expect from the visit
The locksmith checks the existing cylinder for a rating mark and measures it against the door. Then the locksmith confirms which anti-snap cylinder fits before ordering anything. Fitting is quick once the right cylinder is on hand, so most visits finish within the hour. That includes 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 your details through the contact form. A mobile locksmith covering Bayswater and nearby W2 districts will confirm the right cylinder and the price on the day.