Buying Guide Do I need an Anti-Snap Cylinder?

Our security experts' guide to anti-snap locks will explain how British Standard anti-snap cylinders offer increased protection against cylinder lock snapping and other attempts to access your property.


Some cylinders are quite easy to snap, and burglars know how to target the weakest point to break into a house. So it's worth making sure you're well protected.

Standard lock


The weakness of a standard cylinder is the screw hole that secures the cylinder in your door. If a cylinder sticks out further than 5mm (see measuring a cylinder) from the edge of your door, someone could apply force, snap it and expose the locking mechanism, making entry easy.

Standard cylinder
Anti-Snap lock


An Anti-Snap cylinder has a line cut into the cylinder body, known as a sacrificial snap line. When force is applied, the cylinder snaps at this 'weak point' but the actual mechanism stays intact. The sacrificial snap line must face the outside of your door.

Anti-Snap cylinder

If you want the best security available, choose cylinders with the TS007 Kitemark.

An alternative is to strengthen the cylinder by running a laminate or steel core through the entire body of the cylinder. This makes it virtually impossible to snap.

An advantage with this type of cylinder is that either side can face the outside of your door.

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