What is an anti-bump cylinder?

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An anti-bump cylinder is a cylinder built to resist bumping, a technique used to open basic cylinders with a doctored key and sharp taps.

The problem with bumping is that it is quick and leaves almost no marks. The door looks untouched, and that also makes things harder with the insurance. Many basic cylinders, the ones fitted as standard in plenty of homes, have no defence against it at all.

An anti-bump cylinder has an inner design that stops those taps from setting the parts in place, so the technique does not work.

Bear in mind that anti-bump protects against one particular kind of attack. If your cylinder sticks out from the door, it should also be anti-snap or have an escutcheon. We tell you more in security cylinders.

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Security lock cylinders

What an anti-bump, anti-pick, anti-snap and anti-pull cylinder is, how to read its security grade and how to choose the right one for your door.

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Other questions on this topic

How do I know what size cylinder my door has?

It is measured from the centre of the fixing screw, on the edge of the door, to each end. If both sides are equal it is symmetrical; if not, it is offset. Read the full answer

What is lock snapping and how is it prevented?

It is breaking the cylinder at its weakest point when it sticks out of the door. It is prevented with an anti-snap cylinder of the right size and an escutcheon that covers it. Read the full answer

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Lock cylinders

Everything people usually ask about the lock cylinder: when to change it, how to measure it, what protection it has and how to look after it on the coast.

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