Security deadbolt

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A security deadbolt is a second lock screwed onto the inside face of the door, usually above the main one, with a thick bolt that goes into a steel strike plate on the frame. It is worked with a key from outside and with a key or a thumbturn from inside.

It adds another locking point, separate from the main lock, and forces anyone trying to get in to beat two different mechanisms. It is a direct way of improving a door without changing the lock it already has.

Its strength depends on the fixing: bolts that go right through the door leaf and a strike plate firmly fixed into the wall. You can also ask for its cylinder to be keyed alike with the lock’s so you only use one key. You will find it under security deadbolts.

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Security deadbolts

Fitting of surface mounted security deadbolts with a cylinder, as a second lock on front doors, patios, storerooms and shops.

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Questions that mention it

What is a FAC style security deadbolt?

It is a surface mounted security deadbolt fitted on the inner face of the door, usually above the lock, as a second lock. Read the full answer

Can I fit a second lock on my door?

Yes. The most common option is a security deadbolt above the main lock, which adds a second locking point without changing the door. Read the full answer

How is a storeroom door protected?

With a surface mounted security deadbolt, a protected cylinder and, if the hinges are on the outside, anti-jemmy reinforcement on that side. Read the full answer

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