What is a FAC style security deadbolt?

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It is a security deadbolt fitted on the inner face of the door, usually above the main lock, as a second lock. It takes its name from a very widespread brand, although other manufacturers make similar deadbolts.

It has a thick bolt that goes into a steel keep screwed to the frame. It is opened with a key from outside and with a key or a knob from inside. With two separate locking points, the door stands up much better to levering.

It is one of the most common reinforcements in flats and bungalows, because it is fitted without changing the door or the lock. What matters is that the keep is firmly fixed to the frame and that its cylinder is also a security one.

It is explained in 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.

Related terms

Other questions on this topic

Is a mortice lock or a surface mounted lock better?

It depends on the door. A mortice lock sits inside the leaf and cannot be seen; a surface mounted one is screwed on the inside and is widely used as a second lock. Read the full answer

Should a lock be repaired or is it better to replace it?

It is often worth repairing: an adjustment or a clean is enough. It is replaced when it is broken inside, forced or so old that it does not protect. Read the full answer

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Locks

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