Rim lock

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A rim lock is one that is screwed onto the inside face of the door instead of being set into its edge. From the outside only the cylinder shows; the case is visible on the inside and its bolt goes into a strike plate fixed to the frame.

It is widely used as a second lock, on metal doors, storeroom or patio doors, and on timber doors that are too thin to take a mortice case. As it does not weaken the door leaf, it can take thicker bolts.

What decides how strong it is comes down to the fixing: bolts that go right through the door and a strike plate firmly anchored to the frame. A rim lock held on with short screws will come off with one kick. If you are thinking of adding one, see lock installation or security deadbolts.

Related service

Security lock installation

Installation of new security locks, mortice or surface-mounted, chosen according to the door, the frame and how you use it.

Related terms

Questions that mention it

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

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