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How to measure a cylinder lock

There is a large range of sizes of cylinder locks in two main profiles: Euro and Oval. This guide will help you to identify and measure your cylinder lock to ensure you purchase the correct replacement.



See which lock type you have

Firstly, ascertain whether you have a Euro profile or Oval profile cylinder lock. The difference between the two is apparent when looking at the locks face-on.

On the left is an example of a Euro profile lock.  This profile is most likely to be found on UPVC doors.

On the right is an example of an Oval profile lock. The simpler form of this lock means that it is more often found on timber and aluminium doors.


Remove the lock from your door

Please see our separate sheet for step-by-step instructions - and note which of the layouts it matches.

Top: Double cylinder lock - Found on external doors requiring a key on both side

Centre: Half cylinder lock - Found on doors requiring a key on one side only (garage doors, gates etc)

Bottom: Thumb turn cylinder lock - Allow key-free easy exit - ideal for sheltered accommodation, store cupboards etc


Take some measurements

Lie the lock on a flat surface and take the following measurements:

  • A - Left end of cylinder to centre of the fixing hole
  • B - Centre of the fixing hole to the right end of the cylinder
  • C - Total overall length - check A +B is the same
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