Usually the backset measures 2 3 8 inches or 2 3 4 inches.
Measuring a cylinder door lock.
How to measure the size of the euro cylinder lock barrel out of the door.
Lay the cylinder down place cylinder on it s side for measuring.
Cylinder door locks are not difficult to replace if you have basic diy skills you only need two measurements.
Measuring for a new cylinder.
The distance between the edge of the door and the center of the lock hole.
2 3 8 inches and 2 3 4 inches.
If you re measuring for a new door you ll need to consider the door s width and any door furniture such as handles or escutcheons.
Your cylinder locks should be as flush as possible with the handles maximum projection is 5mm if you current lock sticks out by more than 5mm either side of the hanldes then choose a smaller size.
They are versatile and most brands will fit any kind of upvc door as well as composite aluminium and patio doors.
Sizes can reversible so for example 40 50 is 50 40 but not in all cases.
Https www locksonline co uk cylinder index html how to measure your lock faq an oval cylinder has an oval shape and is used in conjunction with an oval m.
If you marked the left side of the cylinder with a pencil then.
Remove the euro cylinder if you are unsure see below for instructions on how to remove a euro cylinder lock.
Get measurement a measure from the left end of the cylinder to the centre of the fixing hole.
Do not measure to the end of the black cam ring.
Measure from the outside edge of the door including furniture to the centre of your door.
A the case depth.
Measuring horizontal locks is actually very straight forward.
How to measure a horizontal door lock.
This will show how simple it is using the diagram to the right.
Euro cylinder door locks are the most common lock type in britain today.
They can be fitted to your front and back doors and offer resistance to drilling picking bumping etc.
Before purchasing a lock measure your door s backset cross bore and thickness to ensure you find the right fit.
Measure from the end of the cylinder barrel to the centre of the screw hole each way.
This is dimension a and is called the external size to centre.
The backset is the distance from the edge of the door to the center of the 2 1 8 inch bore hole.