The backset is the distance from the edge of the door to the center of the 2 1 8 inch bore hole.
Measuring a cylinder door lock.
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.
Lay the cylinder down place cylinder on it s side for measuring.
If you marked the left side of the cylinder with a pencil then.
This will show how simple it is using the diagram to the right.
Security brands such as yal.
They are versatile and most brands will fit any kind of upvc door as well as composite aluminium and patio doors.
How to measure the size of the euro cylinder lock barrel out of the door.
How to measure a horizontal door lock.
Measuring for a new cylinder.
Measuring horizontal locks is actually very straight forward.
A the case depth.
Cylinder door locks are not difficult to replace if you have basic diy skills you only need two measurements.
Remove the euro cylinder if you are unsure see below for instructions on how to remove a euro cylinder lock.
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.
In the united states there are two common backsets for residential door locks.
Get measurement a measure from the left end of the cylinder to the centre of the fixing hole.
The distance between the edge of the door and the center of the lock hole.
Do not measure to the end of the black cam ring.
This is the overall depth or length if you like of the horizontal lock body.
Euro cylinder door locks are the most common lock type in britain today.
2 3 8 inches and 2 3 4 inches.
This is dimension a and is called the external size to centre.
Measure from the end of the cylinder barrel to the centre of the screw hole each way.
Before purchasing a lock measure your door s backset cross bore and thickness to ensure you find the right fit.
Usually the backset measures 2 3 8 inches or 2 3 4 inches.