Measuring horizontal locks is actually very straight forward.
Measuring a cylinder door lock.
Get measurement a measure from the left end of the cylinder to the centre of the fixing hole.
In the united states there are two common backsets for residential door locks.
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.
Usually the backset measures 2 3 8 inches or 2 3 4 inches.
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.
How to measure a horizontal door lock.
The distance between the edge of the door and the center of the lock hole.
This is dimension a and is called the external size to centre.
Measure from the outside edge of the door including furniture to the centre of your door.
Lay the cylinder down place cylinder on it s side for measuring.
Before purchasing a lock measure your door s backset cross bore and thickness to ensure you find the right fit.
Measuring for a new cylinder.
They can be fitted to your front and back doors and offer resistance to drilling picking bumping etc.
This is the overall depth or length if you like of the horizontal lock body.
A the case depth.
How to measure the size of the euro cylinder lock barrel out of the door.
Remove the euro cylinder if you are unsure see below for instructions on how to remove a euro cylinder lock.
The backset is the distance from the edge of the door to the center of the 2 1 8 inch bore hole.
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.
Security brands such as yal.
Sizes can reversible so for example 40 50 is 50 40 but not in all cases.
If you marked the left side of the cylinder with a pencil then.
Euro cylinder door locks are the most common lock type in britain today.
Do not measure to the end of the black cam ring.
Measure from the end of the cylinder barrel to the centre of the screw hole each way.
They are versatile and most brands will fit any kind of upvc door as well as composite aluminium and patio doors.