Likewise, how do you measure a backset on a mortise lock?
The backset measurement is the distance from the centre of the keyhole, to the leading edge of the lock. This is very important when replacing locks because you don’t want to have to drill new holes if you can help it!
Also Know, what is backset on a mortice lock? ‘Backset‘ is the distance from the front of the lock to the centre of the spindle as shown here. Almost ALL domestic mortice locks and tubular latches are supplied with either a 44mm or 57mm backset length.
Similarly, you may ask, how do you measure a UPVC door lock?
It is possible to measure a door cylinder in the door, but to be sure it’s best to remove it first. Measurement A – Measure from one end of the cylinder to the middle of the central screw hole (e.g. 40mm). Measurement B – Measure from the other end to the middle of the central screw hole (e.g. 45mm).
Are mortise locks a standard size?
Mortice locks are installed inside the door, and there are a range of sizes, security levels and functions which you need to consider before you make your purchase. If the distance is 45mm you will need a 64mm/2.5″ mortice lock, If the distance is 57mm you will need a 76mm/3″ mortice lock.