How To Measure A Mortice Lock

Selecting the right mortice lock can be difficult if you don't know what to measure and selecting the wrong one can mean that you will have to modify your door to suit it. Please see the below which should assist you with measuring and identifying the right correct replacement mortice lock.

Deadlock	Sashlock
Deadlocks have a single deadbolt (usually operated by the key) and no latch.	Sashlocks have a deadbolt (usually operated by a key) and a latch (usually operated by door furniture)
A Case Depth B Backset C Case Height D Forend Length E Forend Width	A Case Depth B Backset C Case Height D Centres E Forend Length F Forend Width