How to Measure a Nightlatch Lock
Simple steps required to measure a nightlatch rim lock.
A - Case Depth
B - Backset
C - Case Height
D - Case Depth
E - Handle Projection
Lock measurements are critical when specifying new locks or replacing like for like, common sizes for nighlatch locks as follows;
Standard Width - 90mm case Size - 60mm Backset
Narrow Width - 60mm Case Size - 40mm Backset
Other nigtlatch sizes are important but not critical, these include Case Height and Depth