Backset

Backset is the distance for locks and latches which measures the distance from the edge of the door to the center of the mechanism.

The most common backset in the industry is 60mm. Many locks and latches also come in various backsets. Below are some typical backset that can be found in different mechanisms:

latches – 45mm 60mm & 70mm
deadbolts – 60mm & 70mm
euro mortice locks – 20mm, 25mm, 30mm, 35mm, 45mm, 60mm
commercial mortice locks – 60mm
narrow backset locks for aluminium doors- 23mm 30mm