Union Strongbolt 3 Lever Mortice Sash Lock

This polished brass variant features a 68mm case size with a 45mm backset, making it perfectly suited for doors where the lock needs to be positioned closer to the door edge. The polished brass forend finish provides an attractive, traditional aesthetic that complements classic door furniture and handles. With its 57mm centre measurement from follower to keyhole, this configuration offers reliable operation in standard residential and light commercial applications. The 45mm backset is particularly advantageous for narrower door stiles or retrofit installations where space is limited. The Union SwitchLatch technology allows the radius latch to be reversed without tools, whilst the anti-rattle adjustable strike ensures smooth, quiet operation. The chamfered bolt design and anti-pick protection deliver robust security, with hardened steel pins resisting sawing attacks. The 14mm deadbolt can be operated by key from either side for secure positive deadlocking.