Lockwood Synergy® 3541 Hook Bolt and 3542 Swing Bolt Short Backset Mortice Lock

Short backset, swing-bolt deadlocks suitable for narrow stile sliding and swing doors. Positive action deadbolt is hooked to engage and lock into a latching or security strike when the bolt is in the thrown position (3541 only). Deadbolt is locked or unlocked by either key, turnknob, escape turn or handle.

All 3540 Series Cylinder Mortice Locks are built of the finest materials, with the easy action and solid feel of the world’s finest locks.