234 - 234 nightlatch with key lock-back


Locks for exit doors offering a high degree of security, but with unrestricted exit in an emergency. Ideally suited for hotels, factories, hospitals, schools, offices etc. Also suitable for use with electric strikes.

Available with double or single cylinder.

Supplied as standard with striking plate.

Cylinder and accessories bolt through lockcase for added strength.

Key can only be removed in locked position.

For finishes and dimensions see Lockcases Information appendix. For accessory configurations see Variations insert.

When ordering please specify hand and door thickness.


Bolt deadlocks automatically when door is closed. Key for locking bolt into lockcase. Bolt reversible without opening lockcase.

Suitable for use with lever handle.

Available with 35mm, 50mm or 70mm backset.

Optional microswitches: MC microswitch monitors bolt deadlatching, use of cylinder/thumbturn and use of handle MD microswitch monitors lock-back.


Product has been successfully type-tested for conformity to BS EN 12209.
Regular audit testing is undertaken.