231 - 231 nightlatch with key lock-back


Locks for entrance doors where automatic locking is required when door is closed.

Available with single cylinder and thumbturn, or alternatively with double cylinders or single cylinder only.

Supplied as standard with striking plate.

Cylinder and accessories bolt through lockcase for added strength.

Key can only be removed in locked (or locked-back) position.

For finishes and dimensions see Lockcases Information appendix.

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.

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


Latchbolt automatically deadlocked. 

Key retracts latchbolt.


Turn retracts latchbolt.

Latchbolt held back by key in faceplate.



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