640 - 640 escape sash lock


Locks for doors where unrestricted exit at all times is required. Suitable for classrooms, offices, industrial premises, doors to flats and apartments, hotel bedrooms and commercial premises.

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.

Split follower locks incorporate different and separate functions on either side of the door.

For finishes, handing and dimensions see Lockcases Information appendix.

When ordering please specify hand, direction of door opening and door thickness.



Hardened steel hookbolt thrown 23.5mm by 90° turn of key or thimbturn. latchbolt deadlocks automatically when door is closed.

Latchbolt operated by extrernal leverhandle. Internal lever handle retracts both bolts, giving single-action exit at all times.

Latchbolt reversible without opening lockcase.

Key can be removed in locked or unlocked position.

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

Option of MA microswitch to monitor bolt deadlocking and bolt withdrawn.

Exterior [PROD3] Interior

Key operates hookbolt and latchbolt. Lever handle retracts latch. Latchbolt automatically deadlocked.

Turn operates hookbolt and latchbolt. Lever handle retracts both hookbolt and latchbolt.



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


Please note that when specifying split follower locks it is important to state the direction of door opening as well as the handing.