620 - 620 double nightlatch with snib lock-back


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.


Upper bolt deadlocks automatically when door is closed. Snib for locking the upper bolt into lockcase. Lower bolt operated by external lever handle. Internal lever handle retracts both bolts, giving single-action exit at all times.

Bolts are reversible without opening lockcase.

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

Split follower lock.

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

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

Exterior [PROD3] Interior

Upper latchbolt automatically deadlocked. 

Key retracts both latchbolts. Lever handle retracts lower latchbolt.

Lever handle retracts both latchbolts. 

Upper latchbolt held back by snib in faceplate.



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.