Yale Lockmaster AutoEngage gearboxes look quite different to regular Lockmaster gearboxes and measure only 201mm high. The top of the gearbox is 82mm from the spindle and the gearboxes feature a groove to accept bolt through fixings.

The AutoEngage gearbox is available in 45mm or 55mm backsets and is designed for use on timber and composite doors.

Gearboxes are attached to faceplates with 3 screws and cannot be interchanged with other lockmaster locks.

When measuring the backset, allow 2-3mm for the faceplate, so a 28mm backset gearbox will measure 25mm when not fixed to the strip.

This is the automatic locking version of the lockmaster gearbox. Suits regular and heritage locks.

We stock a range of associated products for Lockmaster AutoEngage gearboxes, including multipoint door locks, keeps, spindles, handles and accessories.

To lock the door

1. On closing the door, the latch and locking points are automatically engaged as the triggers on the door connect with the keeps on the frame.

2. Turn the key to deadlock the mechanism.

To unlock the door

1. Turn the key to unlock the mechanism.

2. If you have a lever, push the lever down to retract the locking points. Alternatively, a further quarter turn of the key will retract the latch to open the door.