Lockmaster gearboxes are available in 35mm or 45mm backsets with either a double spindle or single spindle mechanism. Bifold door versions of the gearbox are available in 25mm and 28mm backsets.
Double spindle locks feature 62mm and 92mm centres and are unsprung, so we recommend the use of sprung door handles. They can be used as lift lever or double spindle night latch function. Single spindles are sprung and can only be used as a lift lever function.
Lockmaster gearboxes measure 228mm high by backset +15mm. The latch measures 30mm high, as does the deadbolt. There is 65mm between the bottom of the latch and the top of the deadbolt.
Gearboxes are fitted to faceplates with 3 screw holes. The top to middle screw hole measures 109mm and the middle to bottom also measures 109mm.
Earlier versions of these gearboxes also had a small spindle hole at the top of the case, near the latch. This was used to hold the latch back.
45mm versions of the Lockmaster gearbox are the same as the 35mm version but feature an extended latch and deadbolt and a cover plate to convert the lock to a 45mm backset.
We stock a range of associated products for Lockmaster Standard gearboxes, including multipoint door locks, keeps, spindles, handles, and accessories.
Operation: Lift Lever or Double spindle
Latch reversal: Undo the screw in the latch to remove it. Reverse and reinsert then replace the screw.
To lock the door
1. On closing the door, the latch is automatically engaged.
2. Lift the handle up to engage the additional locking points.
3. Throw the deadbolt and lock the system by turning the key (on some brands, the deadbolt will be thrown by lifting the handle).
To unlock the door
1. Unlock the system by turning the key.
2. Push the handle downwards to disengage the locking points.
3. A further quarter turn of the key will retract the latch.