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WC mortise locks
The WC room door mortise locks with 8 mm square lever hub do not have keyholes but 2 square holes with a distance of 78 mm.
They are suitable for bathroom and toilet doors, as the WC sets are usually operated from the inside via a turning knob and can only be opened from the outside in an emergency.
Backset (in mm)
Is the distance from the centre of the lever handle or lock cylinder to the front edge of the forend.
Distance dimension
Is measured from the centre of the lever hub or turning knob to the centre of the cylinder recess (keyhole).
This measure is standardized in Germany with the following dimensions:
- 72 mm interior apartment doors
- 78 mm WC - doors
- 92 mm front doors / apartment doors outside
Square spindel
- square spindel 8 mm for room doors
- square spindel 9 mm for fire protection doors
- square spindel 10 mm for external doors
Forend width and length
The forend is the front face of the mortise lock which is visible after installation in the door. The design of forend can be rounded or square.
Door alignment
The DIN direction of the door alignment is also important for the selection of the lock. A distinction is made here between DIN right and DIN left.
If the door hinges are on the left-hand side when observer looks at the closed door, this is a door with a DIN left door,
if the door hinges are on the right side, this is a DIN right door.
