Fig. 3: Lock Cylinder - HomeMatic HM-Sec-Key Mounting Instruction And Operating Manual

cylinder dimension) are important. In each case, measure from the fastening screw of
the cylinder in the lock fitting (including the door fittings (M)) and add 8 - 15 mm (ideally
10 mm) to the inside dimension to calculate the suitable standard dimensions.
Example: You measure an outside dimension (2) of 40 mm and an inside dimension
(1) of 40 mm as well. Therefore, the cylinder is a 40/40 cylinder. In order to use the
KeyMatic drive, you therefore need the next standard size, a 40/50 cylinder. The cylin-
der will then protrude inside by 10 mm (3).
Fig. 3: Lock cylinder
K – Inside door fitting
L – Rosette
M – Screw for fastening the lock cylinder in the mortise lock
N – Lock cylinder
K
N
dimension
inside dimension
additional distance
inside outside
dimension
+
Mounting
L
M
Q
33