Maintenance Work; Checking The Tightness Of Screw Connections - Rohm DURO-M Traduction Du Manuel D'utilisation Original

7 | Maintenance
7.3

Maintenance Work

7.3.1

Checking the Tightness of Screw Connections

If screws are replaced or undone, incorrect replacement or incorrect attach-
ment may lead to dangers for persons and objects. For this reason, for all
holding screws, the tightening torque recommended by the manufacturer of
the screw must be applied in accordance with the screw grade.
For cylinder head screws of the conventional sizes M3 – M24 and strength
classes 8.8, 10.9 and 12.9, the following tightening torque table applies:
Tightening torque in Nm
Strength M3
class
8.8 1.27 3.0 5.9 10.1 24.6 48
10.9 1.79 4.6 8.6 14.9 36.1 71
12.9 2.14 5.1 10 17.4 42.2 83
The table values do not apply to tightening torques expressly specified
elsewhere!
When replacing the original screws, the strength class specified by the
manufacturer is to be observed. In the case of mounting screws for clamp-
ing devices, clamping inserts, top jaws, rigid stops, pre-clamped covers,
equalising weights and comparable elements, strength class 12.9 is always
to be used.
98 / 280
M4 M5 M6 M8 M10 M12 M14 M16 M18 M20 M22 M24
84 133 206 295 415 567 714
123 195 302 421 592 807 1,01
144 229 354 492 692 945 1,19
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B1385260 DURO-M