Electric motors Size 63 - 225 ATEX / IECEx
Maintenance
2021-05-31
53
9.4.2 Screw connections, property class 8.8 and A4-70
NOTE!
Only use tightening torque values for screws of
property class 8.8 and A4-70 (A4-80) in high-
strength parts (e.g. grey cast iron, steel).
Thread
Tightening torque
value [Nm]
Thread
Tightening torque
value [Nm]
M 4
2.3
M 14
105
M 5
4.6
M 16
160
M 6
7.9
M 20
330
M 8
19
M 24
560
M 10
38
M 30
1100
M 12
66
M 36
1900
9.4.3 Screw connections of property class 5.6
NOTE!
Only use tightening torque values for screws of
property class 5.6, 4.6 A2 or for screws in low-
strength parts (e.g. aluminium).
Thread
Tightening torque
value [Nm]
Thread
Tightening torque
value [Nm]
M 4
1.1
M 14
49
M 5
2.1
M 16
75
M 6
3.7
M 20
150
M 8
8.9
M 24
260
M 10
18
M 30
520
M 12
30
M 36
920
Pos : 9. 30 /KN 2006-SM /nL---------- Abschnitts ende ---------- @ 8\ mod_1141997892953_0.doc @ 75471
