TESTit
Measuring device
Order h49 7144.907-333
57
Metric control threads
The following table contains the guide values in Nm for screw
tightening torques for achieving the highest permitted pre-
load for metric control threads.
Total friction coefficient
𝜇
𝑔𝑒𝑠
= 0.12
Thread designa-
tion
Tightening torque at screw quality
[Nm]
10.9
12.9
M4
4
5
M5
7
9
M6
12
15
M8
25
38
M10
50
70
M12
100
130
M16
220
300
M20
400
550
M24
600
800
Table 11: Screw tightening torques, metric control threads
Aluminum components
The following table contains the reduced screw tightening
torques for securing aluminum components.
Thread designa-
tion
Tightening torque
[Nm]
Minimum screw
depth [mm]
M6
10
12
M8
23
16
M10
46
20
Table 12: Screw tightening torques for aluminum components