SP
+
Appendix
Revision: 03
2022-D033540
en-21
9.4
Tightening torques for common thread sizes in general mechanics
The specified tightening torques for headless screws and nuts are calculated values and are based
on the following conditions:
- Calculation acc. VDI 2230 (Issue February 2003)
- Friction value for thread and contact surfaces
μ
=0.10
- Exploitation of the yield stress 90 %
Tightening torque [Nm] for threads
Property
class
Bolt / nut
M3
M4
M5
M6
M8
M10 M12 M14 M16 M18 M20 M22
M24
8.8 / 8
1.15 2.64 5.24 8.99 21.7 42.7 73.5 118 180 258 363 493
625
10.9 / 10
1.68 3.88 7.69 13.2 31.9 62.7 108 173 265 368 516 702
890
12.9 / 12
1.97 4.55 9.00 15.4 37.3 73.4 126 203 310 431 604 821 1042
Tbl-17: Tightening torques for headless screws and nuts