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Appendix
Revision: 04
5022-D029179
en-23
9.1 Tightening torques for common thread sizes in
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9
Appendix
9.1
Tightening torques for common thread sizes in general mechanical engineering
The specified tightening torques for headless screws and nuts are calculated values and are based
on the following conditions:
- Calculation according to VDI 2230 (edition 11/2015)
- Friction value for thread and contact surfaces µ=0.10
- Utilization of the yield stress 90%
- Torque tools type II classes A and D in accordance with ISO 6789
The settings are values rounded to usual commercial scale gradations or settings.
Use the
exact
values in this table to set your tools.
Tightening torque [Nm] with thread
Property class
Screw / Nut
M1.6
M2
M2.5
M3
M4
M5
A2-70
0.109
0.227
0.460
0.806
1.86
3.68
Tbl-8: Tightening torques for headless screws and nuts
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