Appendix; Tightening Torques For Common Thread Sizes In General Mechanical Engineering - Wittenstein cyber dynamic system Operating Manual

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cyber dynamic system

10 Appendix

10.1 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 in accordance with VDI 2230 (February 2003 version)
- 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.
Property class of
screw/nut
A2-70
Property M3
class
12.9
2.15
Revision: 01
M1.6
0.109
Tightening torque [Nm] with thread
M3.5 M4 M5 M6
3.3 4.95 9.7 16.5
Doc. no.: 5022-D056658
Tightening torque [Nm] with thread
M2 M2.5
0.227 0.460
Table 16: Tightening torques for set screws and nuts
M8 M10 M12 M14 M16 M18 M20 M22 M24
40 81 140 220 340 470 660 890 1140
Operating manual
M3 M4
0.806 1.86
Table 17: Tightening torques
M5
3.68
en-41