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