Operating manual Lubricator
Revision: 02
2022-D064493
en-35
10 Appendix
10.1 Tightening torques for common thread sizes in general mechanical engineering
The specified tightening torques for set screws and nuts are calculated values and are based on the
following prerequisites:
– Calculation according to VDI 2230 (February 2003 edition)
– Coefficient of friction for thread and contact surfaces μ = 0.10
– Utilisation of the elastic limit 90%
Tightening torque [Nm] for threads
Property
class
Screw /
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
Table 4: Tightening torques
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