14.3 Tightening torques
General tightening torques
The recommended tightening torques for the screw connections are listed
below. In justified individual cases, different tightening torques - which are
then stated in the respective assembly drawings (and have to be complied
with), may be necessary - see diagrams in the original scale (→ part 3 of the
documentation).
The tightening torques given here apply to unlubricated steel setscrews
with head contact dimensions as in DIN 912, 931, 933, 934/ISO 4762,
4014, 4017, 4032, etc.
Setscrews, metric coarse-pitch thread DIN 13, Part 13
Dimension Width across flats
(mm)
Screw tightening torque M
A
(Nm)
Strength class 8.8 Strength class 10.9 Strength class 12.9
M4 7 3.0 4.4 5.1
M5 8 5.9 8.7 10
M6 10 10 15 18
50-020-1011-900_EN
1.0 - © 2/15/2017
280
14 Appendix
14.3 Tightening torques
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