The torque to tighten the screws or nuts
depends on their size.
The tightening torques in the following
table [Nm] should be considered as a
guide, because in practice the coefficient
of friction may vary substantially. The
following data are based on
a coefficient of friction of 0.1-0.14.
Tighten the screws or nuts to the
specified torque.
Nominal Friction
Tightening torque in Newton meters for screw
strength grade
size coefficient
µ 5.6 6.9 8.8 10.9 12.9
M 3
0.1 0.5 0.8 1 1.5 1.8
0.14 0.6 1 1 1.9 2.2
M 4
0.1 1.2 1.9 2 3.3 4
0.14 1.4 2.3 3 4.1 4.9
M 5
0.1 2.3 3.6 5 7 8
0.14 2.8 4.5 6 8.5 10
M 6
0.1 3.9 6.3 8 12 14
0.14 4.8 7.7 10 14 17
M 8
0.1 9.5 15 20 28 34
0.14 12 19 25 35 41
M10
0.1 19 30 40 56 67
0.14 23 37 49 69 83
M12
0.1 33 52 69 98 115
0.14 40 65 86 120 145
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