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STD−Wa 08/0075 71099235Screw Connections, Filling of Gaps, Sealing Material and Product Recommendations
1 Screw Connections
Tightening torques
It is unconditionally required to apply the tightening
torques stated in the construction drawings and in the
manual.
If no tightening torques are stated then the values
indicated in the following table are valid, depending on
thread size and property class.
NOTE
The coefficients of friction for rust−proof screws usually
are a little bit higher. Given that these are always slightly
oiled or screwed down with bonding material
(corresponds to slightly oiled), a total coefficient of
friction of m
ges
=0.13 was chosen.
Size
Tightening torque MA (Nm)
Property class Property class
8.8 10.9 12.9 A4−70 A4−80 C3−80
M 4 2.8 4.1 4.8 2.2 2.9 3.1
M 5 5.5 8.1 9.5 4.3 5.7 6.1
M 6 9,5 14 16.5 7.3 9.8 10.4
M 7 15.5 23 27 12 16 17
M 8 23 34 40 17 23 25
M 10 46 68 79 35 48 51
M 12 79 117 135 60 82 87
M 14 125 185 215 98 130 140
M 16 195 280 330 150 200 215
M 18 280 390 460 210 280 300
M 20 390 560 650 300 405 430
M 22 530 750 880 225 545 580
M 24 670 960 1120 260 695 740
M 27 1000 1400 1650 430 1030 1100
M 30 1350 1900 2250 585 1400 1500
M 33 1850 2600 3000 1875 2000
M 36 2350 3300 3900 2450 2600
M 39 3000 4300 5100 3190 3400
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