Maintenance
286
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13.5 Tightening torques
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Tightening torque MA in Nm (unless
otherwise indicated).
A = Thread size
(the stability class can be seen on the head of the
screw).
A Ø
5.6 6.8 8.8 10.9 12.9
M
A
(Nm)
M 4
2.2 3 4.4 5.1
M 5
4.5 5.9 8.7 10
M 6
7.6 10 15 18
M 8
18 25 36 43
M 10
29 37 49 72 84
M12
42 64 85 125 145
M14
100 135 200 235
M14x1.5
145 215 255
M 16
160 210 310 365
M16x1.5
225 330 390
M 20
425 610 710
M 24
730 1050 1220
M 24x1.5
350
M 24x2
800 1150 1350
M 27
1100 1550 1800
M 27x2
1150 1650 1950
M30
1450 2100 2450
NOTE
The table above does not apply to countersunk screws with hexagonal socket in case the
countersunk screw is tightened via hexagonal socket.
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Note
Regularly check that nuts and bolts are tightly in place (approx. every 50 hours) and tighten
them if necessary.
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