MTU 8V4000M*3 series, Operating Instructions Manual

Page: 43 / 260

Tightening torque for self-locking hex nuts
Thread
M
A
(Nm)
Lubricants
M6 7.5 +1 –
M8 17 +2 –
M10 35 +4 –
M12 59 +6 –
M14 100 +10 –
M16 140 +14 –
M20 290 +29 –
M
A
= tightening torques
Tightening torque for stress bolt connections as per MTN 5007 standard
This standard applies to stress pin bolts and stress bolts which are subjected to static and dynamic load of
strength class 10.9 as well as to the associated nuts.
Shaft and transition dimensions as per MMN 209 standard and material and machining as per MMN 389
standard (bright surface or phosphatized).
The values in the table are based on a friction coefficient µtot = 0.125.
Threads and mating faces of screws and nuts must be coated with engine oil prior to assembly.
An assembly tolerance of +10% of the figures in the table is permitted due to unavoidable deviations during
the tightening process.
The values in the tables are for manual tightening using a torque wrench.
Thread
Not torsion-protected M
A
(Nm) Torsion-protected M
A
(Nm)
M6 9 12
M8 21 28
M8 x 1 24 30
M10 42 55
M10 x 1.25 46 60
M12 75 93
M12 x 1.5 78 99
M14 120 150
M14 x 1.5 135 160
M16 180 225
M16 x 1.5 200 245
M18 250 315
M18 x 1.5 300 360
M20 350 450
M20 x 1.5 430 495
M22 500 620
M22 x 1.5 560 675
M24 640 790
M24 x 2 700 850
M27 900 1170
M27 x 2 1000 1230
MS15034/00E 2018-08 | General Information | 41
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