Basic size
Strength class
Material
70 80
M
A
(Nm)
M
A
(Nm)
M20 254 326 A2 / A4
M
A
= tightening torques
Tightening torque for self-locking hex nuts
Thread
M
A
(Nm)
Lubricant
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 torques for stress bolt connections to 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.
Shank and junction dimensions to MMN 209 standard and material and manufacture to MMN 389
standard (bare metal 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 figures in the table are for hand-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
20 | General Information | M015655/05E 2015-06
TIM-ID: 0000002333 - 017
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