Thread
Hand-tightening
Machine-tightening
8.8 M
A
(Nm)
10.9 M
A
(Nm)
8.8 M
A
(Nm)
10.9 M
A
(Nm)
M22
480
680
450
650
M22 x 1.5
520
730
490
700
M24
600
850
570
810
M24 x 1.5
680
950
640
900
M24 x 2
660
900
620
850
M27
900
1250
850
1175
M27 x 2
960
1350
900
1275
M30
1200
1700
1100
1600
M30 x 2
1350
1900
1250
1800
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
M20 x 1.5
430
495
M22
500
620
M22 x 1.5
560
675
M24
640
790
M24 x 2
700
850
16 | General Information | M015590/06E 2014-03
TIM-ID: 0000002333 - 015
