MTU 12V4000M73 series Operating Instructions Manual page 24

Tightening torque for self-locking hex nuts
M6
M8
M10
M12
M14
M16
M20
M = tightening torques
A
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.
M6
M8
M8 x 1
M10
M10 x 1.25
M12
M12 x 1.5
M14
M14 x 1.5
M16
M16 x 1.5
M18
M18 x 1.5
M20
M20 x 1.5
M22
M22 x 1.5
M24
M24 x 2
M27
M27 x 2
22 | General Information | MS150045/03E 2018-08
Thread
Not torsion-protected M
Thread
M (Nm)
A
7.5 +1
17 +2
35 +4
59 +6
100 +10
140 +14
290 +29
(Nm)
A
9
21
24
42
46
75
78
120
135
180
200
250
300
350
430
500
560
640
700
900
1000
Lubricants
–
–
–
–
–
–
–
Torsion-protected M (Nm)
A
12
28
30
55
60
93
99
150
160
225
245
315
360
450
495
620
675
790
850
1170
1230