MTU Detroit Diesel 183 Series Technical Publication page 32

Group 00
Subgroup 0003
Page 18
Tightening torques for stress bolt connections according to MTN 5007.
This work standard applies to stress pin bolts and stress bolts of strength class 10.9 which are subjected to static
and dynamic load, and their associated nuts.
Shaft and transition dimensions as to MMN 209 standard and material and machining to MMN 389 (bright surface
or phosphate coating).
The values in the table are based on a friction coefficient tot = 0.125. Precondition: Threads and mating faces of
screws and nuts must be coated with engine oil prior to assembly.
When tightening manually (tightening specifications), an assembly tolerance of +10% of the table values is
permitted for unavoidable deviations of the tightening torque from the table value during the tightening process - e.g.
resulting from inaccurate readings and overtightening during assembly.
The values in the tables are for manual tightening with torque wrench.
Tightening torques = M
A.
Thread
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
M30
*Protect shank against torsion when tightening.
20080/1 E 98-12
Without torsion protection
M (Nm)
A
9
21
24
42
46
75
78
120
135
180
200
250
300
350
430
500
560
640
700
900
1000
1250
With torsion protection*
M (Nm)
A
12
28
30
55
60
93
99
150
160
225
245
315
360
450
495
620
675
790
850
1170
1230
1575
General