MTU Detroit Diesel 183 Series Technical Publication page 31

General
Tightening torques for set screw- and stud connections according to MTN 5008.
#This works standard applies to set screws subjected to little dynamic load as per MMN 384, DIN 912, EN 24014
(DIN 931-1), EN 24017 (DIN 933), EN 28765 (DIN 960), EN 28676 (DIN 961), DIN 6912 and to studs as per DIN
833, DIN 835, DIN 836, DIN 938, DIN 939 and associated nuts.
It does not apply to heat-proof screws in the hot component area.
Tightening torques M are for of strength class 8.8 (bright surface, phosphate coating or galvanised) and 10.9
A
(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.
When tightening mechanically, the permitted assembly tolerance is + 15 %.
Tightening torques = M
A.
Thread
M6
M8
M8 x 1
M10
M10 x 1.25
M12
M12 x 1.25
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 1.5
M24 x 2
M27
M27 x 2
M30
M30 x 2
20080/1 E 98-12
Manually tightened
8.8 10.9
M (Nm) M (Nm)
A A
9
21
23
42
45
74 100
80 110
76 105
115 160
125 180
180 250
190 270
250 350
280 400
350 500
390 550
480 680
520 730
600 850
680 950
660 900
900 1250
960 1350
1200 1700
1350 1900
Machine tightened
8.8
M (Nm)
A
12 8
31 20
32 21
60 40
63 42
70
75
72
110
120
170
180
240
270
330
350
450
490
570
640
620
850
900
1100
1250
Group 00
Subgroup 0003
Page 17
10.9
M (Nm)
A
11
28
30
57
60
92
105
100
150
170
235
255
330
380
475
520
650
700
810
900
850
1175
1275
1600
1800