MTU Detroit Diesel 183 Series Technical Publication page 29

General
Tightening torques in Nm for non-yielding screws with normal nuts and locknuts.
(Extract from MBN 10 130 "Tightening torques for screws and nuts with metric threads").
The table values apply to screws and nuts with head dimensions corresponding to MBN 10 105 and
MBN 10 143 (without consideration of the torque scatter of the various tightening procedures).The tightening
torques are for a friction coefficient range of:
Hexagonal screw with flange
Standard thread
Strength class
M5 x 0.8
M6 x 1
M7 x 1
M8 x 1.25
M10 x 1.5
M12 x 1.75
M14 x 2
M16 x 2
M18 x 2.5
M20 x 2.5
20080/1 E 98-12
= 0.08 - 0.14
8.8 10.9 Strength class
5 8 --
9 13 --
15 22 --
22 32 M8 x 1
42 62 M10 x 1
74 108 M12 x 1.5
120 175 M14 x 1.5
180 265 M16 x 1.5
260 370 M18 x 1.5
365 515 M20 x 1.5
Hexagonal round screw with flange
Fine thread
Group 00
Subgroup 0003
Page 15
8.8 10.9
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23 33
45 67
76 111
125 185
190 280
280 400
390 555