2 General Information
2.1 Tightening specifications for screws, nuts and bolts
Tightening torques for setscrew and stud joints to MTN 5008 standard
This standard applies to setscrews not subject to dynamic loads and the associated nuts according to:
• MMN 384
• ISO 4762 (DIN 912)
• ISO 4014 (DIN 931-1)
• ISO 4017 (DIN 933)
• DIN EN ISO 8765 (EN 28765; DIN 960)
• DIN EN ISO 8676 (EN 28676; DIN 961)
• DIN 6912
This standard applies to studs not subject to dynamic loads and the associated nuts according to:
• DIN 833
• DIN 835
• DIN EN ISO 5395 (DIN 836)
• DIN 938
• DIN 939
This standard applies to screws with hexalobular heads according to:
• DIN 34800
• DIN 34801
The standard does not apply to heat-resistant screws in the hot component zone.
Tightening torques M
A
are specified for screws of strength class 8.8 (surface finish bare metal, phosph-
atized or galvanized) and 10.9 (surface finish 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.
When hand-tightening (defined torque), an assembly tolerance of +10% of the figures in the table is per-
mitted.
When machine-tightening, the permissible assembly tolerance is ±15%.
Tightening torques for setscrews
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)
M6 9 12 8 11
M8 21 31 20 28
M8 x 1 23 32 21 30
M10 42 60 40 57
M10 x 1.25 45 63 42 60
M12 74 100 70 92
M12 x 1.25 80 110 75 105
M12 x 1.5 76 105 72 100
M14 115 160 110 150
M14 x 1.5 125 180 120 170
M16 180 250 170 235
M16 x 1.5 190 270 180 255
18 | General Information | M015655/05E 2015-06
TIM-ID: 0000002333 - 017
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