MRS/MMSE/ARS/TPM
Appendix
Revision: 11
5022-D002420
en-39
10.2
Tightening torques for common thread sizes in general mechanical engineering
The specified tightening torques for headless screws and nuts are calculated values and are based
on the following conditions:
- Calculation in accordance with VDI 2230 (February 2003 version)
- Friction value for thread and contact surfaces µ=0.10
- Exploitation of the yield stress 90%
- Torque tools type II classes A and D in accordance with ISO 6789
The settings are values rounded to usual commercial scale gradations or setting possibilities.
Set these values
precisely
on the scale.
10.3
Tightening torques for common thread sizes with corrosion-resistant screw connections
The specified tightening torques for screws and nuts are calculated values and are based on the
following conditions:
- Calculation based on VDI 2230 (February 2003 issue)
- Friction value for thread and contact surfaces µ=0.10
- Exploitation of the yield stress 90%
- Only valid for:
- Screws according to ISO 4762, ISO 4014, ISO 4017
- Nuts according to ISO 4032, ISO 4033
The settings are values rounded to usual commercial scale gradations or setting possibilities.
Set these values
precisely
on the scale.
Tightening torque [Nm] with thread
Property
class
Screw / Nut
M2
M3
M4
M5
M6
M8 M10 M12 M14 M16 M18 M20 M22
8.8 / 8
0.323 1.15 2.64 5.2
9.0 21.5 42.5 73.5 118 180 258 362 495
10.9 / 10
0.474 1.68 3.88 7.6 13.2 32.0 62.5 108 173 264 368 520 700
12.9 / 12
0.555 1.97 4.55 9.0 15.4 37.5 73.5 126 202 310 430 605 820
Tbl-19: Tightening torques for headless screws and nuts
Tightening torque [Nm] with thread
Property
class
screw / nut
M3
M4
M5
M6
M8 M10 M12 M14 M16 M18 M20 M22 M24
Ax-50
0.376 0.868 1.72 2.95 7.2 14.0 24.0 38.5 59.0 82.0 115 157 199
Ax-70
0.806
1.86 3.68 6.4 15.2 30.0 51.5 83.0 127 176 248 336 425
Ax-80
1.07
2.48 4.91 8.4 20.5 40.0 69.0 111 169 234 330 450 570
Tbl-20: Tightening torques for screws and nuts made from austenitic steel
