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Metric Tightening Torques


Thread Diameter Friction Coefficient Tightening Torque M (Nm) Property Class
50 70 80
M1.6 0.1 0.1 0.1 0.2
0.2 0.1 0.2 0.35
M2 0.1 0.15 0.2 0.3
0.2 0.25 0.3 0.4
M2.5 0.1 0.25 0.45 0.6
0.2 0.45 0.6 0.65
M3 0.1 0.85 1 1.3
0.2 1 1.1 1.6
M4 0.1 0.8 1.7 2.3
0.2 1.3 2.6 3.5
M5 0.1 1.6 3.4 4.6
0.2 2.4 5.1 6.9
M6 0.1 2.8 5.9 8
0.2 4.1 8.8 11.8
M8 0.1 6.8 14.5 19.3
0.2 10.01 21.4 28.7
M10 0.1 13.7 30 39.4
0.2 20.3 44 58
M12 0.1 23.3 50 67
0.2 34.8 74 100
M14 0.1 37.1 79 106
0.2 56 119 159
M16 0.1 56 121 161
0.2 86 183 245
M18 0.1 81 174 232
0.2 122 260 346
M20 0.1 114 244 325
0.2 173 370 494
M22 0.1 154 182
0.2 234 279
M24 0.1 197 234
0.2 298 355
M27 0.1 275 328
0.2 421 502
M30 0.1 374 445
0.2 571 680
M33 0.1 506
0.2 779
M36 0.1 651
0.2 998
M39 0.1 842
0.2 1300

The friction vlaues can vary depending on many factors: material pairing, the surface quality (peak to valley heights), the surface treatment and the type of lubrication. Therefore this information is only meant as a guide

Note: Stainless steel fasteners tend to seize whilst being assembled (tightened). The risk of seizing is alleviated by:

Impact wrenches are not recommended for torquing 300 series stainless steel fasteners.

The tightening torques as stated above result in a 90% utilization of the yield strength.

Conversion Factor:

  • Nm to foot pound = 0.7376
  • Nm to inch pound = 8,851

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