| 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 values 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.
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