The values reported in this document are calculated considering
90% of Rp0,2 (0,2% elongation)
μtot= 0,12 (Average value of total friction coefficient in conventional assembly)
The minimum value to set on the torque wrench is
(for modern screwer)
The reference of the steel classes are
- 4.8 Rp0,2=320 N/mm2
- 8.8 Rp0,2=0 N/mm2
- 10.9 Rp0,2=940 N/mm2
- 90 Rm=900÷1000 N/mm2
| BOLTS AND NUTS | ||
| Type of bolt/nut | Tightening torque MAmax. Nm | |
| Steel class 4.8 | Steel class 8.8 | |
| M3 | 0,5 | 1,2 |
| M4 | 1,1 | 2,7 |
| M5 | 2 | 5 |
| M6 | 3,7 | 9 |
| M8 | 9 | 22 |
| M10 | 18 | 45 |
| M12 | 30 | 75 |
| M16 | 75 | 185 |
| M18 | 104 | 260 |
| M20 | 148 | 370 |
| HEXAGON HEAD SCREWS | ||
| Type of screw | Tightening torque MAmax. Nm | |
| Steel class 4.8 | Steel class 8.8 | |
| M3 | 0,60 | 1,27 |
| M4 | 1,37 | 3 |
| M5 | 2,7 | 5,9 |
| M6 | 4,7 | 10,1 |
| M8 | 11,3 | 24,6 |
| M10 | 22,9 | 48 |
| M12 | 39 | 84 |
| M14 | 62 | 133 |
| M16 | 96 | 206 |
| M18 | 133 | 295 |
| M20 | 187 | 415 |
| HEXAGONAL SOCKET HEAD CAP SCREWS | |
| Type of screw | Tightening torque MAmax. Nm |
| Steel class 8.8 | |
| M3 | 1 |
| M4 | 2 |
| M5 | 4 |
| M6 | 8 |
| M8 | 12 |
| M10 | 35 |
| M12 | 50 |
| M16 | 110 |
| M20 | 200 |
| HEXAGONAL SOCKET BUTTON HEAD SCREWS | ||
| Type of screw | Tightening torque MAmax. Nm | |
| Steel class 8,8 | Steel class 10.9 | |
| M3 | 1 | 1 |
| M4 | 2 | 2 |
| M5 | 4 | 4 |
| M6 | 8 | 8 |
| M8 | 12 | 12 |
| M10 | 30 | |
| M12 | 60 | |
| HEXAGON BOLTS WITH FLANGE | |
| Type of screw | Tightening torque MAmax. Nm |
| Steel class 90 | |
| M5 | 9 |
| M6 | 16 |
| M8 | 34 |
| M10 | 58 |
| M12 | 97 |
| M14 | 155 |
| M16 | 215 |
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