Tightening torques for mounting screws (ISO 4014, ISO 4017, ISO 4762)
for µ = 0,12 in Nm
| M2 | M2,5 | M3 | M4 | M5 | M6 | M8 | M10 | M12 | M14 | M16 | M20 | M24 | M30 | |
| Strength class 8.8 | 0,35 | 0,73 | 1,28 | 2,9 | 5,75 | 9,9 | 24 | 48 | 83 | 132 | 200 | 390 | 675 | 1350 |
| Strength class 10.9 | 0,5 | 1,02 | 1,8 | 4,1 | 8,1 | 14 | 34 | 67 | 117 | 185 | 285 | 550 | 950 | 1900 |
| Strength class 12.9 | 0,6 | 1,23 | 2,15 | 4,95 | 9,7 | 16,5 | 40 | 81 | 140 | 220 | 340 | 660 | 1140 | 2280 |
Important note: These values apply to galvanized steel screws in a steel thread.
Wittel, H., Muhs, D., Jannasch, D., Voßiek, J. (2009). Roloff/Matek Maschinenelemente Tabellenbuch S. 105, 19. Auflage, Wiesbaden.
Torque and preload with friction scatter | Bossard North America