Cylindrical Pins with Internal Thread
Prodotti
Normative
-
ISO 8735
Self-Tapping Screws – Steel C15
| Thread nominal diameter (mm) | Tightening torque Nm |
| 2,2 | 0,450 |
| 2,9 | 1,500 |
| 3,5 | 2,800 |
| 3,9 | 3,400 |
| 4,2 | 4,500 |
| 4,8 | 6,500 |
| 5,5 | 10,000 |
| 6,3 | 14,000 |
| 8 | 31,000 |
Set Screws – Steel 45H
| Thread nominal diameter (mm) | Tightening torque Nm |
| M3 | 0,9 |
| M4 | 2,5 |
| M5 | 5 |
| M6 | 8,5 |
| M8 | 20 |
| M10 | 40 |
| M12 | 65 |
| M16 | 160 |
| M20 | 310 |
| M24 | 520 |
Metric Screws – Steel Grade 8.8, Coarse Thread
| Thread nominal diameter (mm) | Preload N | Tightening torque Nm |
| M3 | 2550 | 1,5 |
| M4 | 3930 | 3,1 |
| M5 | 6360 | 6 |
| M6 | 9000 | 10,4 |
| M8 | 16400 | 24,6 |
| M10 | 26000 | 50,1 |
| M12 | 37800 | 84,8 |
| M14 | 51500 | 135 |
| M16 | 70300 | 205 |
| M18 | 86000 | 283 |
| M20 | 110000 | 400 |
| M22 | 136000 | 532 |
| M24 | 158000 | 691 |
| M27 | 206000 | 1010 |
| M30 | 251000 | 1370 |
Coefficient to be applied to the steel grade values 8.8
| ACC, 4,8 | ACC. 10,9 | ACC, 12,9 |
| 0,500 | 1,406 | 1,688 |
Hex Nuts
| Nominal diameter | Class 8 tightening torque (Nm) | Class 10 tightening torque (Nm) |
| M3 | 4 | 5,2 |
| M4 | 7 | 9,15 |
| M5 | 12,14 | 14,8 |
| M6 | 17,2 | 20,9 |
| M8 | 31,8 | 38,1 |
| M10 | 50,5 | 60,3 |
| M12 | 74,2 | 88,5 |
| M14 | 101,2 | 120,8 |
| M16 | 138,2 | 164,9 |
| M18 | 176,6 | 203,5 |
| M20 | 225,4 | 259,7 |
| M22 | 278,8 | 321,2 |
| M24 | 324,8 | 374,2 |
| M27 | 422,3 | 486,5 |
| M30 | 516,1 | 594,7 |
Practical Method for Adjusting Screwdrivers
Adjust the screwdriver to progressively increasing torque values until the screw breaks. Repeat the test on a certain number of pieces (sample batch) and determine the minimum torque value that causes breakage. Then adjust the screwdriver to a torque equal to 50-60% of this value.