Bolt torque calculator
Calculate required torque based on bolt specifications and preload coefficient
Input Parameters
Calculation Results
Please enter parameters and click the calculate button.
required torque
0 N·m
Formula: T = F x d x K / 1000
T=torque, F=preload, d=diameter, K=friction coefficient
Bolt pretightening force reference (kN)
| Specification | Level 8.8 | Level 10.9 | Level 12.9 |
|---|---|---|---|
| M6 | 8 | 12 | 14 |
| M8 | 14 | 21 | 25 |
| M10 | 23 | 33 | 39 |
| M12 | 33 | 47 | 56 |
| M16 | 62 | 88 | 104 |
Bolt specification table
| Specification | Thread pitch (mm) | Tensile strength (MPa) | Yield strength (MPa) |
|---|---|---|---|
| M6 | 1.0 | 400 | 240 |
| M8 | 1.25 | 400 | 240 |
| M10 | 1.5 | 400 | 240 |
| M12 | 1.75 | 400 | 240 |
| M16 | 2.0 | 400 | 240 |
| M20 | 2.5 | 400 | 240 |