Estimate tightening torque from clamp force, bolt diameter, and a nut factor K.
| Torque (N·m) | – |
Use this calculator for T = K × F × d. Enter the clamp force in kN, the nominal diameter, and K (often 0.2 for as-received steel).
Torque (N·m) = K × (force in N) × (diameter in m). Diameter can be entered in millimetres (mm) or inches (in). Force stays in kN; K is dimensionless.
This is a nut-factor estimate. It is not a tensioned-bolt stretch or a lubricant-specific table.
Force (kN): Target clamp force in kilonewtons.
Diameter: Nominal bolt diameter, in mm or in.
K: Nut factor. Dry steel is often around 0.2; lubricated is lower.
Torque (N·m): Estimated tightening torque.
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