Bolt Tightening Torque Calculator

Estimate the required tightening torque for a threaded fastener to achieve a desired preload (clamp load) using the T = K * D * F formula.

Parameters

Nominal Diameter (D) mm

Desired Clamp Load (F) Newtons

Nut Factor / Friction Coeff. (K)

Estimated Torque Result

Target Tightening Torque

60.0 N·m

⚠️ Engineering Disclaimer

This is a theoretical estimation. Actual required torque can vary by ±25% depending on thread condition, actual friction variations, tool calibration, and operator technique. Critical joints should be physically tested using a torque tension analyzer (Skidmore-Wilhelm).