Bolt Torque and Preload Calculator
Calculate preload force based on known tightening torque, suitable for bolt connection design and verification.
Unit: mm
mm
mm
Nm
Nm
Calculation Results
Minimum Tightening Torque Tmin
- Nm
Maximum Tightening Torque Tmax
- Nm
Maximum Preload Force in Given Torque Range
- KN
Minimum Preload Force in Given Torque Range
- KN
Maximum Preload / Minimum Preload Ratio
-
Important Notes
Calculation Principle
This calculator is based on the theoretical relationship between bolt tightening torque and preload force. By inputting the torque range and friction coefficients, it calculates the preload force range under given conditions.
Precautions
- Results are for reference only; consider specific working conditions in actual applications
- Friction coefficients are significantly affected by surface treatment and lubrication
- Experimental verification is recommended for critical connections
- Bolt material and strength grade also affect final connection performance