Bolted Joint Preload and Torque Calculator

Calculate bolt preload, tightening torque, and bolt tension for threaded fastener joints. Accounts for friction coefficient, thread geometry, and under-head friction.

2D stress state at a point. All stresses in MPa.

σx — Normal Stress X (MPa)
σy — Normal Stress Y (MPa)
τxy — Shear Stress (MPa)
⚙ Mechanical Note: Results are based on standard textbook formulas and ISO/AASHTO references. Always verify critical designs with applicable codes (ISO 898, AASHTO 1993, AISC, Eurocode 3) and a qualified engineer.
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How to Use

Enter the values for the scenario you are assessing. Calculate bolt preload, tightening torque, and bolt tension for threaded fastener joints. Accounts for friction coefficient, thread geometry, and under-head friction. Use the bolt preload torque result to inform your calculation.

Frequently Asked Questions