Bolt Torque Calculator
Quick answer
Bolt torque sets clamp load through diameter, strength grade, and assumed friction coefficients.
Lubrication and thread condition change real friction, so field values may differ from tables.
Use the calculator below for planning torque, then verify critical joints with manufacturer data.
Calculate safe tightening torque for metric and imperial bolts. Cross-check diameters using M8 bolt size data.
See bolt size chart references for adjacent shank sizes.
Torque calculator
Why torque matters
Correct torque helps prevent loose joints, bolt stretch, and thread damage. Always use a calibrated torque wrench and follow equipment-specific service guidance where available.
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