Metric Bolt Torque / Preload Calculator

Thread Size ISO M (coarse) Property Class (+) Torque Tolerance % (-) Torque Tolerance % Thread μ (min) Thread μ (max) Head μ (min) Head μ (max) Specified Torque N·m

Diameter mm Pitch mm Tensile Area mm² Proof Stress MPa Yield Stress MPa Tensile Stress MPa Proof Load N Yield Load N Tensile Load N Minimum Preload N Maximum Preload N Preload / Proof Load max Preload / Min Tensile max Nut Factor K