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Bolt Torque Calculator

Find the tightening torque and clamp load for metric bolts by size, property class and lubrication condition.

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SizeStress AreaClamp LoadTorque
Tightening Torque

⚠️ Torque values come from the standard T = K·F·d estimate, which is sensitive to real friction — actual scatter of ±25% is normal even with controlled conditions. Always follow the manufacturer's specified torque where one exists, especially for critical joints, and never reuse stretched or damaged fasteners.