Bolt Torque Calculator
Find the torque needed to achieve a target bolt preload.
CALCULATE
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Formulas
T = K × F × dK = nut factor (0.2 dry steel, 0.15 lubricated), F = preload, d = bolt diameter
Bolt Torque
K factors: Dry steel: 0.20. Lubricated: 0.15. Cadmium plated: 0.14. Anti-seize: 0.12. Only 10-15% of applied torque becomes actual clamping force; the rest is lost to friction.
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