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Bolt Torque Calculator
Calculate bolt torque for flange bolting using the K-factor (nut factor) method. API 6A / ASME PCC-1.
Bolt Parameters
Results
Torque (ft-lb)
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Torque (N-m)
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Bolt Load (lb)
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Stress Area (in²)
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Bolt Stress (psi)
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% of Yield
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Formula: T = K x D x F
T = torque (in-lb), K = nut factor, D = nominal bolt diameter (in), F = bolt preload (lb)
F = target stress x stress area. Stress area (UNC) = pi/4 x (D - 0.9743/n)^2
Reference: ASME PCC-1, Appendix J. Always verify with project-specific requirements.
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