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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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Disclaimer: For reference only. Always follow project specifications and qualified engineer review for critical bolted joints.