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Flange bolt torque calculator

Tightening torque from bolt load or target stress (K-factor method).

Bolt size (metric)

Nut factor K

Work from

Target bolt stress (MPa)

Bolt load (kN)

How it's calculated. T = K × F × d. K ≈ 0.20 for dry steel, 0.16 lubricated, 0.10–0.12 with PTFE coating. Always follow the gasket maker's and your project's bolting procedure.

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