Tools calculators

• Bolt Pre-selection — Preliminary bolt sizing based on the Kübler equation
• Bolt Joint — Preselection & Verification — Kübler-equation preselection plus a simplified VDI 2230-1 verification
• VDI 2230 Bolt Joint Calculation — VDI 2230 Part 1:2015 — Systematic single bolt joint calculation (V1: Concentrically loaded)
• Stress Categorization & Linearization — Through-wall stress linearization (membrane + bending) + polynomial coefficients — BS 7910 §6.4 & API 579
• Master Curve Reference Temperature T₀ — ASTM E1921 — Reference Temperature of Ferritic Steels in the Transition Range

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