Bolt Joint — Preselection & Verification

Kübler-equation preselection plus a simplified VDI 2230-1 verification

Calculation Method

• Preselection — uses the Kübler equation for quick sizing (±15–20%).
• Verification — a simplified central-load check (±5–10%) covering preload, tightening torque, static safety and fatigue.

For eccentric load or bending, use the full VDI 2230-1 method.

Data Basis

• DIN 13-1 (ISO 261) — metric ISO thread geometry
• DIN EN ISO 898-1 — bolt mechanical properties
• VDI 2230-1 — systematic bolt joint calculation

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