Bolt load and clamp force
Simplified model: residual clamp force F_KR and maximum bolt force F_S,max. Not a complete VDI 2230 verification.
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Bolt load and clamp force — simplified model
Estimates residual clamp force and maximum bolt force based on VDI concepts for a concentric, static, axially loaded bolted joint: does the joint stay clamped (F_KR), does the bolt stay below yield (F_Smax)? This is not a complete VDI 2230 verification.
Bolt and preload
Result
- F_V,rest (after embedding)
- 19 kN
- F_KR (residual clamp load)
- 15,25 kN
- F_S,max (max. bolt force)
- 20,25 kN
- σ_S (bolt stress)
- 349,1 N/mm²
- Static safety against yield S_F
- 1,83
F_KR ≥ F_Kerf with adequate margin — joint stays clamped.
S_F ≥ 1.2 — adequate margin against yielding.
Use the fasteners tool for tightening torque and A_s/Rp0.2 →
DESIGN ESTIMATE — VERIFY
Before use: For a critical or eccentrically/dynamically loaded joint: use a full VDI 2230 calculation (embedding table, tightening torsion, fatigue check).
Validity: Concentric, static axial load only — no eccentric/bending load, no transverse load, no fatigue
Assumptions: Only the two classic VDI 2230 boundary cases: residual clamp load under full working load and maximum bolt force under full working load. The load factor Φ, embedding loss F_Z and the required residual clamp load are your own input (from a table or measurement) — this is not a full joint dimensioning. The caution thresholds (10% margin on F_Kerf, S_F between 1.0-1.2) are Mechify screening criteria, not literal VDI 2230 table values — VDI 2230 itself does not mandate one fixed safety factor.
Source details
Simplified concentric bolt-load / clamp-force model based on VDI 2230 concepts
Checked 2026-09-17