Technical resources
The BoltCore blog.
Bolt calculation, preload, safety margins, ECSS methodology — technical articles for engineers who justify critical bolted joints.
Published
Pillar article
Bolt Calculation per ECSS-E-ST-32-19C: The Complete Guide
Preload, safety margins, geometric parameters, and justification methodology — the reference guide for sizing a critical bolted joint.
Read the article → TechnicalBolt Preload: How to Calculate It and Why It's Critical
The Fv,min/Fv,max bracket, in-service losses, and how tightening method accuracy directly impacts your safety margins.
Read the article →Coming up — Month 2: technical deep-dives
01d0, d3, duh diameters for M8 bolts: where to find them and how to use them
03Friction coefficient in bolted joints: typical values and uncertainties
04Thermal expansion coefficients (CTE): impact on cryogenic tightening
Coming up — Month 3: use cases & comparisons
05Choosing your bolt strength class (8.8, 10.9, 12.9, A2-70, A4-80)
06Fatigue safety margin for bolted joints: method and common pitfalls
07The most common mistakes in bolted joint justification files
08Self-loosening: causes, detection, prevention
09ECSS vs NASA-STD vs Eurocode: comparing bolt calculation standards
10Checklist: data to gather before a bolt justification calculation
11Why automate your ECSS bolt calculations
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