IS 3757 is the Indian standard for high strength structural bolts, used as HSFG (high strength friction grip) bolts in steel buildings, bridges, towers and industrial structures. The bolts come in two structural property classes, 8.8S and 10.9S, typically in sizes…
HR vs HV Bolts: EN 14399-3 vs EN 14399-4 Explained
HR bolts (EN 14399-3) and HV bolts (EN 14399-4) are the two hexagon-head preloaded bolt systems in the EN 14399 series. Both are designed for the same minimum preload, 0.7 × fub × As, and both are tightened using the methods…