High-strength structural bolting assemblies for preloading - System HR. Countersunk head bolt and nut assemblies Ingestion-build-65808 This first amendment to Part

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High-strength structural bolting assemblies for preloading - System HR. Countersunk head bolt and nut assemblies Ingestion-build-65808 This first amendment to Part1 Scope This European Standard specifies, together with EN 143991 and EN 143992, the requirements for assemblies of high strength structural countersunk bolts and nuts of system HR suitable for preloaded joints with thread sizes M12 to M36 and property classes 8. 8 8 or 8. 8 10 and 10. 9 10. Bolting assemblies in accordance with this document have been designed to allow preloading of at least 0,7 fub As1) according to EN 199318 (Eurocode 3) and to