High-strength structural bolting for preloading - System HR. Hexagon bolt and nut assemblies Ingestion-build-251241 BS 5306-7:1988 specifies requirements and

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High-strength structural bolting for preloading - System HR. Hexagon bolt and nut assemblies Ingestion-build-251241 BS 5306-7:1988 specifies requirements andHigh strength structural bolting assemblies for preloading Part 3: System HR Hexagon bolt and nut assemblies Executive summary Requirements for assemblies of high strength structural bolts and nuts of system HR suitable for preloaded joints. Abstract This European Standard, together with EN 14399 1, specifies the requirements for assemblies of high strength structural bolts and nuts of system HR suitable for preloaded joints with large widths across