BS EN 14399-7. High-strength structural bolting assemblies for preloading. Part 7. System HR. Countersunk head bolt & nut assemblies Fasteners, Structures, Bolting, Bolts, Steels, High-tensile steels, Threaded fasteners, Countersunk fasteners, Nuts,
Dimensions, Strength of materials, Tensile strength, Mechanical properties of materials, Marking, Designations