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High-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 flats, thread sizes M12 to M36 and property classes 8.8/8 and 10.9/10.

Bolt and nut assemblies conforming to this standard have been designed to allow preloading in accordance with ENV 1993-1-1 (Eurocode 3) and to obtain ductility predominantly by plastic elongation of the bolt. For this purpose the components have the following characteristics:

- nut height according to style 1;

- thread length of the bolt according to ISO 888.

History and related standards

This European Standard together with BS EN 14399-1:2005, BS EN 14399-2:2005,

BS EN 14399-4:2005, BS EN 14399-5:2005 and BS EN 14399-6:2005, supersedes BS 4395-1:1969 and BS 4395-2:1969, which will be declared obsolescent in September 2007, and then, together with BS 449 and BS 5950, will be withdrawn upon publication of Eurocode 3. (BS 4395-1:1969 and BS 4395-2:1969 currently support BS 449 and BS 5950.)

This standard includes the following cross-references:

EN 493, EN 10045-1, EN 14399-1, EN 14399-2, EN 14399-5, EN 14399-6,

EN 20898-2, EN 26157-1, EN ISO 898-1, EN ISO 3269, EN ISO 4759-1,

EN ISO 10684, ISO 148, ISO 261, ISO 965-2 and ISO 965-5.

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