scope:

This document specifies, together with EN 14399-1, 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 to this document have been designed to allow preloading of at least 0,7 fub×As 1) according to 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 (see EN ISO 4032) . thread length of the bolt according to ISO 888 Bolt and nut assemblies to this document include washers according to EN 14399-6 or to EN 14399-5 (under the nut only). For recommendations concerning proper application, reference to ENV 1090-1 is made. The test method for suitability for preloading is specified in EN 14399-2.