scope:

This document specifies together with EN 14399-1 the requirements for assemblies of high-strength structural bolts and nuts of system HV suitable for preloaded joints with large widths across flats, thread sizes M 12 to M 36 and property classes 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 deformation of the engaged threads. For this purpose the components have the following characteristics: . nut height approximately 0,8 d . bolt with short thread length Bolt and nut assemblies according 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. Clamp lengths for the bolt/nut/washer assemblies are given in the normative Annex A.