DIN EN 14399-7:2008-03

This part of this European standard specifes, together with prEN 14399-1, the requirements for assemblies of high-strength structural countersunk bolts and nuts of system HR suitable for preloaded joints with, thread sizes M12 to M36 and property classes 8.8/8 and 10.9/10. Countersunk bolt and nut assemblies to this part of this European Standard have been designed to allow preloading of at least 0.7 fub x As according to ENV 1993-1-1 (Eurocode 3) and to obtain ductility predominantly by elongation of the bolt. For this purpose the components have the following characteristics: - nut height according to style 1 (see ISO 4032) - thread length of the bolt according to ISO 888 Countersunk bolt and nut assemblies to this part of this European standard include washers according to prEN 14399-5 (under the nut only) or to prEN 14399-6.