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EN14399 Hex Head Bolt

Updated:2022-11-18 Attention:43


This standard on structural bolting reflects the situation in Europe where two technical solutions exist to achieve the necessary ductility of bolt/nut/washer assemblies.

High-strength structural bolting assemblies for preloading

This standard on structural bolting reflects the situation in Europe where two technical solutions exist to achieve the necessary ductility of bolt/nut/washer assemblies. These solutions utilize different systems(HR and HV) of bolt/nut/washer assemblies. It is importance for the performance of the assembly to avoid mixing up the components of both systems. Therefore the bolts and nuts for both systems are standardized in one single part of this European Standard each and the marking of the components of the same system is uniform.

Bolt fasteners is qualified to manufacture pre-load bolt assemblies as high strength structural bolt according to BS EN 14399-1:2015, this High-strength structural bolting assemblies for preloading is classified in these ICS categories: High-strength structural bolting assemblies in accordance with EN 14399-2 to EN 14399-10 are designed to fulfil the requirements of this European Standard. High-strength structural bolting assemblies are suitable for preloading in accordance with EN 1090-2 in steel structures.

According to this standard, high-strength structural bolting assemblies smaller than M12 are not designed to be preloaded. Longteng supplies structural hex head bolt in following sizes: M30, M33, M36, M39, M42, M45, M48, M52, M56, M60, M64, this type of hex head bolt is not suitable for railway fastener and weld treatment.


This document on structural bolting reflects the situation in Europe where two technical solutions exist to achieve the necessary ductility of bolt/nut/washer(s) assemblies. These solutions consist of two different systems (HR and HV) of bolt/nut/washer assemblies (see Table 1). Both systems are well proven and it is the responsibility of the experts using structural bolting whether they use the one or the other system.It is, however, important for the performance of the assembly to avoid mixing up the components of both systems. Therefore, bolts and nuts for both systems are standardized in one single part of this European Standard each and the marking of the components of the same system is uniform.