Preloaded bolted assemblies are very sensitive to differences in manufacture and lubrication. Therefore, it is important that the bolting assemblies are supplied by one manufacturer who is always responsible for the functionality of the bolting assemblies.
BS EN 14399-3 specifies, together with EN 14399-1 and EN 14399-2, 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 or 8.8/10 and 10.9/10.
General requirements and requirements for suitability for preloading are specified in EN 14399-2. BS EN 14399-4 specifies clamp lengths and grip lengths for the bolting assemblies.
BS EN 14399-3 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 consist of two different systems (HR and HV) of bolt/nut/washer assemblies. 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.
BS EN 14399-3 on structural bolting guidance is useful for:
With the mechanical properties of the components, also the functionality of the bolting assemblies requires that the specified preload can be achieved if the bolting assemblies are tightened with a suitable procedure.
BS EN 14399-3 provides with you the specifications and dimensions requirements for bolts and reference standards. Following the guidelines given in BS EN 14399-3 helps you to design effective bolt and nut assemblies.
The performance of the high-strength structural bolting assemblies depends on the properties of their specific components. BS EN 14399-3 provides you with functional characteristics of the bolt/nut/washer(s) assembly.
Following the guidelines provided in BS EN 14399-3 creates a standardized approach for you and you can deliver high-quality bolting assemblies and related components to your customers. These customers will be able to safely use bolts/nuts/washer assemblies.
BS EN 14399-3:2015 supersedes BS EN 14399-3:2005, which is withdrawn. BS EN 14399-3:2015 includes some technical changes with respect to BS EN 14399-3:2005. These include:
EN 14399-3:2015