BS Standards BS EN 14399-3:2015 pdf download BS EN 14399-3:2015 pdf download.High-strength structural bolting assemblies for preloading - Part 3: System HR - Hexagon bolt and nut assemblies. BS EN 14399-3 specifIes, together with EN 14399-1 and EN 14399-2, the requirements for assemblies of... 08-13 Read More