7 [EN] EN 14399-10 (HRD) - 2018 High-Strength Structural Bolting Assemblies for Preloading - System HRC - Nuts with m=1d (HRD) 8 [DIN] DIN 6915 - 1989 High-strength hexagon nuts with large widths across flats for structural steel bolting 9 [ASME] ASME B 18.2.2 - 2022 Heavy Hex...