DIN 6914
High-strength hexagon head bolts
DIN 6915
High-strength hexagon head nuts
DIN 6916
Round washers for high-strength structural steel bolting
DIN EN 14399-4
High-strength structural bolting assemblies for preloading –
Part 4: System HV –
Hexagon bolt and nut assemblies;
English version EN 14399-4:2015,
English translation of DIN EN 14399-4:2015-04