The document contains dimensional and technical requirements of bolts and screws with external hexalobular driving feature with large flange and specifies their designation.
DIN 34801:1999 history
2021DIN 34801:2021 Bolts and screws with external hexalobular driving feature with large flange
1999DIN 34801:1999 Bolts and screws with external hexalobular driving feature with large flange