Din 835 bolt studs class 12.9 M8x40mm (x 200) M6x70mm (x 200) black oxide coating (or other coating, galvanized, zinc etc) Or DIN 976 (chamfer ends) studs class 12.9 M8x40mm (200) M6x70mm (200) black oxide coating (or other coating,or other coating, galvanized, zinc etc)