... and nut Model: As per machine Material: 40Cr Processing: Forging Size: M12*40 19/40-1.11/20 ... so on.sizesAccording to clientsClassAccording to clientsShape of headSquare, or according to custmoers' requirementsSurface treatmentBlack, Hot-dip galvanization, ... M30Length40mm-200mmTensile strengthMax:1240Mpa, Min:1040Mpa.Yield strengthMin:940MpaGrade8.8 or 10.9StandardDIN, ANSI, ASME, ASTM, IFI, JIS, ...