... companies choosing the material quality, production, advanced technology, reliable quality, low price Steel bolts demand side ... on.sizesAccording to clientsClassAccording to clientsShape of headSquare, or according to custmoers' requirementsSurface treatmentBlack, Hot-dip ... 200mmTensile strengthMax:1240Mpa, Min:1040Mpa.Yield strengthMin:940MpaGrade8.8 or 10.9StandardDIN, ANSI, ASME, ASTM, IFI, JIS, ...