... Length: 10mm-200mm Hexagon head bolt: Treatment: HDG, Zinc, Black... Carbon steel: Grade/class 4.8, 5.8, 8.8, ... Gr5,Gr8, A307Surface: SELF COLOUR, BLACK,ZP,YZP,H.D.G, DACROMENTMaterials:high quality carbon steel (C1015,C1035,C1045etc)Alloy ... Torshear type high strength bolts for steel structureMaterialAlloy steel ,carbon steel, stainless steel etc.SizeM16-M30Length40mm-200mmTensile strengthMax:1240Mpa ...