1: Material: carbon steel 2: Size:M5X(6-80)-M39X(35-200) ; 3: Coating: black;zin; HDG and so on; 1.NameCarbon Steel Zinc plated Hexagon Bolt2.standardDIN931/933 DIN912, ASTM,JIS,BS,Nonstandard bolt(according to your order),etc3.MaterialCarbon Steel,low carbon steel; medium carbon steel(1035/1045);Alloy carbon steel,ect4.Class4.8;6.8;8.8;10.9;12.9;Gr2;GR5;GR8;5.FinishZinc plated();,Black,hot ...