... -8.0mm(diameter) NameNoMaterialChemistry compontentsCSiMnPSCrNiMoVTiAlPinmaterial120CrMo0.17-0.240.17-0.370.40-0.70≤0.0350.08-1.10 0.15-0.25 235CrMo 0.32-0.400.17-0 ... 0.45≤0.0251.45-1.65 Our factory produce 30CrMnTi,20CrMnMo,20CrMo chain pin material for chain , the diameter is4.0mm-8 ... that I can give you the update quotation accordingly., 4.0-8.0 30CrMnTi,20CrMnMo,20CrMo chain pin material for chain