... the specification of our Stud Bolts? 1.NameGR.A Zinc Plated Stud Bolts Supplier2.standardDIN,ASTM3.MaterialCarbon Steel ... 4.Grade4.8;SAE GR.A; SAE GR.25.FinishZinc plated(Cr,3+);zinc ... .NameRods,Studs,etc.2.StandardDIN975,DIN976,ASTM,JIS,BS,Nonstandard rod(according to your order),etc3.MaterialLow carbon ... .4.GradeDIN:4.8-12.9: SAE GR.A-GR.85.FinishPlain;black; zinc plated(Cr,3 ...