stud bolt astm a193 b7 1.Grade:AASTM A193 B7 2.Size:M6--M64 1/4-2'' 3.Length:16-300mm 4.Finish:plain,zinc plated,HDG... stud bolt astm a193 b71) Material: High quality carbon steel Class :4.8, 5.8, 6.8, GR.2, A307 2) Material :Alloy steel :20MnTiB ,40Cr ,42CrMo Class :8.8, 10.9,12.9 ,GR.2,GR.5,GR.8,A325-1,A490-1 ,GR.B7,GR.B7M3) Material :stainless steel :302 ,304 ,305 ,316, 304L ,316L ,410, 430 ...