stud bolt astm a193 b7 1.Grade:AASTM A193 B7 2. ... :plain,zinc plated,HDG... stud bolt astm a193 b71) Material: High quality carbon steel Class :4.8, 5.8, 6. ... .2, A307 2) Material :Alloy steel :20MnTiB ,40Cr ,42CrMo Class :8.8, 10.9,12.9 ,GR.2,GR.5 ... steel :302 ,304 ,305 ,316, 304L ,316L ,410, 430 Class: A2-50 ,A4-50 , A2-70 ,A4-70 ,GR.B8 ... plastic box. 3)As to customers' requirement stud bolt astm a193 b7