... 1.Standard:GB1499-98, BS4449,ASTM A615 ,KS 2.Grade:HRB335, HRB400. HRB400E,HRB500, GR460,GR40,GR60 KS-SD400 Threaded Steel ... 1.Standard:GB1499-98, BS4449,ASTM A615 ,KS 2.Grade:HRB335, HRB400. HRB400E,HRB500, GR460,GR40,GR60 KS-SD400 3.Diameter ...