... tensile two head threaded stud bolts1) Material: High quality carbon steel Class :4.8, 5.8, 6.8, GR.2, A307 ... ,A325-1,A490-1 ,GR.B7,GR.B7M3) Material :stainless steel :302 ,304 ,305 ,316, 304L ,316L ,410, 430 Class: ... ,A4-70 ,GR.B8,GR.B8MSurface Refine : Part galvanization ,Colorful galvanization ,Army green galvanization ,Black galvanization ,Steam Black ,Ash phosphorus ,Brass , Nickel plate ,Chrome ...