... stainless steel flanges) 1.Materia:304,316,347,321,301,625,800 2.Standard: ASME, ANSI, API, JIS, JPI,MS Flanges(flange gasket ... ,stainless steel flanges)Threaded Flanges standard: ANSI/ASME B16.5, ANSI B16.47 ... ,AWWA C207... API, >Production size(NPS): 1/2 inch ...