SO Flange RF,12",300#,ASTM A105/ANSI B16.5 1.Standard:ANSI, DIN,JIS, BS 2.carbon/stainless/alloy/ ... steel Description of Flange:Production NameSO Flange RF,12",300#,ASTM A105/ANSI B16.5,UNIT WEIGHT:51KG Size1/4''-48'',DN8 ... Factory in-house or Third Party inpection SO Flange RF,12",300#,ASTM A105/ANSI B16.5,UNIT WEIGHT:51KG