SO Flange RF,12",300#,ASTM A105/ANSI B16.5 1.Standard:ANSI, DIN,JIS, BS 2.carbon/stainless/alloy/Aluminum ... steel Description of Flange: Production NameSO Flange RF,ANSI B16.5,UNIT WEI1GHT:5KG12",300#,ASTM A105/ Size1/4''-48'',DN8 ... pursuit daisy(at)dingshengsteel.com SO Flange RF,ANSI B16.5,UNIT WEI1GHT:5KG12",300#,ASTM A105/