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