SO Flange RF,12",300#,ASTM A105/ANSI B16.5 1. ... /alloy/Aluminum steel Description of Flange: Production NameSO Flange RF,ANSI B16.5,UNIT WEI1GHT:5KG12",300#,ASTM A105/ ... on flange , plate flange , Threaded flange, blind flangeInspection Factory in-house or Third Party inpection Ur demand is our pursuit ... daisy(at)dingshengsteel.com SO Flange RF,ANSI B16.5,UNIT WEI1GHT:5KG12",300#,ASTM A105/ ...