SO Flange RF,12",300#,ASTM A105/ANSI B16.5 1.Standard:ANSI, DIN,JIS, ... /Aluminum steel Description of Flange:Production NameSO Flange RF,12",300#,ASTM A105/ANSI B16.5,UNIT WEIGHT:51KG Size1/4 ... B16.9, ANSI B16.28, DIN , ISO, EN,JIS,MSS SP, BSCarbon Steel 10# 20# Q235B A234 A105 A403Stainless Steel 1Cr18Ni9Ti ... in-house or Third Party inpection SO Flange RF,12",300#,ASTM A105/ANSI B16.5,UNIT WEIGHT:51KG