Professional manufacturer SO flange in China, ansi b16.5 SO, WN, bland flange(class150-1500). Size:1/2"-80" WT ... to 24" ASME B16.526"to 80" ASME B16.47TypeWNF, SO, SWF, BL, OF,LF,PLFaceRF, FF, MF, MFM ... 900Lbs, 1500Lbs, 2500Lbs, /PN6,PN10,PN16,PN20,PN25,PN40/ Class A, B, C, D, EstandardASME B16.5, ASME ... Flanges GOST12821-80Pressure Class:PN=0.6--PN10,0 (100 /2)SIZE: 1/2" TO 48 Class 400 14" SO flange