1.Size:1/2"-80" 2.Pressure:class600 3.Material:ASTM A694 F65 4.Standard:ASME B16.5 5.Certificate:API,ISO,CE,eg astm a105n carbon steel weld neck flange size 1/2" to 24" ASME B16.5 24"to 80" ASME B16.47TypeWNF, SO, SWF, BL, OF,LF,PLFaceRF, FF, MF, MFM, RJ, TG, RTJ, SRF,PressureClass 150Lbs, 300Lbs, 600Lbs, 900Lbs, 1500Lbs, 2500Lbs,Etc /PN6,PN10,PN16,PN20,PN25,PN40/ Class A, B, C, D, EstandardASME ...