... .Standard:ANSI B16.5 4.Qualification;API,ISO,CE asme spectacle blank flange pn10 size 1/2" to 24" ASME B16.5 24 ... , SRF,PressureClass 150Lbs, 300Lbs, 600Lbs, 900Lbs, 1500Lbs, 2500Lbs,Etc /PN6,PN10,PN16,PN20,PN25,PN40/ Class A, B, C, D, EstandardASME ... ,construction, etcSpecial design available as the requirement of customer asme spectacle blank flange pn10