... .47 Type : WNF, SO, SWF, BL, OF,LF,PL a105 gr b flange size 1/2" to 24" ASME B16.526 ... ,PN20,PN25,PN40/ Class A, B, C, D, EstandardASME B16.5, ASME B16.47, ASME B16.36,DIN 86341-2000, DIN2505materialCarbon ... , construction, etcSpecial design available as the requirement of customer a105 gr b flange