carbon steel forged long welding neck flange1.Size:4'' * 150lbs 2.Material: A105 3.Standard:ANSI B16.5 4.Certification:API carbon steel forged long welding neck flangesize 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, ...