... : ISO large diameter stainless steel forged flange class150/300/600/900 size1/2"-48"TypeLap-Joint Flange (LJ), Socket-welded Flange ... .American SeriesCLASS 150, CLASS 300, CLASS 400, CLASS 600, CLASS 900, CLASS 1500, CLASS 2500European SeriesPN 2.5, PN 6, PN ... strictly. large diameter stainless steel forged flange class150/300/600/900