ANSI b16.5 150 LBS screwed flange 1) material :stainless steel 2) standard :ANSI, ... ), Welding-Neck Flange (WN), Threaded Flange (TH), etc.American SeriesCLASS 150, CLASS 300, CLASS 400, CLASS 600, CLASS 900, CLASS 1500 ... /600/900 stainless steel forged screwed flange ANSI b16.5 150 lbs screwed flange