ANSI B16.5 Forged Flanges

ASME/ANSI B16.5 covers forged steel pipe flanges and flanged fittings in sizes NPS 1/2 through NPS 24, in pressure Classes 150, 300, 400, 600, 900, 1500, and 2500. It is the most widely used flange standard in petrochemical, refining, and process industries worldwide. Select a pressure class below to view detailed dimensional data.