ANSI/ASME Flange Dimensions & Tolerances Chart – PSC – ANSI/ASME B16.5 Flange Catalogue Download ANSI / ASME B16.5 Flange Class 150, 300, 400, 600, 900, 1500, 2500 Sizes :1/2″ to 24″ NPS. Flange Facing : RF, FF, RTJ, MF. Types : Welding Neck, Slip On, Blind, Socket Weld, Threaded,