Flanges Threaded, Slip-on, Socket Weld, Blind, Weld Neck Orifice, Anchor Flange & Spectical Blind RF/RTJ.Class Rating: 150, 300, 600, 900, 1500 & 2500. Material: A105, A350 LF2, A182 F304, 316, 321, F5, F9, F11, F22 & UNS31803.