... ,A182F5,A182F11,.ect. Size:1/2''-60'' Pressure:150lbs-2500lbs flat welding flangeMaterial:A105/Q235,304/304L,316,316L,A182F5,A182F11 ... .D. of thematching pipe. A restriction is built into the bottom of the bore which sets asa shoulder for the pipe ... flow whenusing a socket welding flange. YH-0002 stainless stell flat welding flange