Schedule 40 Socket Weld Flange Raised Face 3/4 in Nominal Pipe Size Flanged x Socket Weld 3 7/8 in Flange Outside Diameter 1/2 in Flange Thickness 5/8 in Overall Length Stainless Steel 304/304L Class Class 150 275 psi Maximum Operating Pressure 150 psi Max Steam Pressure Number of Bolt Holes 4 2 3/4 in Bolt Circle Diameter 5/8 in Bolt Hole Diameter