Schedule 40 Socket Weld Flange Raised Face 1 in Nominal Pipe Size Flanged x Socket Weld 4 1/4 in Flange Outside Diameter 1/2 in Flange Thickness 11/16 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 3 1/8 in Bolt Circle Diameter 5/8 in Bolt Hole Diameter