Schedule 40 Socket Weld Flange Raised Face 1 1/4 in Nominal Pipe Size Flanged x Socket Weld 4 5/8 in Flange Outside Diameter 9/16 in Flange Thickness 13/16 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 1/2 in Bolt Circle Diameter 5/8 in Bolt Hole Diameter