Schedule 40 Socket Weld Flange Raised Face 1 1/2 in Nominal Pipe Size Flanged x Socket Weld 5 1/4 in Flange Outside Diameter 3/4 in Flange Thickness 1 3/16 in Overall Length Stainless Steel 316/316L Class Class 300 720 psi Maximum Operating Pressure 300 psi Max Steam Pressure Number of Bolt Holes 4 4 1/2 in Bolt Circle Diameter 7/8 in Bolt Hole Diameter