Threaded Flange Raised Face 1/2 in Nominal Pipe Size Flanged x FNPT 3 3/4 in Flange Outside Diameter 5/8 in Flange Thickness 7/8 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 2 5/8 in Bolt Circle Diameter 5/8 in Bolt Hole Diameter