Schedule 40 Weld Neck Flange Raised Face 1 1/2 in Nominal Pipe Size Flanged x Weld Neck 6 1/16 in Flange Outside Diameter 3/4 in Flange Thickness 2 11/16 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 3 7/8 in Bolt Circle Diameter 5/8 in Bolt Hole Diameter