Schedule 40 Weld Neck Flange Raised Face 4 in Nominal Pipe Size Flanged x Weld Neck 10 in Flange Outside Diameter 1 1/4 in Flange Thickness 3 3/8 in Overall Length Stainless Steel 304/304L Class Class 300 720 psi Maximum Operating Pressure 300 psi Max Steam Pressure Number of Bolt Holes 8 7 1/2 in Bolt Circle Diameter 3/4 in Bolt Hole Diameter