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