Threaded Flange Raised Face 4 in Nominal Pipe Size Flanged x FNPT 9 in Flange Outside Diameter 7/8 in Flange Thickness Steel Anodized Class Class 150 For Pipe Schedule 40 150 psi Maximum Operating Pressure -29 Degrees to 425 Degrees F Number of Bolt Holes 8 3/4 in Bolt Circle Diameter 5/8 in Bolt Hole Diameter 8 Flange Fitting Threading