Threaded Flange Raised Face 1/2 in Nominal Pipe Size Flanged x FNPT 3 1/2 in Flange Outside Diameter 3/8 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 4 5/8 in Bolt Circle Diameter 1/2 in Bolt Hole Diameter 14 Flange Fitting Threading