Blind Flange Raised Face 1 in Nominal Pipe Size Flanged x Blind 4 1/4 in Flange Outside Diameter 1/2 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