Blind Flange Raised Face 1 in Nominal Pipe Size Flanged x Blind 4 7/8 in Flange Outside Diameter 11/16 in Flange Thickness 11/16 in Overall Length Stainless Steel 316/316L Class Class 300 720 psi Maximum Operating Pressure 300 psi Max Steam Pressure Number of Bolt Holes 4 3 1/2 in Bolt Circle Diameter 3/4 in Bolt Hole Diameter