Flange, Raised, 4 in Nominal Pipe Size, Flanged x Blind, 10 3/4 in Flange Outside Diameter, 1 1/2 in Flange Thickness, 10 3/4 in Overall Length, Steel, Not Applicable, Class Class 600, For Pipe Schedule Schedule 80, 1, 450 psi @ 72 Degrees F Maximum Operating Pressure, 1, 450 psi Max. Steam Pressure, 80 Degrees to 780 Degrees F, Number of Bolt Holes 8, 7 7/8 in Bolt Circle Diameter, 7/8 in Bolt Hole Diameter