Full Face Flange Gasket Gasket Material Graphite Insert Material 316 Stainless Steel For Pipe Size 4 in For Flange ANSI Class 150 Binder Material None Color Gray Inside Diameter 4 1/2 in Minimum Operating Temperature -400 Degrees F Maximum Operating Temperature 975 Degrees F Outside Diameter 9 in Thickness 1/8 in Number of Bolt Holes 8 Bolt Hole Diameter 3/4 in Gasket Type Full-Face Gasket Metal Detectable Gasket No Included Fasteners Not Applicable Hardness Not Rated