Jumbo Washer Flat Washer Type Oversized Dimensional Standards AMPG 2001 FL.05 Material Steel Material Grade/Class Grade 2 Finish Black Oxide For Screw Size 2 in Inside Diameter 2.125 in Outside Diameter 3 3/4 in Maximum Thickness 0.125 in System of Measurement Inch Minimum Thickness 0.125 in Color Black Inside Diameter Tolerance +/-0.010 in Material Quality Standards ASTM A108 Outside Diameter Tolerance +/-0.010 in Pack Size Small Pack Rockwell Hardness C40