Flat Washer Flat Washer Type Standard Dimensional Standards AMPG 2001 FL.03 Material Phenolic Resin Material Grade/Class Grade 2 Finish Plain For Screw Size 1/4 in Inside Diameter 0.281 in Outside Diameter 5/8 in Maximum Thickness 0.062 in System of Measurement Inch Minimum Thickness 0.062 in Color Tan Inside Diameter Tolerance +/-0.010 in Outside Diameter Tolerance +/-0.010 in Pack Size Small Pack Thickness Tolerance +0.005/-0.004 in Package Quantity 5