Flat Washer Flat Washer Type Standard Material Nylon Material Grade/Class Grade 2 Finish Plain For Screw Size 5/16 in Inside Diameter 0.34 in Outside Diameter 47/64 in Maximum Thickness 0.062 in System of Measurement Inch Minimum Thickness 0.062 in Color Off-White Pack Size Small Pack Resistance Properties Abrasion Resistant Thickness Tolerance +/-0.005 in Package Quantity 40