Flat Washer Flat Washer Type Standard Material Nylon Material Grade/Class Grade 2 Finish Plain For Screw Size 1/2 in Inside Diameter 0.516 in Outside Diameter 1 1/4 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 20