Flat Washer Flat Washer Type Standard Material Nylon Material Grade/Class Grade 2 Finish Plain For Screw Size 1/4 in Inside Diameter 0.252 in Outside Diameter 15/32 in Maximum Thickness 0.059 in System of Measurement Inch Minimum Thickness 0.059 in Color Off-White Pack Size Small Pack Resistance Properties Abrasion Resistant Thickness Tolerance +/-0.005 in Package Quantity 40