USS Washer Flat Washer Type USS Dimensional Standards ASME B18.22.1 Material Steel Material Grade/Class Grade 2 Finish Zinc Plated For Screw Size 1 3/4 in Inside Diameter 1.875 in Outside Diameter 4 in Maximum Thickness 0.188 in System of Measurement Inch Minimum Thickness 0.188 in Pack Size Small Pack RoHS Compliant Yes Package Quantity 132