SAE Washer Flat Washer Type SAE Dimensional Standards ASME B18.22.1 Material Steel Material Grade/Class Grade 2 Finish Zinc Plated For Screw Size 5/8 in Inside Diameter 0.656 in Outside Diameter 1 5/16 in Maximum Thickness 0.094 in System of Measurement Inch Minimum Thickness 0.094 in Pack Size Bulk Pack Rockwell Hardness B49 Thickness Tolerance +/-0.025 in Package Quantity 1800