SAE Washer, Flat Washer Type SAE, Dimensional Standards ASME B18.22.1 Type A Narrow, SAE Standard, Material Steel, Material Grade/Class Grade 8, Finish Zinc Yellow, For Screw Size 5/8 in, Inside Diameter 0.656 in, Outside Diameter 1 5/16 in, Maximum Thickness 0.095 in, System of Measurement Inch, Minimum Thickness 0.095 in, Color Yellow, Material Quality Standards ASTM F436, Pack Size Small Pack, Rockwell Hardness 38HRC, Thickness Tolerance +0.026/-0.021 in, Package Quantity 25 WARNING: This product can expose you to chemicals including Chromium (hexavalent compounds), which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov. - Lead