USS Washer, Flat Washer Type USS, Dimensional Standards ASME B18.22.1 Type A Wide, USS Standard, Material Steel, Material Grade/Class Grade 8, Finish Zinc Yellow, For Screw Size 1 1/4 in, Inside Diameter 1.375 in, Outside Diameter 3 in, Maximum Thickness 0.165 in, System of Measurement Inch, Minimum Thickness 0.165 in, Color Yellow, Material Quality Standards ASTM F436, Pack Size Small Pack, Rockwell Hardness 38HRC, Thickness Tolerance +0.027/-0.029 in, Package Quantity 5 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