Flat Washer, Flat Washer Type Standard, Dimensional Standards TCMA, Material Stainless Steel, Material Grade/Class 18-8, Finish Plain, For Screw Size 1/2 in, Inside Diameter 0.531 in, Outside Diameter 1 1/8 in, Maximum Thickness 0.141 in, System of Measurement Inch, Minimum Thickness 0.109 in, Color Silver, Maximum Temperature 750 Degrees F, Rockwell Hardness B97, Thickness Tolerance +/-1/64 in, Package Quantity 25