Thick Washer, Flat Washer Type Standard, Material Steel, Material Grade/Class Grade 5, Finish Black Oxide, For Screw Size #8, Inside Diameter 0.188 in, Outside Diameter 7/16 in, Maximum Thickness 0.078 in, System of Measurement Inch, Minimum Thickness 0.078 in, Color Black, Inside Diameter Tolerance +/-0.010 in, Outside Diameter Tolerance +/-0.010 in, Pack Size Small Pack, Rockwell Hardness C4, Thickness Tolerance +0.005/-0.004 in, Package Quantity 25