Extra Thick Washer Flat Washer Type Standard Material Steel Material Grade/Class Grade 5 Finish Black Oxide For Screw Size 5/8 in Inside Diameter 0.656 in Outside Diameter 1 3/8 in Maximum Thickness 0.187 in System of Measurement Inch Minimum Thickness 0.187 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/-0.020 in Package Quantity 5