Thick Washer Flat Washer Type Standard Dimensional Standards AMPG 2001 FL.06 Material Steel Material Grade/Class Grade 8 Finish Zinc Yellow For Screw Size 1/4 in Inside Diameter 0.281 in Outside Diameter 5/8 in Maximum Thickness 0.108 in System of Measurement Inch Minimum Thickness 0.09 in Color Yellow Inside Diameter Tolerance +/-0.010 in Outside Diameter Tolerance +/-0.010 in Pack Size Small Pack Rockwell Hardness C43 Thickness Tolerance +0.005/-0.004 in Package Quantity 100