Square Washer Type Square Dimensional Standards ASTM A582 Material Stainless Steel Material Grade/Class Grade 2 Finish Plain For Screw Size 5/8 in Inside Diameter 0.688 in Square Width 2 in Maximum Thickness 0.2 in System of Measurement Inch Minimum Thickness 0.17 in Pack Size Small Pack Rockwell Hardness B83 Tensile Strength 90 000 psi Thickness Tolerance +/-0.031 in