Square Washer Type Square Dimensional Standards ASTM A582 Material Stainless Steel Material Grade/Class Grade 2 Finish Plain For Screw Size 3/4 in Inside Diameter 0.813 in Square Width 6 in Maximum Thickness 0.39 in System of Measurement Inch Minimum Thickness 0.36 in Pack Size Small Pack Rockwell Hardness B83 Tensile Strength 90 000 psi Thickness Tolerance +/-0.031 in