Square Washer Type Square Dimensional Standards ASTM A582 Material Stainless Steel Material Grade/Class Grade 2 Finish Plain For Screw Size 1 1/4 in Inside Diameter 1.313 in Square Width 3 in Maximum Thickness 0.515 in System of Measurement Inch Minimum Thickness 0.485 in Pack Size Small Pack Rockwell Hardness B83 Tensile Strength 90 000 psi Thickness Tolerance +/-0.031 in