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 0.031 in.17 in, Pack Size Small Pack, Rockwell Hardness B83, Tensile Strength 90,000 psi, Thickness Tolerance +/-0.688 in, Square Width 2 in, Maximum Thickness 0.