<p>Spherical Washer, Low Carbon Steel, Black Oxide Finish, Fits Bolt Sizes 5/8 In, Inside Dia 21/32 In, Outside Dia 1 3/8 In, Thickness 5/16 In, Thickness Tolerance +/-0.010 In, Radius 1 3/4 In, Rockwell Hardness B49, For Use With Screws and Studs, Includes 1 Male Washers and 1 Female Washers</p> <p><br /><b>Features</b></p> <ul> <li>Finish: black oxide</li> <li>Includes: 1 Male Washers and 1 Female Washers</li> <li>Item: Spherical Washer</li> <li>Material: Low carbon steel</li> <li>Outside Dia.: 1-3/8&quot;</li> <li>Fits Bolt Sizes: 5/8&quot;</li> <li>Thickness: 5/16&quot;</li> <li>Rockwell Hardness: B49</li> <li>Thickness Tolerance: +/-0.010&quot;</li> <li>Female I.D.: 11/16&quot;</li> <li>Male I.D.: 21/32&quot;</li> <li>Radius: 1-3/4&quot;</li> </ul> <p></p>