This is the standard nut and washer for Craftsman 10″ Table Saws in the 113.xxx series and others with a 5/8″ arbor. The washer is 2″ diameter the nut is 1″ diameter and has RH threads.
I’m a former woodshop teacher, cabinet and furniture maker, and avid tool collector. I’ve been collecting antique woodworking tools and restoring old Craftsman and Delta machines for almost forty years. I love the quality of the old Delta, Craftsman, Walker Turner, and other woodworking machinery from the 1940s through the ’70s. They just don’t make tools like that anymore and no one is going to be restoring woodworking tools purchased at big box stores fifty years from now. You can see my OldWoodworkingTools.com website about hand tools.