Steel o/a, 0.585 in. Shaft diameter 10.375 in. Shaft lg, 3.250 in. Weight assembly dia., shaft internally thd on one end 0.313-24 unf thd size 0.750 in. Deep, one end of shaft has splines, 0.760 in. Major dia, 0.655 in. Minor dia. 0.915 in. Lg, 20splines