Steel, 0.750 in. Min, 0.875 in. Max id, splined id, 6 splines, 7.312 in. Od, 1.375 in. Thk 0/a, 1st end flange, 0.500 in. Thk flange, w/8 holes equally spaced on 6.625 in. Diameter bolt circle, 0.343 in. Diameter of holes, 2nd end, hub end, 1.375 in. Od hub