Steel, comp. Fs-8617, 6.374 in. Shoulder od, 0.719 in. W, groove 4.749 in. Diameter 0.375 in. W, 2.625 in. O/a lg, hub 6.000 in. Od, 5.512 in. Id, 1.063 in. Lg, 6 holes 0.272 in. Dia, 0.594 in. Dp w/0.313-24 nf-2b thd 0.469 in. Lg, 9 holes 0.156 in. Diameter drill through in 4.250 in. Groove diameter equally spaced