Matl steel, qq-s-624, class 4140, machine finish, flange end 2.375 in. Od, groove 2.125 in. Dia, flange 1.750 in. Dia, raised face 0.031 in. H, bore 0.880 in. Dia, 0.125 in. Deep, flange 0.281 in. Thk, plain end 1.117 in. Od, 0.7555 plus 0.0005, minus 0.0000 in., 0.875 in. H