2steel, 3.4820 in. Dia, 2.5000 in. W, bore 1.1562 in. Diameter by 1.5625 in. Deep, ream to 1.1885 in. Diameter b6 1.3750 in. Deep, open end to be vapor blasted and phosphate coated, 0.3120 in. Wide by 3.1210 in. Diameter groove around od 0.5000 in. From closed end