12.8750" overall length four equally spaced keys on right end surface of body, 1.750 in. long, 0.375 in. wide, 0.1875 in. high; raised surface on right end surface of flange, 3.125 in. dia, 0.125 in. wide, 0.500 in. corner radius; nitride harden finish per B50R205, fscm 01289, navy spec. k-9495202 21c solid, external flange