Steel mil-s-8844 comp 300m cl 3, titanium cadmium plate mil-std-1500 cl1 type 2, 14.470 in. O/a lg, 3.368 in. Min to 3.370 in. Max diameter bore thru, 3.875-16 unj-3a thd 1.310 in. Lg 1.125in. From each end, machined surfaces 8.0 16.0 32.0 and 50.0 microinch finish, heat treat 270000 to 300000 psi