Bronze, 6.190 in. O/a lg, 3.737 in. Dia, counterbored on thded end 3.150 in. Dia, 3.190 in. Lg, internal l/h thds 1.750 in. Lg, four grooves equally spaced on outer periphery located 0.880 in. From end, 0.250 in. W, 0.250 in. Deep and 0.220 in. Apart, 2.938 in. Id at unthd end