Used on sh-2g(a) seasprite helicopter. 0.755" overall width 4340 steel; i.v.d. aluminum coated; internal threads 1.375 in. dia. by 16 threads per inch, unj thread series, threaded class 3b; heat treated to 140 - 170 ksi tensile strength rc 32 to 38; counterbore 1.380 to 1.410 in. dia. with countersink angle of 90 deg. both ends; internal involute spline with 28 teeth, a major dia. of 1.838in. max.,
