groove on od 0.063 in from end opposite flange 0.029 in p .003 m .000 w by 0.352 in porm 0.002 dia undercut, thd end opposite flange countersunk 90 deg by 0.344 in dia, hex flange with 2 holes 0.046 in min 0.056 in max dia drilled parallel to 2 hex flats passivate surface treated flange