Abstract: A floating bar, ball bearing, dead bolt-type lock comprising rotatable plug means disposed within stationary core means and carrying a bolt rest means engagable with a reciprocal bolt member for selectively moving the bolt member between locked and unlocked positions. Floating bar means having cooperating elements disposed in both the plug means and core means retain ball bearing means in preselected positions for riding along one edge of the proper key in order to permit movement of the bolt member to an open position, and to permit movement of the bolt member to a closed position, and to substantially preclude picking of the lock.