Abstract: The invention is directed to an anchoring bolt device for insertion into a material having a predrilled bore formed therein. The anchoring bolt device includes a sleeve-like body defining a longitudinal axis and having an upper portion, a mid portion and a lower portion having a bottom end face defining an opening. The body has a bore formed therein so as to extend along the axis and through the upper portion and the mid portion. A passage is formed in the lower portion of the sleeve-like body and extends from the bore and along the axis to terminate in the opening formed in the end face. The passage has a tapered inner wall surface so that the diameter of the passage becomes narrower toward the bottom end face. The lower portion of the sleeve-like body is partitioned into a plurality of legs extending in the direction of the axis. A ball is disposed in the bore so as to rest against the tapered inner wall surface and a thread is formed in the bore so as to extend along the upper portion.