Anchoring bolt

Anchoring bolt for rotatable insertion into a cylindrical bore and capable of conically undercutting said bore and securing itself in the undercut bore, comprising a shaft, a connection portion extending from said shaft at one end thereof for connections to the bolt outside of the bore in which the bolt may be set, an insertion portion extending from said shaft at the other end thereof for insertion in a bore along with at least part of said shaft, said insertion portion having a slot running axially and separating said insertion portion into two branches capable of being spread apart from each other, a spreading wedge having its tapered-down end extending into said slot, and a plurality of protuberant inserts near the free end of said insertion portion projecting from said insertion portion;

• said inserts (16,17) being set in the end face (11,12) of said insertion portion (5) and respectively having median lines in the direction of projection from said end face which are obliquely inclined to the direction of the longitudinal axis of said insertion portion and of said shaft, and
• the protuberant ends of said inserts having leading edge portions (29) in the direction of rotation of said bolt, which project further from said insertion portion than their trailing edge portions (31).