Expansion anchor

An expansion anchor for insertion into a cylindrical hole of a mounting substrate, the anchor comprising:

• an anchor bolt having an insertion end and a threaded mounting end;
• an anchoring part disposed on said insertion end, said anchoring part including at least one expansion cone radially flaring toward said insertion end and defining a larger diameter portion and a smaller diameter portion, a cylindrical coating zone disposed about said larger diameter portion, and a cylindrical neck section defining a shoulder disposed about said smaller diameter portion;
• an expansion element coordinated with said expansion cone and having the shape of an axially fully slotted sleeve type expansion ring and having an insertion end and an outer end;
• a plurality of radial projections protruding beyond an outer shell of said expansion ring and distributed along the expansion ring circumference, an inside diameter of said projections being smaller than the largest cone diameter and larger than a diameter of said neck section, while an outside diameter of said projections at least equals the largest diameter of said anchor bolt, said projections fashioned as outwardly arched beads axially extending from said outer end to approximately a center of said expansion ring;
• and
• a plurality of incisions disposed in said expansion ring, said plurality of incisions axially extending from said insertion end to approximately a center of said expansion ring.