System for securing an anchor in a mineral substrate

A system for fastening an anchor in a borehole in a mineral substrate, in particular concrete, mortar or masonry, comprising

• an anchor having a core section and a thread section, the core section having a core diameter dK and the thread section having an outer diameter dG, and
• a grooving tool, different from said anchor, for grooving an internal thread in the borehole, the grooving tool comprising the following:
• a base body having a leading and a trailing end, a force application device being provided, via which a torque for screwing the grooving tool into the borehole and for grooving the thread is transmitted to the base body, the base body having an outer surface on which a grooving thread is formed, which is suitable for grooving the internal thread into the wall of the borehole, characterized in that a plurality of elevations are formed on the outer surface of the base body, each having a cutting edge, wherein at least a section of all cutting edges lie on an imaginary cylinder having a diameter do, and wherein the cutting edges are suitable to at least partially remove the inner wall of the borehole when screwing the grooving tool into the borehole in order to adapt the inner wall of the borehole to the imaginary cylinder.