Tool holder having a collet holder and a tool insert for use in a tool holder

A system comprising a tool holder having a collet holder, whereby the collet holder includes a conical borehole having a central axis and a thread that is arranged so as to be coaxial with respect to the central axis, whereby the thread cooperates with a first clamping nut when a collet is clamped to the collet holder and wherein the conical borehole is a centering means for the collet, and wherein the collet holder further includes a separate means to center a tool insert, the means to center a tool insert configured in an axial direction parallel to the central axis and positioned between a first end of the conical borehole proximate the thread in the axial direction and the thread, wherein the means to center a tool insert is configured as at least one selected from a group including a short taper, a cylinder, and a polygon, the system further comprising a tool insert, wherein the tool insert has a counterpart surface that directly, physically abuts the means for centering a tool insert, wherein the counterpart surface of the tool insert is configured as at least one selected from a group including an external cone, a cylinder, and as a polygon, wherein the tool insert includes a means for attaching the tool insert within the tool holder, wherein the means for attaching the tool insert with the tool holder is configured as a second clamping nut having an external thread or an internal thread configured to cooperate with the thread of the collet holder, such that both the first clamping nut and the second clamping nut are each separately configured to engage the thread of the collet holder, wherein the second clamping nut is configured to be rotatably supported on the tool insert, and is configured to transmit axial forces that are required to attach the tool insert within the tool holder.