Tool for generating a thread, in particular an internal thread, a) wherein the tool is rotatable about a tool axis extending through the tool and is axially movable relative to the tool axis, b) wherein the tool comprises at least one thread generating area, c) wherein the thread generating area runs along a helix (G1, G2) with a predetermined thread pitch angle (δ) and a predetermined winding direction of the thread to be generated and has an effective profile which corresponds to the thread profile of the thread to be generated, d) wherein the thread generating area has at least one threading tooth which d1) has a threading tooth profile with a front threading tooth profile flank and a rear threading tooth profile flank, d2) has a front flank free surface directly adjoining the front threading tooth profile flank on a front threading tooth flank and d3) has a rear flank free surface directly adjoining the rear threading tooth profile flank on a rear threading tooth flank, e) wherein the front flank free surface is exposed or recessed rearwardly relative to a front threading tooth flank envelope extending along or parallel to the helix and through the front threading tooth profile flank, f) wherein the rear flank free surface is forwardly offset or exposed with respect to a rear transverse plane which is directed perpendicularly to the tool axis and passes through the rearmost point of the threading tooth profile or the rear threading tooth profile flank, g) wherein the helix (G1, G2) is inclined rearwardly relative to the rear transverse plane by the thread pitch angle (δ), characterised in that h) the rear flank free surface is inclined or set back relative to a rear threading tooth flank envelope extending along or parallel to the helix by a rear flank clearance angle (α2) which is greater than the thread pitch angle (δ) and lies in an interval between the thread pitch angle (δ) and 6°. a) wherein the tool is rotatable about a tool axis extending through the tool and is axially movable relative to the tool axis, b) wherein the tool comprises at least one thread generating area, c) wherein the thread generating area runs along a helix (G1, G2) with a predetermined thread pitch angle (δ) and a predetermined winding direction of the thread to be generated and has an effective profile which corresponds to the thread profile of the thread to be generated, d) wherein the thread generating area has at least one threading tooth which d1) has a threading tooth profile with a front threading tooth profile flank and a rear threading tooth profile flank, d2) has a front flank free surface directly adjoining the front threading tooth profile flank on a front threading tooth flank and d3) has a rear flank free surface directly adjoining the rear threading tooth profile flank on a rear threading tooth flank, d1) has a threading tooth profile with a front threading tooth profile flank and a rear threading tooth profile flank, d2) has a front flank free surface directly adjoining the front threading tooth profile flank on a front threading tooth flank and d3) has a rear flank free surface directly adjoining the rear threading tooth profile flank on a rear threading tooth flank, e) wherein the front flank free surface is exposed or recessed rearwardly relative to a front threading tooth flank envelope extending along or parallel to the helix and through the front threading tooth profile flank, f) wherein the rear flank free surface is forwardly offset or exposed with respect to a rear transverse plane which is directed perpendicularly to the tool axis and passes through the rearmost point of the threading tooth profile or the rear threading tooth profile flank, g) wherein the helix (G1, G2) is inclined rearwardly relative to the rear transverse plane by the thread pitch angle (δ), characterised in that h) the rear flank free surface is inclined or set back relative to a rear threading tooth flank envelope extending along or parallel to the helix by a rear flank clearance angle (α2) which is greater than the thread pitch angle (δ) and lies in an interval between the thread pitch angle (δ) and 6°.