A unit comprised of a) a positive, demountable connection element for component connections, - which has a cone sleeve having a longitudinal axis of the cone sleeve, a conical inner jacket, a support surface running transverse to the longitudinal axis, and a cylindrical outer jacket, which has a structured, rough surface with profile peaks, - and which has a taper pin having an outer cone jacket that is in flat contact with the conical inner jacket, and which has a first coupling part, of b) an axial tensioning device, which has a second coupling part that can be detachably connected with the first coupling part, and which has a counter-support surface that is in contact with the support surface, wherein the second coupling part can be axially moved relative to the counter-support surface and, during a tensioning process, a relative movement takes place between the taper pin and cone sleeve, wherein the cone sleeve deforms between an initial position before the tensioning process and a tensioned position in the elastic area, wherein the outer diameter of the cylindrical outer jacket has a value D1 in the initial position, and a value D2 in the tensioned position, wherein D2 is greater than D1, and of c) a first component, - which has a first bore in which the connection element is located, wherein the inner diameter of the first bore is larger than D1, but smaller than D2, and wherein, in the tensioned state of the positive connection element, the profile peaks are plastically engaged in the material of the first bore, and have penetrated at least 3 micrometers, preferably at least 5 micrometers, into the material on the inner wall of the first bore, wherein the surface of the outer jacket is harder than the material of the first bore, characterized in that the rough surface is defined by the fact that it corresponds to a surface exhibited by sandpaper with a grain of between 50 and 1500, in particular between 80 and 1000, grain size according to CAMI. - which has a cone sleeve having a longitudinal axis of the cone sleeve, a conical inner jacket, a support surface running transverse to the longitudinal axis, and a cylindrical outer jacket, which has a structured, rough surface with profile peaks, - and which has a taper pin having an outer cone jacket that is in flat contact with the conical inner jacket, and which has a first coupling part, of b) an axial tensioning device, which has a second coupling part that can be detachably connected with the first coupling part, and which has a counter-support surface that is in contact with the support surface, wherein the second coupling part can be axially moved relative to the counter-support surface and, during a tensioning process, a relative movement takes place between the taper pin and cone sleeve, wherein the cone sleeve deforms between an initial position before the tensioning process and a tensioned position in the elastic area, wherein the outer diameter of the cylindrical outer jacket has a value D1 in the initial position, and a value D2 in the tensioned position, wherein D2 is greater than D1, and of c) a first component, - which has a first bore in which the connection element is located, wherein the inner diameter of the first bore is larger than D1, but smaller than D2, and wherein, in the tensioned state of the positive connection element, the profile peaks are plastically engaged in the material of the first bore, and have penetrated at least 3 micrometers, preferably at least 5 micrometers, into the material on the inner wall of the first bore, wherein the surface of the outer jacket is harder than the material of the first bore,