Assembly group for a press fitting , having: - a substantially cylindrical ferrule with a pressing region ; and - a stop ring which is secured to a first axial end of the ferrule and delimits the pressing region in an axial direction of the ferrule , wherein the stop ring has the following: - a first internal contour on a side opposite the pressing region , for attaching the assembly group to a fitting body of the press fitting ; - a first circular segment and a second circular segment , adjacent thereto, that extends over a smaller part of the first internal contour than the first circular segment ; - a cross section, which is constant in the region of the first circular segment , with a bevel having a clear inside diameter that decreases from the side opposite the pressing region in the axial direction of the assembly group ; and - an element which is arranged in the region of the second circular segment and projects inwards beyond the constant cross section of the first circular segment , characterized in that - the element arranged in the region of the second circular segment has an insertion chamfer , and - an inclination angle of the insertion chamfer is greater than an inclination angle of the bevel , in each case with respect to the axis of symmetry (A S ) of the assembly group , and/or a surface of the insertion chamfer is arranged so as to be offset inwards in a radial direction with respect to a corresponding surface of the bevel , such that when the assembly group is attached to the fitting body , the element causes an axis of symmetry (A S ) of the ferrule to be tilted relative to a central axis (A F ) of the fitting body . - a substantially cylindrical ferrule with a pressing region ; and - a stop ring which is secured to a first axial end of the ferrule and delimits the pressing region in an axial direction of the ferrule , wherein the stop ring has the following: - a first internal contour on a side opposite the pressing region , for attaching the assembly group to a fitting body of the press fitting ; - a first circular segment and a second circular segment , adjacent thereto, that extends over a smaller part of the first internal contour than the first circular segment ; - a cross section, which is constant in the region of the first circular segment , with a bevel having a clear inside diameter that decreases from the side opposite the pressing region in the axial direction of the assembly group ; and - an element which is arranged in the region of the second circular segment and projects inwards beyond the constant cross section of the first circular segment , - a first internal contour on a side opposite the pressing region , for attaching the assembly group to a fitting body of the press fitting ; - a first circular segment and a second circular segment , adjacent thereto, that extends over a smaller part of the first internal contour than the first circular segment ; - a cross section, which is constant in the region of the first circular segment , with a bevel having a clear inside diameter that decreases from the side opposite the pressing region in the axial direction of the assembly group ; and - an element which is arranged in the region of the second circular segment and projects inwards beyond the constant cross section of the first circular segment , - the element arranged in the region of the second circular segment has an insertion chamfer , and - an inclination angle of the insertion chamfer is greater than an inclination angle of the bevel , in each case with respect to the axis of symmetry (A S ) of the assembly group , and/or a surface of the insertion chamfer is arranged so as to be offset inwards in a radial direction with respect to a corresponding surface of the bevel , such that when the assembly group is attached to the fitting body , the element causes an axis of symmetry (A S ) of the ferrule to be tilted relative to a central axis (A F ) of the fitting body . <EOS>