Quick fastener for threaded rods

A quick fastener (1) for with external profiling (3) provided with bolt (2) comprises a receiving part (4) for the bolt (2) which is provided with a bore (5) in which at least one locking element (10) is arranged, the form-fitting manner in the outer profilings (3) engages. The bore (5) in the receiving part (4) tapering at least in sections (9) in the direction of its Einsteckmundung (6). The at least one locking element (10) is formed by a radially elastically expandable ring body (I) is held non-displaceably in the bore (5) in the insertion direction and in the holding portion against the inner wall (7) of the bore (5) projects. The clear width (w) of the elastic annular body (10) is smaller than the diameter (d) of the bore (5) on its Einsteckmundung (6).