Assembly comprising a component and an axial limit stop device intended to be placed in a bore of said component in order to retain an element therein, in which: - the axial limit stop device is in one piece and comprises an annular ring which has symmetry of revolution about a central axis (I-I) and which extends along the central axis (I-I) between a proximal end and a distal end, - the axial limit stop device comprises at least one angular portion (3, 4) developing in an arc between a first end (3a, 4a), joined to the distal end of the annular ring, and a second, free end (3b, 4b), - the angular portion (3, 4) is in part movable radially from its first end (3a, 4a), in a transverse plane perpendicular to the central axis (I-I), between a retracted position and at least one protruding position, being elastically returned permanently to the protruding position, - in the retracted position, the angular portion (3, 4) is included within the volume of a cylinder continuing the outer cylindrical surface of the annular ring, - in the protruding position, the free end (3b, 4b) of the angular portion (3, 4) extends radially beyond the volume of the cylinder continuing the outer cylindrical surface of the annular ring, - said component bore extends along a first longitudinal axis (II-II) between a proximal end, with inlet orifice, and a distal end and is intended to receive the axial limit stop device oriented with its central axis (I-I) coaxial to the first longitudinal axis (II-II), characterized in that: - said component bore comprises a first component bore portion extending from the inlet orifice of the component bore, a second component bore portion following on from the first component bore portion and extending toward the distal end of the component bore, - the first component bore portion has a circular cross section with a diameter equal to or slightly greater than the external diameter of the annular ring, - the second component bore portion has at least one retaining seat (19, 20) which extends radially with respect to the first longitudinal axis (II-II) out from the volume of the cylinder continuing the cylindrical surface of the first component bore portion, said retaining seat (19, 20) being able to receive said at least one angular portion (3, 4) of the axial limit stop device in the protruding position, - the retaining seat (19, 20) has a proximal retaining face (21, 22) extending along a transverse plane substantially perpendicular to the first longitudinal axis (II-II) and connecting to the cylindrical lateral wall (T171a) of the first component bore portion, - the second component bore portion has at least one angular part (23, 24) of lateral surface (T172a) extending in the continuation of the cylindrical lateral surface (T171a) of the first component bore portion. - the axial limit stop device is in one piece and comprises an annular ring which has symmetry of revolution about a central axis (I-I) and which extends along the central axis (I-I) between a proximal end and a distal end, - the axial limit stop device comprises at least one angular portion (3, 4) developing in an arc between a first end (3a, 4a), joined to the distal end of the annular ring, and a second, free end (3b, 4b), - the angular portion (3, 4) is in part movable radially from its first end (3a, 4a), in a transverse plane perpendicular to the central axis (I-I), between a retracted position and at least one protruding position, being elastically returned permanently to the protruding position, - in the retracted position, the angular portion (3, 4) is included within the volume of a cylinder continuing the outer cylindrical surface of the annular ring, - in the protruding position, the free end (3b, 4b) of the angular portion (3, 4) extends radially beyond the volume of the cylinder continuing the outer cylindrical surface of the annular ring, - said component bore extends along a first longitudinal axis (II-II) between a proximal end, with inlet orifice, and a distal end and is intended to receive the axial limit stop device oriented with its central axis (I-I) coaxial to the first longitudinal axis (II-II), - said component bore comprises a first component bore portion extending from the inlet orifice of the component bore, a second component bore portion following on from the first component bore portion and extending toward the distal end of the component bore, - the first component bore portion has a circular cross section with a diameter equal to or slightly greater than the external diameter of the annular ring, - the second component bore portion has at least one retaining seat (19, 20) which extends radially with respect to the first longitudinal axis (II-II) out from the volume of the cylinder continuing the cylindrical surface of the first component bore portion, said retaining seat (19, 20) being able to receive said at least one angular portion (3, 4) of the axial limit stop device in the protruding position, - the retaining seat (19, 20) has a proximal retaining face (21, 22) extending along a transverse plane substantially perpendicular to the first longitudinal axis (II-II) and connecting to the cylindrical lateral wall (T171a) of the first component bore portion, - the second component bore portion has at least one angular part (23, 24) of lateral surface (T172a) extending in the continuation of the cylindrical lateral surface (T171a) of the first component bore portion.