Lock for a motor vehicle lock system

A lock configured to be inserted and fixed in a receiving body of a motor vehicle comprising:

• a stator inside which a rotor is capable of being mobile in rotation, said stator comprising a means for fixing to said receiving body;
• a cover plate of the rotor fixed to a front face of said stator, said cover plate having an opening for passage of a key which cooperates with said rotor;
• a first anti-pulling-out means borne by said cover plate;
• a second anti-pulling-out means borne by said stator to fix said cover plate to said stator and to retain said rotor axially in said stator, wherein
• said first and second anti-pulling-out means are configured to block said cover plate axially on said stator by positioning of said cover plate on said stator and a subsequent pivoting of said cover plate on said stator into an assembled position;
• and
• a third anti-pulling-out means comprising an element for blocking in rotation of said cover plate on said stator, consisting of a part interposed between the cover plate and the front face of the stator,
• wherein said part comprises a means for fixing in rotation to the front face of said stator and a means for blocking in rotation of said cover plate, the means for blocking in rotation being active in said assembled position, and
• wherein said means for blocking in rotation consists of at least one resilient lug inclined toward a front of the lock in a resting position, the resilient lug being configured to cooperate with a groove borne by a rear face of said cover plate, in said assembled position.