The invention relates to a detachable assembly device between two pieces, which is composed of two pieces forming a male female torque, and is configured to adopt two locking and unlocking positions. The male piece comprises a protrusion and a lock between the first and second parts of the protrusion, The internal thread part comprises two guide elements. The first element has a cross opening for receiving one part of the protrusion and a groove on the wall. The second element has an opening for receiving another part of the protrusion,The second part has a partial opening to fix the lock in the locking position, and the first part and the convex part each have a stop part which axially locks the two parts in the locking position, The stop lock is close to the bottom of the partial notch, and the two parts are axially locked along the second direction.Abstract figure: Figure 3
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