Fitting for intermediate closure system

The invention relates to an intermediate fitting (1) for closure (S) having an opening (O) pivotally mounted on a fixed frame (C). Such intermediate fitting (1) comprises: - a keeper (2), comprising an active part (20) and intended to be made integral with the fixed frame (C), respectively of the opening (O); - a hooking member (3) having an active portion (30) and intended to be made integral with the opening (O), respectively of the fixed frame (C); - wherein the active portion (20) of the striker (2) and the active part (30) of the hooking member (3) are designed to cooperate with each other, this at least in the closed position of the leaf (O ) relative to the fixed frame (C). This intermediate fitting (1) is characterized in that the hooking member (3) comprises, firstly, a base (4) intended to be secured to the opening (O), respectively of the fixed frame (C ), and, secondly, a coupling member (5) having the active part (30) of the hooking member (3) and, on yet another hand, displacement in mounting means (6) of the fastening member (5) relative to the base (4), this between an extended position and a retracted position relative to the base (4).