A locking finger for a unit having a molding cavity for molding the container delimited at least by a first shell attached to a first mold carrier and by a second shell attached to a second mold carrier that is movable relative to the first mold carrier between an open position and a closed position, the first mold carrier comprising a control member for controlling the locking finger and the second mold carrier comprising a locking opening, the locking finger comprising an interface for mechanical coupling to the control member, and a locking portion designed to cooperate with the locking opening in the closed position. The molding unit is a subassembly of a plurality of mechanical parts assembled together rigidly, including a main body of the finger comprising the mechanical coupling interface, and said locking portion, which is a main sleeve made from anti-friction material assembled on the main body.