Abstract: A mold for making annular polymeric articles comprising a core having an outer contoured surface for placing a workpiece thereon, two half-molds with holes for discharging excess polymer embracing the contoured surface of the core and partially embracing end faces of the core in the course of radial displacement of the half-molds during press-forming of the article, and a means for pressure-sealing a forming cavity of the mold. The half-molds have in the area where they are joined a width equal to the length of the generating line of the core, whereas the pressure-sealing means includes two members rigidly affixed on one of the half-molds at the opposite sides thereof. Each member has at the side facing the half-molds the form of a closure embracing these half-molds in the area where they are joined, and by their shelves embracing part of the end faces of the half-molds and core during press-forming.