Abstract: An injection-molding tool for producing pipe fittings with an internal groove has bead-forming segments of the core alternating with one another on respective bell crank levers at alternating bell-crank levers being fulcrummed at fixed locations on a core sleeve while the other bell-crank levers are fulcrummed on a ring movable axially on the core sleeve. The actuator is a hydraulically or pneumatically moved actuating sleeve having grooves or slits receiving radial arms of the levers with abutments or end surfaces axially staggered so that one group of segments is retracted inwardly and axially first to allow the second group of segments to be swung inwardly.