Mold for forming plastic Luer nuts

A mold for forming internally threaded plastic nuts which have a polygonal internal cross-section of n number of sides, comprising:

• a housing having first and second plates meeting along a parting line;
• said first plate having a cavity therein, said cavity having a wall with n number of fixed sectors and n number of movable sections arranged circumferentially around a central axis of said cavity, each movable sector being radially movable relative to said central axis and further being disposed between a respective pair of fixed sectors;
• holding means coupled to the first plate for maintaining the movable sectors in fixed relationship with the fixed sectors while a threaded nut is being formed;
• an externally threaded core having a polygonal external cross-section with n number of sides coupled to the second plate and longitudinally extending into spaced relationship with the cavity wall, so that said threaded nut can be formed between an outer surface of the threaded core and an inner surface of the cavity wall;
• and
• turning means coupled to the housing for rotating the threaded core after the holding means has released the movable sectors.