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Claim 1

A SELF-LOCKING MALE MEMBER HAVING A CONTINUOUS EXTERNAL ROLLED THREAD, A FEMALE MEMBER FORMED WITH AN APERTURE AND HAVING A CONTINUOUS INTERNAL FEMALE THREADED MATING WITH SAID MALE THREAD, THE ROOT OF SAID MALE THREAD EXTENDING GENERALLY HELICALLY BUT IN EACH OF AT LEAST SEVERAL CONVOLUTIONS HAVING CIRCUMFERENTIALLY UNIFORMLY SPACED LANDS LOCATED FARTHER FROM THE AXIAL CENTER OF SAID MALE MEMBER THAN THE INTERVENING PORTIONS THEREOF, SAID LANDS AND INTERVENING PORTIONS MERGING AND BLENDING SMOOTHLY WITH ONE ANOTHER, THE CREST OF SAID FEMALE THREAD EXTENDING GENERALLY HELICALLY AND, IN THOSE CONVOLUTIONS MATING WITH THE AFORESAID CONVOLUTIONS OF SAID MALE THREAD HAVING A PREDETERMINED MATERIAL INTERFERENCE WITH SAID LANDS BUT BEING SPACED FROM SAID INTERVENING PORTIONS WHEREBY TO PROVIDE VOIDS BETWEEN SAID CRESTS AND INTERVENING PORTIONS, THE ENGAGED ROOTS OF SAID MALE THREAD AND CREST OF SAID FEMALE THREAD IN THE AFORESAID MATING CONVOLUTIONS BEING OF SUBSTANTIAL WIDTH MEASURED AXIALLY TO PROVIDE BROAD LOAD-BEARING SURFACES, THE CROSS DIMENSION OF THE AXIAL PROJECTION OF THE ROOT OF SAID MALE MEMBER IN THE AFORESAID CONVOLUTIONS THEREOF MEASURED THROUGH THE AXIS OF SAID MALE MEMBER BEING THE SAME AT EVERY ANGLE, THE AXIS OF SAID MALE MEMBER COINCIDING WITH THE CENTER OF THE CYLINDER WITHIN WHICH SAID AXIAL PROJECTION IS INSCRIBED.