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Claim 1

IN COMBINATION, A MALE MEMBER AND A FEMALE MEMBER, BOTH HAVING PREFORMED INTERFERING MATING THREADS, THE CREST AND ROOT OF THE THREAD ON SAID MALE MEMBER BEING OF ARCUATE TRIANGULAR CROSS SECTION INCLUDING ARCUATELY CURVED SIDES AND INTERMEDIATE CIRCUMFERENTIALLY SPACED-APART LOBES, THE CREST OF SAID LOBES EXTENDING A GREATER DISTANCE OUTWARDLY FROM THE AXIS OF SAID MALE MEMBER THAN THE CREST OF THE THREAD PORTIONS INTERMEDIATE SAID LOBES, SAID LOBES MERGING SMOOTHLY AND GRADUALLY WITH THE THREAD PORTIONS OF SAID MALE MEMBER ON THE OPPOSITE SIDES THEREOF, THE INCLUDED ANGLE OF THE THREAD OF SAID MALE MEMBER BEING UNIFORM THROUGHOUT AND BEING SLIGHTLY LESS THAN THAT OF THE THREAD OF SAID FEMALE MEMBER WITH THE AXIAL DIMENSION OF THE THREAD OF THE MALE MEMBER RADIALLY OUTWARDLY OF A POINT INTERMEDIATE THE HEIGHT OF SAID LOBES BEING GREATER THAN THE AXIAL DIMENSION BETWEEN ADJACENT FLANKS OF THE THREAD OF THE FEMALE MEMBER OUTWARDLY OF SAID INTERMEDIATE POINT WHEREBY THE OPPOSITE FLANKS OF SAID LOBES HAVE PREDETERMINED MATERIAL INTERFERENCE WITH THE ADJACENT FLANKS OF THE THREAD OF SAID FEMALE MEMBER, SAID INTERFERENCE DIMINISHING PROGRESSIVELY TO ZERO IN THE CIRCUMFERENTIAL DIRECTION ON EACH OF THE OPPOSITE SIDES OF THE MIDPOINTS OF SAID LOBES, SAID INTERFERENCE INCREASING PROGRESSIVELY IN THE RADIAL DIRECTION ON EACH OF THE OPPOSITE SIDES OF SAID LOBES FROM ZERO AT SAID POINT INTERMEDIATE THE HEIGHT OF SAID LOBES TO A MAXIMUM AT THE OUTER EXTREMITY THEREOF, THE MAXIMUM DISTANCE OF THE CREST OF SAID LOBES FROM THE AXIS OF SAID MALE MEMBER BEING GREATER THAN THE DISTANCE OF THE ROOT OF THE THREAD OF SAID FEMALE MEMBER FROM SAID AXIS WHEREBY THE VREST OF SAID LOBES HAS PREDETERMINED INTERFERENCE WITH SAID ROOTS, THE ADJACENT FLANKS OF SAID THREADS OF SAID MALE AND FEMALE MEMBERS DIVERGING WITH RESPECT TO EACH OTHER INTO A SPACED-APART RELATIONSHIP FROM SAID ZERO POINT IN THE DIRECTION INWARDLY TOWRD THE AXIS OF SAID THREAD.