Self-locking nut

Claim 1

A SELF-LOCKING NUT USABLE FROM EITHER END OF A COACTING THREAD PART AND ADAPTED TO BE TIGHTENED AGAINST AN OPPOSING FLAT SURFACE, SAID NUT COMPRISING, INCOMBINATION, A HEXAGONAL NUT BODY HAVING SUBSTANTIALLY FLAT SIDE FACES INTERSECTING AT CORNERS AND LIKE END SURFACES IN OPPOSED RELATIONSHIP TO ONE ANOTHER, SAID NUT BODY HAVING A THEREADED CENTRAL OPENING EXTENDING AXIALLY BETWEEN THE END SURFACES AND WHICH IS NORMALLY FREE RUNNING ON THE COACTING THREADED PART, SAID END SURFACES EACH BEING SUBSTANTIALLY SYMMETRICAL IN CONTOURS AND STRUCTURE ON OPPOSITE SIDES OF A CENTRAL PLANE PASSING THROUGH THE CENTERS OF OPPOSED SIDE FACES AND AXIALLY OF THE NUT BODY, SAID END SURFACES HAVING RECESSES OF LIKE SIZE AND CONCAVELY CURED SECTION AND NARROWER THAN THE DIAMETER OF SAID THREADED CENTRAL OPENING EXTENDING THEREACROSS IN OPPOSED RELATIONSHIP TO ONE ANOTHER TO PROVIDE A FLEXURE REGION OF REDUCED SECTION ACROSS THE MID-PORTION OF THE NUT BODY IN ONE DIRECTION, AND SAID END SURFACES HAVING SURFACE PORTIONS ON OPPOSITE SIDES OF SAID RECESSES WHICH ARE EACH SUBSTANTIALLY FLAT AND WHICH NORMALLY EXTEND AWAY FROM ONE ANOTHER LATERALLY OF EACH OF THE RECESSES IN OBTUSE ANGULAR RELATIONSHIP TO ONE ANOTHER AND HAVE MID-REGIONS EXTENDING PRACTICALLY TO OPPOSED CORNERS OF THE NUT BODY, THE ANGLE BETWEEN SAID FLAT SURFACE PORTIONS OF EACH END SURFACE BEING BETWEEN 168* AND 172*, SO THAT INITIAL CONTACTS THEREOF AGAINS SAID FLAT OPPOSING SURFACE ARE ONLY NEAR SAID OPPOSIED CORNERS OF THE NUT BODY AND THE NUT BODY IS FLEXED SUFFICIENTLY TO TAKE A PERMANENT SET AT SAID FLEXURE REGION WHEN SAID FLAT SURFACE PORTIONS BOTTOM AGAINST THE FLAT OPPOSING SURFACE WHEN THE NUT IS TIGHTEND AND THEREBY LIMIT THE FLEXURE OF THE NUT BODY TO A PREDETERMINED AMOUNT.