Cap nut

Claim 1

A CAP NUT WHICH COMPRISES: A BODY MEMBER HAVING A WRENCHING SURFACE HAVING A THROUGH, THREADED BORE, AND HAVING A COUNTERBORE AT ONE END THEREOF, THE BOTTOM OF THE COUNTERBORE TAPERING DOWNWARDLY AT AN OBTUSE ANGLE RELATIVE TO THE BORE; AN ANNULAR, SUBSTANTIALLY AXIALLY EXTENDING FLANGE ON THE BODY MEMBER, THE INNER SURFACE OF THE FLANGE BEING DEFINED BY THE COUNTERBORE; A HOLLOW CAP MEMBER OF SOFTER MATERIAL THAN THE MATERIAL OF THE BODY MEMBER, SAID CAP MEMBER HAVING A CLOSED HEMISPHERICAL DOME SECTION AND A CYLINDRICAL BODY SECTION, THE INSIDE DIAMETER OF THE BODY SECTION BEING SUBSTANTIALLY EQUIVALENT TO THE MINIMUM THREAD DIAMETER OF THE BORE, AND SAID CAP MEMBER HAVING A BEVELLED BASE, THE BEVEL OF THE BASE CORRESPONDING TO THE OBTUSE ANGLE OF THE BOTTOM OF THE COUNTERBORE; AND A BEVELLED BASE, THE BEVEL OF THE BASE AND FACING IN THE DIRECTION OF THE BODY MEMBER, SAID SHOULDER BEING DEFINED BY AN ANNULAR RECESS IN THE OUTER SURFACE OF THE BODY SECTION OF THE CAP MEMBER ADJACENT THE BASE, THE CAP MEMBER BEING POSITIONED IN THE COUNTERBORE WITH THE BASE SEATED ON THE FLOOR THEREOF AND WITH THE SHOULDER ABUTTING THE FREE END OF THE FLANGE, THE FLANGE BEING CRIMPED INWARDLY INTO TIGHT ENGAGEMENT WITH THE ANNULAR SIDE WALL OF THE RECESS ON THE CAP MEMBER, THE WALL THICKNESS OF THE FLANGE AND THE RADIAL DEPTH OF THE RECESS BEING SUBSTANTIALLY EQUAL, WHEREBY THE EXTERNAL SURFACES OF THE FLANGE AND THE DOME SECTION ARE SUBSTANTIALLY FLUSH, SO THAT WHEN THE ASSEMBLED NUT IS MOUNTED ON A BOLT AND TORQUED HOME, THE THREADS OF THE BOLT WILL BITE INTO THE BODY SECTION OF THE CAP MEMBER, AND THE MATERIAL OF THE CAP MEMBER WILL BE UNDER COMPRESSION IN THE AREA BETWEEN THE BOLT AND THE CRIMPED FLANGE.