High torque fastener

Claim 1

A BOLT WHICH COMPRISES: A CYLINDRICAL SHANK; A HEAD ON SAID SHANK, SAID HEAD HAVING A FLAT-TOPPED SURFACE, AND SAID HEAD HAVING A PAIR OF PARALLEL, SPACED, ARCUATEBOTTOMED RECESSES OPENING TO SAID FLAT-TOPPED SURFACE, SAID RECESSES HAVING FOUR PARALLEL SIDE WALLS ALL OF WHICH ARE PERPENDICULAR TO SAID FLAT-TOPPED SURFACE, THE ENDS OF EACH OF SAID RECESSES BEING DISPOSED INWARDLY A SUBSTANTIAL DISTANCE FROM THE PERIPHERY OF SAID FLAT-TOPPED SURFACE, WHEREBY SAID RECESSES ARE SURROUNDED BY A CONTINUOUS RING OF MATERIAL OF SUBSTANTIAL MASS, SAID RECESSES BEING DISPOSED EQUAL DISTANCES FROM AND ON OPPOSITE SIDES OF THE LONGITUDINAL AXIS OF SAID BOLT SO AS TO DEFINE A CONTINUOUS BRIDGE BETWEEN SAID RECESSES, AND BRIDGE BETWEEN SAID RECESSES BEING INTEGRAL AT ITS ENDS WITH SAID CONTINUOUS RING OF MATERIAL, THE HEAD CONFORMATION AROUND SAID RECESSES COMPRISING A PAIR OF CHORDAL SEGMENTS ON THE SIDES OF THE RECESSES, AND A PAIR OF CHORDAL SEGMENTS LYING AT THE ENDS OF THE RECESSES INTO WHICH SAID BRIDGE EXTENDS, SAID CHORDAL SEGMENTS BEARING END TO END AGAINST EACH OTHER AS A RING OF SEGMENTS AROUND THE HEAD RIM; THE RATIO OF RADIUS OF THE ARC OF THE ARCUATE BOTTOM OF EACH RECESS TO THE LENGTH OF SAID RECESS, MEASURED AT SAID FLATTOPPED SURFACE, BEING GREATER THAN ONE; AND THE BOTTOM OF SAID RECESSES BEING ARCED TRANSVERSELY TO SAID BRIDGE.