Patent ID: 8454288

Claim:
A polygonal nut or bolt, adapted to be engaged with a polygonal socket, comprising a plurality of polygonal sides circumferentially formed on a head portion of the polygonal nut or bolt; at least one said polygonal side of said nut or bolt including: two inclined sub-sides respectively inclined outwardly convergently from opposite apexes of said polygonal side, and each said inclined sub-side extrapolatively defining a small biasing acute angle between each said inclined sub-side and a corresponding socket side of the socket having said socket side juxtapositioned to said polygonal side of the nut or bolt; and an intermediate sub-side transversely intersected with the two inclined sub-sides at two inscribed corners each said inscribed corner formed on an outer end of each said inclined sub-side and separating from each corresponding socket side of the socket with an aperture, whereby upon a rotation of said socket, one said inclined sub-side of said nut or bolt will be planarly coincided with one said socket side of said socket for fastening or unfastening said nut or bolt by said socket.