Patent ID: 7445414
Filing Date: 2008-11-04
Classification: F16B,Y10S

Abstract:
1. A high security fastener, comprising: a fastener body; a first body end on said fastener body; a key-receiving pattern at said first body end; a second body end on said fastener body; a thread pattern extending from said second body end; a shroud-receiving body portion on said fastener body extending from said first body end toward said second body ends; an annular shroud-retaining shoulder defining an end of said shroud-receiving body portion that is remote from said first body end, said shroud-retaining shoulder facing toward said first body end; a shroud concentrically mounted on said shroud-receiving portion, said shroud having a first shroud end terminating substantially at said first body end and a second shroud end terminating substantially at said shroud-retaining shoulder, said shroud having a thickened wall portion proximate to said first body end adapted to resist insertion of an unauthorized tool between said shroud and said body; an annular end face at said shroud second end in opposing relationship with said annular shroud-retaining shoulder such that said shroud is restrained in a direction of movement toward said second body end; an annular clearance groove in said shroud-receiving portion at said shroud second end; a retainer retaining said shroud on said shroud-receiving portion, said retainer being disposed in opposing annular retainer grooves respectively formed in said shroud and said shroud-receiving portion at a location that is spaced from said first body end such that said shroud is restrained in a direction of movement toward said first body end; and said shroud being supported in rotatable relationship with said shroud-receiving portion such that said shroud will rotate relative to said fastener body under an applied external torque prior to said fastener rotating when said fastener is engaged with an external structure at a design installation torque.