Patent ID: 7351020

Claim:
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 mounting seat on said body having a surface positioned to face and engage a mating surface formed in an external structure to be fastened by said fastener; a shroud receiving body portion on said fastener body between said first body end and said mounting seat; 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 between said first body end and said mounting seat; a first shoulder on said shroud receiving portion adapted to retain said shroud against movement toward said first body end; a second shoulder on said shroud receiving portion adapted to retain said shroud against movement toward said second body end; said first and second shoulders facing each other; at least one of said shoulders being a reduced shoulder that is sized to allow said shroud to slide over said reduced shoulder when said shroud is in an undeformed condition; said shroud extending from said first shoulder to said second shoulder and at least one of said shoulders facing an end face of said shroud; a region provided by said reduced shoulder to facilitate deformation of said shroud and retention thereof on said fastener body; and said shroud being deformed at said region so that said shroud is captured by said reduced shoulder to retain said shroud 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.