A fastener comprising: a fastener body (16,16e) orientated about a central axis (x-x); said fastener body having a tool-engaging portion to which a driving torque may be applied and a threaded fastening portion configured and arranged to mate with a corresponding threaded element; said fastener body having a shroud-receiving body portion (19,19e) orientated about said central axis; a shroud (20, 20e) concentrically mounted on said shroud-receiving body portion (19, 19e); an intermediate sleeve disposed concentrically between said shroud-receiving body portion (19, 19e) and said shroud (20,20e); said shroud (20,20e) having an inner surface (46,46e) facing an opposed outer surface of said intermediate sleeve along an axially overlapping portion of said shroud and said intermediate sleeve; said intermediate sleeve having an inner surface facing an opposed outer surface (25, 25e) of said shroud-receiving body portion along an axially overlapping portion of said intermediate sleeve and said shroud-receiving body portion; said shroud being supported in rotatable relationship with said shroud-receiving body portion such that said shroud will rotate relative to said fastener body under an applied external torque prior to said fastener body rotating when said fastener is engaged with an external structure at a design installation torque; a first shroud-retaining element restraining said shroud from movement in at least a first axial direction along said central axis relative to said fastener body; a second shroud-retaining element restraining said shroud from movement in at least a second axial direction along said central axis opposite to said first axial direction along said central axis relative to said fastener body; and wherein said outer surface of said intermediate sleeve has a coefficient of friction less than said outer surface of said shroud-receiving body portion, and/or said inner surface of said intermediate sleeve has a coefficient of friction less than said outer surface of said shroud-receiving body portion, and/or said outer surface of said intermediate sleeve has coefficient of friction less than said inner surface of said shroud. a fastener body (16,16e) orientated about a central axis (x-x); said fastener body having a tool-engaging portion to which a driving torque may be applied and a threaded fastening portion configured and arranged to mate with a corresponding threaded element; said fastener body having a shroud-receiving body portion (19,19e) orientated about said central axis; a shroud (20, 20e) concentrically mounted on said shroud-receiving body portion (19, 19e); an intermediate sleeve disposed concentrically between said shroud-receiving body portion (19, 19e) and said shroud (20,20e); said shroud (20,20e) having an inner surface (46,46e) facing an opposed outer surface of said intermediate sleeve along an axially overlapping portion of said shroud and said intermediate sleeve; said intermediate sleeve having an inner surface facing an opposed outer surface (25, 25e) of said shroud-receiving body portion along an axially overlapping portion of said intermediate sleeve and said shroud-receiving body portion; said shroud being supported in rotatable relationship with said shroud-receiving body portion such that said shroud will rotate relative to said fastener body under an applied external torque prior to said fastener body rotating when said fastener is engaged with an external structure at a design installation torque; a first shroud-retaining element restraining said shroud from movement in at least a first axial direction along said central axis relative to said fastener body; a second shroud-retaining element restraining said shroud from movement in at least a second axial direction along said central axis opposite to said first axial direction along said central axis relative to said fastener body; and wherein said outer surface of said intermediate sleeve has a coefficient of friction less than said outer surface of said shroud-receiving body portion, and/or said inner surface of said intermediate sleeve has a coefficient of friction less than said outer surface of said shroud-receiving body portion, and/or said outer surface of said intermediate sleeve has coefficient of friction less than said inner surface of said shroud.