A tool for crimping a cap onto a fastener body , said fastener body comprising a thread , a plurality of wrenching surfaces disposed along a top portion of said fastener body , a first outer flange disposed below said wrenching surfaces and extending outward therefrom, a second outer flange disposed below said first outer flange , and a groove disposed between said first and second outer flanges, and said cap being disposed over said wrenching surfaces and said first outer flange , an end of said cap being crimped around said first outer flange , said end being crimped in said groove between said first and second outer flanges, a bottom portion of said fastener body comprising said second outer flange and said thread remaining uncovered by said cap, said tool comprising: a fastener holder , said fastener holder configured to hold and support said fastener body and said cap , said fastener body being disposed in said cap , and said fastener holder receiving said top portion of said fastener body and said cap ; a crimp head comprising a plurality of crimp segments spaced circumferentially around said fastener holder , said crimp segments comprising an inwardly extending rib extending circumferentially around said crimp segments , said rib configured to move - axially toward said fastener holder over said second outer flange and toward said first outer flange , and said rib configured to simultaneously move radially inward into said groove to crimp said end of said cap into said groove ; and a crimp head body , said crimp head body comprising an internal cavity and a tapered inner surface tapering outwardly toward said fastener holder , said crimp segments comprising a tapered outer surface tapering outwardly toward said fastener holder , said crimp segments received within said internal cavity of said crimp head body and said tapered inner and outer surfaces engaged therewith, said crimp head body configured to move toward said fastener holder relative to said crimp segments , said tapered inner and outer surfaces thereby configured to slide relative to each other and force said crimp segments radially inward. a fastener holder , said fastener holder configured to hold and support said fastener body and said cap , said fastener body being disposed in said cap , and said fastener holder receiving said top portion of said fastener body and said cap ; a crimp head comprising a plurality of crimp segments spaced circumferentially around said fastener holder , said crimp segments comprising an inwardly extending rib extending circumferentially around said crimp segments , said rib configured to move - axially toward said fastener holder over said second outer flange and toward said first outer flange , and said rib configured to simultaneously move radially inward into said groove to crimp said end of said cap into said groove ; and a crimp head body , said crimp head body comprising an internal cavity and a tapered inner surface tapering outwardly toward said fastener holder , said crimp segments comprising a tapered outer surface tapering outwardly toward said fastener holder , said crimp segments received within said internal cavity of said crimp head body and said tapered inner and outer surfaces engaged therewith, said crimp head body configured to move toward said fastener holder relative to said crimp segments , said tapered inner and outer surfaces thereby configured to slide relative to each other and force said crimp segments radially inward. <EOS>