A blind tack fastener comprising: a pull stem having an elongated shaft with an extended tail portion, the elongated shaft having a first outer surface with a first outer diameter, the extended tail portion having a second outer surface with a second outer diameter larger than the first outer diameter, the extended tail portion also having a fillet; a crush-initiating washer surrounding the pull stem, the crush-initiating washer having a head-end surface, a fillet engagement surface in contact with the fillet of the extended tail portion of the elongated shaft, an inner surface in contact with the first outer surface of the first portion of the elongated shaft, and an outer surface with an outer diameter substantially equal to the second outer diameter of the extended tail portion of the elongated shaft; a crush sleeve surrounding the pull stem, the crush sleeve having a head-end surface, a tail-end surface in contact with the head-end surface of the crush-initiating washer, an inner surface in contact with the first outer surface of the first portion of the elongated shaft, and an outer surface with an outer diameter substantially equal to the second outer diameter of the extended tail portion of the elongated shaft; a swage collar surrounding the pull stem, the swage collar having a tail-end surface in contact with the head-end surface of the crush sleeve, an inner surface in contact with the first outer surface of the first portion of the elongated shaft, and an outer surface with an outer diameter larger than the second outer diameter of the extended tail portion of the elongated shaft; and a breakaway groove in the elongated shaft of the pull stem, the breakaway groove being arranged to be located within an inner bore of the swage collar when the blind tack fastener is fully installed. a pull stem having an elongated shaft with an extended tail portion, the elongated shaft having a first outer surface with a first outer diameter, the extended tail portion having a second outer surface with a second outer diameter larger than the first outer diameter, the extended tail portion also having a fillet; a crush-initiating washer surrounding the pull stem, the crush-initiating washer having a head-end surface, a fillet engagement surface in contact with the fillet of the extended tail portion of the elongated shaft, an inner surface in contact with the first outer surface of the first portion of the elongated shaft, and an outer surface with an outer diameter substantially equal to the second outer diameter of the extended tail portion of the elongated shaft; a crush sleeve surrounding the pull stem, the crush sleeve having a head-end surface, a tail-end surface in contact with the head-end surface of the crush-initiating washer, an inner surface in contact with the first outer surface of the first portion of the elongated shaft, and an outer surface with an outer diameter substantially equal to the second outer diameter of the extended tail portion of the elongated shaft; a swage collar surrounding the pull stem, the swage collar having a tail-end surface in contact with the head-end surface of the crush sleeve, an inner surface in contact with the first outer surface of the first portion of the elongated shaft, and an outer surface with an outer diameter larger than the second outer diameter of the extended tail portion of the elongated shaft; and a breakaway groove in the elongated shaft of the pull stem, the breakaway groove being arranged to be located within an inner bore of the swage collar when the blind tack fastener is fully installed.