A panel fastener, comprising: a) a screw), comprising: a) an enlarged head with means for applying a rotational force thereto; b) a shank extending transverse from said head comprising: i) a neck with an outer diameter; ii) a collar extending axially from said neck and having a diameter greater than said neck; and iii) a flange fixed to and extending radially outwardly from a base portion of said collar, said flange having a diameter greater than the diameter of the collar; and iv) a threaded portion extending axially from the flange to a distal end of the screw; wherein the neck diameter is not greater than a diameter of any other portion of the shank; b) a ferrule surrounding a portion of the screw and having internal captivation means for preventing removal of the screw from the ferrule, said screw being slidable within the ferrule between retracted and extended positions; and, c) a spring operatively positioned between the screw head and the ferrule for biasing the screw toward the retracted position; wherein the screw collar lies axially adjacent the ferrule captivation means when the screw is in the retracted position but not when the screw is in the extended position thereby allowing the screw to move farther radially when the screw is in the extended position compared to when the screw is in the retracted position. a) a screw), comprising: a) an enlarged head with means for applying a rotational force thereto; b) a shank extending transverse from said head comprising: i) a neck with an outer diameter; ii) a collar extending axially from said neck and having a diameter greater than said neck; and iii) a flange fixed to and extending radially outwardly from a base portion of said collar, said flange having a diameter greater than the diameter of the collar; and iv) a threaded portion extending axially from the flange to a distal end of the screw; wherein the neck diameter is not greater than a diameter of any other portion of the shank; a) an enlarged head with means for applying a rotational force thereto; b) a shank extending transverse from said head comprising: i) a neck with an outer diameter; ii) a collar extending axially from said neck and having a diameter greater than said neck; and iii) a flange fixed to and extending radially outwardly from a base portion of said collar, said flange having a diameter greater than the diameter of the collar; and iv) a threaded portion extending axially from the flange to a distal end of the screw; wherein the neck diameter is not greater than a diameter of any other portion of the shank; i) a neck with an outer diameter; ii) a collar extending axially from said neck and having a diameter greater than said neck; and iii) a flange fixed to and extending radially outwardly from a base portion of said collar, said flange having a diameter greater than the diameter of the collar; and iv) a threaded portion extending axially from the flange to a distal end of the screw; b) a ferrule surrounding a portion of the screw and having internal captivation means for preventing removal of the screw from the ferrule, said screw being slidable within the ferrule between retracted and extended positions; and, c) a spring operatively positioned between the screw head and the ferrule for biasing the screw toward the retracted position;