A track fastener assembly for securing a seat or cargo apparatus to a floor track of a vehicle. The assembly includes a bottom rail with forward and aft ends. Front and rear movable slides carrying locking studs are carried by the bottom rail. A locking rod having a helical groove formed in its outer surface is operatively connected to the bottom rail and the slides. Rotation of the locking rod causes the slides to move axially from an installation position to a locking position. As the slides move to the locking position, they are deflected upwards along with the attached locking studs, clamping the track fastener assembly to the track.