PURPOSE: To provide an expansible fastening device for connecting and fastening one or multiple component parts to a base member.

CONSTITUTION: An expansible fastening device 10 for placement in a hole preformed in a base member and fastening component part to the base member using a normal nut 24 and a bolt 36. The device includes a fastener body 12 having two body sections 28a and 28b. The body sections form a central cavity 30 that encloses and retains the nut and a wedge 14. The longitudinal body section includes a fin 16 that extends longitudinally and projects radially outward from the central region of each body sections. Furthermore, the body sections include primary and secondary teeth 18 and 20 extending circumferentially about the outer surface of each body sections. In operation, the bolt is engaged with the nut and rotated to push the wedge from the fastening device. As the wedge is driven away from the nut, the teeth and the fin are driven into the base member.