Abstract: A fastener cage for retaining a fastener on a panel comprises a retainer and a collar which sandwich a rigid substrate of the panel and snap-fit together in interconnecting relationship through a hole in the substrate. The retainer retains an anchoring end of the fastener and the collar and the retainer transmit pushing and pulling forces on the panel substrate through extensive areas of the respective inner and outer side of the substrate surrounding the hole. The retainer and collar are formed with a central opening for the insertion of the fastener and a thin inexpensive cover is adhered to the retainer to close the opening therein to prevent the entry of plastic foam that is formed against the inner side of the panel substrate.