Mounting devices with an externally ribbed anchor, in particular for furniture hinges

An expansion fastener for hardware elements for furniture, comprising an externally ribbed anchor body for insertion in a furniture bore hole, and made of a material which is at least radially flexible, an insert mounted for axial movement in a bore in said body and having thereon a cam surface slidably engaged with a corresponding cam surface in the anchor body and operative to cause radial expansion of said body upon movement of said insert in an axial direction relative to the anchor body from a rest position to an expansion position, and characterized in that said insert comprises a fitting end extending radially of the anchor body axis in a region free from the anchor body, the insert being susceptible of inclination in the extension direction of said fitting end, and upon axial movement thereof towards said expansion position the insert having the cam surface thereof sliding on the cam surface on said anchor body thereby to move said fitting end outwardly to anchor the insert and draw the anchor body into the furniture bore hole.