Patent ID: 8714863

Claim:
A fastening element for use with a tightening element to form a device for joining together first and second members, the fastening element consisting of: a first part consisting of steel and a second part consisting of zinc formed into a one-piece element by means for connecting the first and second, separate parts to prevent any relative movement there between, the first part comprising head and shank portions; and the second part comprising a fixing portion and a flange; the fixing portion being located at one end of the fastening element for attaching the fastening element to the first member, the head portion being located at the other end thereof for engaging said tightening element in use mounted in the second member, and the shank portion extending between the fixing portion and the head portion; the fastening element having an axis extending between the one end and the other end, with the flange being intermediate the head and the fixing portion and including an annular surface extending perpendicular to the axis having a diametric extent greater than a diametric extent of the fixing portion and limiting depth of penetration of the fixing portion into said first member.