Fastening element with guide member

Claim 1

A fastening element to be driven into hard receiving material such as metals comprising an axially elongated member having a leading end to be inserted first into the receiving material and a trailing end, said member having a head at the trailing end thereof including means for engagement with a device for rotationally driving said member, an axially elongated shank extending from the leading end to adjacent the trailing end, said shank having a tip at the leading end, a guide member mounted on said shank between the leading and trailing ends, said shank being threaded along at least an axially extending section from adjacent the trailing end toward the leading end, wherein the improvement comprises that said guide member has a cup-like shape with an opening formed by the cup-like shape facing toward the leading end of said member, said guide member comprising a base in threaded engagement with and encircling said shank and having a radially outer edge, said base being axially spaced at a distance A from the trailing end of said member when said fastening element is arranged to be driven into a receiving material, and a radially outer annular section projecting radially outwardly from said annular edge of said base and axially toward the leading end from said base, said annular section having an end surface extending transversely of the axial direction and facing toward the leading end with said end surface spaced axially from said base toward the leading end.