Hilti Aktiengesellschaft

Johannes Dobler

Michael Werner

Herbert Kaufmann

Romed Staggl

A thread forming screws including opposite flanks connecting the screw crest region with the screw root region and tapering outwardly toward the root region, with each flank being formed of outer and inner flank sections tapering toward the root sections at different angles, and with the crest region being formed of a first region section ( ) extending parallel to a central axis of the screw and a second, inclination region section ( ) inclined toward the root region ( ) in a direction opposite a setting direction (S) at an angle of from about 10&deg; to about 45&deg;.

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Rankweil, Australia

Johannes Dobler