Patent ID: 6179538
Filing Date: 2001-01-30
Classification: E04D,F16B

Abstract:
A screw for fastening metal and/or plastic sections or plates to a substructure through a borehole (14) having a diameter (D2), said screw comprising;a shank with a threaded portion having a core diameter (D1) and an outside diameter (DG), a drive portion for applying a driving device, and a flaring portion (6) adjacent to the drive portion (3) that flares conically toward the drive portion (3),said flaring portion (6) having a diameter (DK) close to the drive portion that is larger than the diameter (D2) of the borehole (14) receiving the screw (1) and is also larger than the core diameter (D1) of the threaded portion (5) of the screw (1), andsaid drive portion (3) further comprising a region (27) having a stripping safeguard (29) adapted to prevent stripping of the threaded portion of the screw within the substructure.