Patent Number: 6,254,326

Title: Screw having a tapered thread

Abstract: In a screw (1) for mutual fastening of two components (2 and 3) there is provided a shank (4) with a thread (6), an unthreaded shank portion (7) and a screw head (5). The end region (8) of the thread (6) adjacent to the unthreaded shank portion (7) tapers with constant thread pitch (S), and so the tapering end region (8) of the thread (6) forms a kind of frustoconical envelope surface (10) upon rotation of the screw (1). During setting of the screw (1) and during over-torquing thereof, the end region (8) of the thread (6) acts as a kind of milling cutter and makes a frustoconical opening (13) in the component (3). The thread flights in the tapering end region (8) can then be braced against the wall of this opening (13), so that mutual contact pressure between the components (2 and 3) is possible despite over-torquing of the screw (1).

Inventors: Palm; Erich (Au, CH)

Assignee: SFS Industrie Holding AG

International Classification: F16B 25/00 (20060101); F16B 035/04 ()

Expiration Date: 07/03/2018