Sfs-intec Holding Ag

Marco Zach

Rene Dutler

Roland Mair

Peter Schmid

Ralf Steyer

A method of producing fastening assembly () including a series of layers () and a screw (), the screw () having a screw head (), a shaft (), a thread () extending into a displacement tip () and an unthreaded shaft portion (). The method includes screwing the screw () into the series of layers (), the layer () in the series of layers () that is furthest from the screw head () being deformed in the screw-in direction, so that a thickness Dof the series of layers () is increased in a region around the screw (), and continuing to screw in the screw () until the screw head () strikes the series of layers, a maximum thickness Dof the series of layers being reached at this moment and the length Lof the unthreaded shaft portion () being up to 10% less than and up to 30% greater than the maximum thickness Dof the series of layers.

Method for producing a securing arrangement and securing arrangement

A self-drilling screw composed of an austenitic or some other non-corrosive base material () is provided, having a shank (), having a cutting or shaping drilling or threaded tip () arranged at one shank end and having a hard coating () applied at least to the drilling or threaded tip () by electrodeposition, this hard coating () having a layer containing a transition metal, for example a hard chromium layer. The shank () has a hard edge layer () at least under the hard coating (). A topcoat () composed of a lubricating and heat-dissipating material, which preferably is metal, wax and/or lacquer, is applied to the hard coating ().

Drilling screw

A self-drilling screw made of an austenitic or other stainless steel, is provided having a drilling tip. The shank is integrally formed of an austenitic or other stainless steel and has a galvanically applied thin coating at least in the tip region, with the coating being harder than a non-coated region. The thin coating has a pearl-like or columnar surface, a coating thickness of at least 2 &#x3bc;m and a hardness in a range of from 500 to 1500 HV0.3. The self-drilling screw can be produced more simply than a typical self-drilling screw, in which the drilling tip consists of a harder material than the shank and is welded to the shank made of stainless steel. The coating ensures the drilling capacity and thread formation.

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Diepoldsau, Switzerland

Marco Zach