Patent ID: 7955036

Claim:
A threaded assembly comprising a screw ( 30 ) and a work piece ( 42 ), with the screw ( 30 ) having a shaft ( 30 ) provided with a thread ( 36 ) and at a free end, facing away from the head ( 34 ) having a hole-forming or hole boring tip ( 38 ) and an unthreaded shaft section ( 40 ) at its end adjacent to the head ( 34 ) and with the work piece ( 42 ) comprising at least one thin plate ( 42 a , 42 b ), a washer ( 14 ) is arranged between the head ( 34 ) of the screw ( 30 ) and the work piece ( 42 ), with the washer ( 14 ) being provided with a bore ( 12 ) for accepting the screw ( 30 ) and which is spatially deformed around an axis ( 16 ) extending diametrically through the bore ( 12 ), the washer ( 14 ) is bent around the diametric axis ( 16 ) such that an angular crown line ( 18 ) is parallel in reference to the axis ( 16 ) and the washer ( 14 ) is angled and has an operational thickness (D e ) greater than an initial thickness (D a ) of the washer ( 14 ), and the washer ( 14 ) comprises a material selected such that the washer ( 14 ) is plastically deformed during installation, and a length (L g ) of the unthreaded shaft section ( 40 ) is smaller than a sum of a thickness (D w ) of the work piece ( 42 ) and the operational thickness (D e ) of the washer ( 14 ) and is essentially not smaller than the sum of the thickness (D w ) of the work piece ( 42 ) and the initial thickness (D a ) of the washer ( 14 ) so that play is compensated as an uppermost winding of the thread exits a bottom of a threaded bore formed by the screw in a bottom-most one of the at least one thin plate.