A method of manufacturing a screw having a predetermined thread geometry and a screw tip, comprising the steps of: providing a screw blank having a first diameter, the screw blank having a first end corresponding to the leading end of the screw to be manufactured from the screw blank and a second end corresponding to the trailing end of the screw to be manufactured from the screw blank; reducing the first diameter to a second diameter in a first portion adjacent to the first end of the screw blank; processing the blank in said first portion by rolling with flat dies to form a thread in the first portion and said tip as a threaded tip at the first end; and processing the blank in a second portion adjoining the first portion by rolling in an axial continuous process to form a thread in the second portion which continuously continues the thread in the first portion, wherein the first and second diameters of the screw blank are each selected such that during processing in steps C and D a uniform or at least approximately uniform thread having the predetermined thread geometry is formed which extends over the first and second portions.

The present invention provides an aluminum alloy screw that uses 6000 series aluminum suitable for recycling, that has sufficient mechanical properties, and that can be used for fastening, with respect to automobile parts or the like, which is subjected to loads and is required to be highly reliable. Also provided are: a simple and efficient method for producing this aluminum alloy screw; and an aluminum allow screw material that can be suitably used in said production. The aluminum alloy screw is characterized by containing 0.9-1.3 wt % Si, 0.8-1.5 wt % Cu, 0.8-1.2 wt % Mg, 0.2-0.4 wt % Cr, 0.15-0.45 wt % Mn, 0.005-0.05 wt % Ti, with the remainder including Al and unavoidable impurities, where the tensile properties of the screw shaft section is such that the tensile strength is 460 MPa or more, the 0.2% yield strength is 380 MPa or more, and the breaking elongation is 10% or more.

The present invention provides an aluminum alloy screw that uses 6000 series aluminum suitable for recycling, that has sufficient mechanical properties, and that can be used for fastening, with respect to automobile parts or the like, which is subjected to loads and is required to be highly reliable. Also provided are: a simple and efficient method for producing this aluminum alloy screw; and an aluminum allow screw material that can be suitably used in said production. The aluminum alloy screw is characterized by containing 0.9-1.3 wt % Si, 0.8-1.5 wt % Cu, 0.8-1.2 wt % Mg, 0.2-0.4 wt % Cr, 0.15-0.45 wt % Mn, 0.005-0.05 wt % Ti, with the remainder including Al and unavoidable impurities, where the tensile properties of the screw shaft section is such that the tensile strength is 460 MPa or more, the 0.2% yield strength is 380 MPa or more, and the breaking elongation is 10% or more.