A power distribution unit includes a fuse, a relay, a busbar, and a heat dissipation bolt. The fuse and the relay each have one terminal. The busbar is located between the fuse and the relay and connects to the two terminals. The heat dissipation bolt connects the busbar to a housing of the power distribution unit and includes two threaded bolts, one going through the busbar and the other going through the housing.

A power distribution unit includes a fuse, a relay, a busbar, and a heat dissipation bolt. The fuse and the relay each have one terminal. The busbar is located between the fuse and the relay and connects to the two terminals. The heat dissipation bolt connects the busbar to a housing of the power distribution unit and includes two threaded bolts, one going through the busbar and the other going through the housing.

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.

The present invention relates to a fastening tool. The fastening tool of the present invention includes: a male screw-side member having a screw portion the screw portion being formed by alternately arranging, in an outer peripheral direction, male screw surfaces where male screw-side screw threads are formed and outer peripheral pieces where the male screw-side screw threads are not formed; and a female screw-side member having a screw hole, the screw hole being formed by alternately arranging, in an inner peripheral direction, female screw surfaces where female screw-side screw threads are formed and inner peripheral pieces where the female screw-side screw threads are not formed, the screw hole allowing the male screw surfaces and the female screw surfaces to be threadedly engaged with each other.