Screw

特許 係属中 PROBLEM TO BE SOLVED: To provide an aluminum-based composite material made screw easily and inexpensively manufacturable with high productivity by plastic deformation processing at room temperature, and its manufacturing method. ; SOLUTION: The aluminum-based composite material made screw 10 has a structure wherein a screw thread part 14 comprised of a composite material comprised by dispersing reinforcement particles in an aluminum-based metal of the same type as a shaft center part 12 is formed continuously with the shaft center part 12 on an outer side of the shaft center part 12 mainly composed of the aluminum-based metal.