To provide a stud pin keeping the beauty of a product, and capable of being inexpensively mass-produced.
In the stud pin, a thread is formed on a shaft 2, and a serration 10 pressed and fixed in a work 20 is formed on a head having a diameter larger than the shaft 2. An arc-shaped surface 11 is formed on the end surface outer peripheral side of the serration 10 formed on the head 3 so as to gradually decrease the thickness of a peripheral side, and a flat surface continuing to the arc-shaped surface is formed on the center side of the head 3. A neck 5 having a diameter smaller than the shaft 2 is formed between the head 3 and the shaft 2. The stud pin is thereby securely and integrally fixed to the work without rotating and slipping off. On the back surface of the metal plate work fixed with the stud pin, the head hardly projects out at the installing position of the stud pin, so that, for example, when a film is adhered to the back surface, the film is prevented from being hooked to a corner and damaged, and the beauty thereof is improved.
OTA NAOKI
MATSUO YASUSHI
