| 摘要 |
A method of manufacturing an improved screw washer, an improved screw washer, and an improved mold for fabricating the improved screw washer. Using a selected metal plate having a thickness thinner than a nominal height demanded for a nut, the invention primarily aims to form an improved screw washer incorporating a nut satisfying the demanded height. The invention is to provide an improved method of manufacturing an improved screw washer, the improved screw washer, and an improved mold for fabricating the screw washer. Particularly, using this improved mold, the improved screw washer can easily be manufactured, where the above-identified nut is solidly bonded with the metal plate without being disengaged therefrom, and yet, a sufficiently lengthy tapped hole is formed. Structurally, a nut is formed in the state being continuous to a metal plate after punching out part of the metal plate. The nut is further punched in order that a punched hole having a diameter narrower than an inner diameter of a tapped hole can be formed in the center of the nut, and finally, the tapped hole is formed in the nut in the manner being coaxial with the punched hole.
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