If you want to design screws, how to find a screw manufacturer?

If you want to design screws, how to find a screw manufacturer?: Generally, in the process of developing new products, it is necessary to customize the design screws to assemble. After designing the screws

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stainless flat head screws, surface a variety of color can do it?

What effect does washer head screws have?

Die Spotting Extra Long screw