If you've always wondered how nuts and bolts were manufactured, then check out this interesting "How it's Made" segment. Video after the break.
Screws and bolts are made in a wide range of materials, with steel being perhaps the most common, in many varieties. Where great resistance to weather or corrosion is required, stainless steel, titanium, brass or bronze may be used, or a coating such as brass, zinc or chromium applied
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[Source: Tech Blog]
