How are screws, specifically their heads, manufactured? The shapes of screws are often quite complex depending on the type and head. Is the head just stamped into the screw?
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This video shows two machines making screws:
[https://www.youtube.com/watch?v=C4a4IZnE98k](https://www.youtube.com/watch?v=C4a4IZnE98k)
It’s not easy to see what is happening inside the machine, but at the start of the video they show how the head is formed in two steps.
In their arrangement, after the head is finished, the threads are rolled on by a second machine.
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