It depends on what you mean by “incredibly small” and “hardware”.
If by “hardware” you mean things you might find at a hardware store, then small parts are often made from sheet metal. If this is the kind of “hardware” you are asking about, here are a couple of videos that show how small complicated parts can be made from sheet metal.
This first video does a god job of showing the overall process. I’d call it a small part, but not incredibly small:
This next video shows a smaller part, but it doesn’t show the process. It’s still probably not incredibly small, so maybe this isn’t the kind of “hardware” you are asking about.
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