How Its Made, Nuts and Bolts

The wire rod spends 30 hours in the furnace to become more pliable? Seriously?

And I have to mention that the chemistry teacher in me dies just a little when the narrator says phosphate is a chemical compound. It's a part of a chemical compound, sure, but it's not the full compound any more than the stuff you pour on a cut is really just peroxide rather than hydrogen peroxide.

The cold forging of the head of the bolt is amazing, and I wish we could see the forging as it happens. It's amazing to think of the head being forged that drastically in only three stamps.

So, nuts get hot forged while bolts get cold forged? I wonder why the difference.