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What is the history evolution of nut?
Your local hardware store will have them.
Bring an undamaged nut to the local auto parts store, hardware store, or auto repair shop.
Go to a hardware store and buy a nut with that thread and try it.
If it assembled into a tapped hole, it is a screw. It is tightened (torqued) at the head.
If it used witha nut, it is a bolt. It is tightened (torqued) at the nut.
Otherwise, it is the same piece of hardware, only the use is different