3/8-16 Acorn Cap Nuts, Stainless Steel 18-8, Standard Height, Plain Finish, Quantity 25

Fastenere
Acorn nut is its common name and it is also called a crown hex nut, blind nut, cap nut or domed cap nut. It is a nut that has a domed top to cover the threads.
This is to prevent contact with the external thread to protect the threads or protect other things the threads would rub against.
In addition the dome gives a more finished appearance.nuts and bolts
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