Nuts have internal machine threads, for use with machine thread bolts and screws.
A hex nut in smaller sizes for machine screw diameters under 1/4.
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A hex nut with a nylon ring to resist loosening.
A long nut used to connect pieces of threaded rod or other male threaded fasteners.
A nut with a finished top that covers the end of the bolt. Bolts must be in the proper length.