Acorn nuts cover exposed ends and add a finished look.
Castle nuts can be used with cotter pins to prevent loosening.
Coupling nuts are designed to join two externally threaded objects.
Flange nuts have a large circular base that distributes pressure.
Hex nuts have an internal thread and are available in several sizes.
Jam nuts can be used where standard nuts will not fit.
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Lock nuts will not loosen from vibrations or torque.
Machine nuts can be used to fasten mechanical materials together.
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Slotted nuts are used with cotter pins on drilled shank fasteners.
Spring nuts are self-locking nuts that prevent loosening from vibrations.
Square nuts are internally threaded and have a large bearing surface.
Tee nuts can be used to fasten wood, particle board and plastic.