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Nuts have internal machine threads, for use with machine thread bolts and screws.

Nuts, Stainless steel, #4-40

Hex machine screw nut

Hex machine screw nuts

A hex nut in smaller sizes for machine screw diameters under 1/4".

Hex nylon insert lock nuts

Hex nylon insert lock nuts

A hex nut with a nylon ring to resist loosening.

Hex jam nylon insert lock nuts

Hex jam nylon insert lock nuts

A thinner version of a nylon insert lock nut.

K-Lock nut

K-Lock nuts

A nut with an attached free-spinning external tooth lock washer.

Square nut

Square nuts

A four sided nut.