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

Metric nuts

Metric flange nuts

Flange nuts

A nut with a built in washer.

Metric flange nuts serrated

Flange nuts serrated

A nut with a built in washer which is serrated to resist loosening.

Flange nuts, prevailing torque

Flange nuts, prevailing torque

An all metal lock nut with a built in washer often used in high temperature applications. This style of lock nut deforms the threads of the mated fastener. Can be domed or flat style.