McMaster-Carr

Also known as jam nuts, these are about half the height of standard hex nuts. Use them in low-clearance applications or jam one against another nut to hold it in place.

Extra-Wide Hex Nuts

Often referred to as heavy hex nuts, these are about 10% wider and taller than standard hex nuts. They distribute the load over a large area.

High Hex Nuts

With a height that is 50% taller than standard hex nuts, high hex nuts provide a larger gripping area for installation with a wrench.

Locknuts

Nylon-Insert Locknuts

These locknuts have a nylon insert that grips threads to resist loosening.

Locknuts for use with Cotter Pins

Also known as castle nuts, secure these nuts by inserting a cotter pin or safety wire through the slots in the nut and a drilled hole in your bolt for light duty locking applications.

Flex-Top Locknuts
for Heavy Vibration

The threads at the top of these locknuts expand to grip the bolt on all sides for a stronger hold than distorted-thread locknuts.

Distorted-Thread Locknuts

An irregularly shaped thread grips the bolt for a stronger hold than nylon-insert locknuts.

Steel-Insert Locknuts
for Extreme Vibration

When installed, the steel insert grips the threads and lifts away from the nut body, isolating the insert from the nut’s load to resist spinoff caused by vibration. They're often used in shakers and vibrating equipment.

Other Nuts

Flange Nuts

The flange distributes pressure where the nut meets the material surface, eliminating the need for a separate washer.

Coupling Nuts

Also known as extension nuts, use these to connect and extend threaded rods. They’re about three times taller than standard hex nuts.

Cap Nuts

Cover and protect threads while providing a finished appearance.

Socket Nuts

Also known as Allen nuts, use these nuts with socket head cap screws in recessed holes and tight spaces that don't have enough clearance for a wrench.

Tube-End Nuts

Connect threaded parts to steel tubes.

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Hex Nuts