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.

Extra-Wide Thin Hex Nuts

Also known as heavy jam nuts, these are about half the height and 10% wider than standard hex nuts. Use them in low-clearance applications or jam one against another extra-wide hex nut to hold it in place.

Locknuts

Nylon-Insert Locknuts

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

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

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.

Square Nuts

Large flat sides make these nuts easy to grip with a wrench and keep them from rotating in channels and square holes.

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Hex Nuts