Made from medium-strength steel with a nylon insert, these Class 8 metric locknuts are strong enough to use on most machinery and equipment that’s prone to vibration and temperature changes. The nylon insert also won’t damage the threads on your bolt. All are reusable, but their holding power lessens with each use. Pair them with compatible Class 8.8 metric bolts.

Most of these locknuts meet ISO 7040 or ISO 10511 (formerly DIN 982 or DIN 985), which are international standards for dimensions. The ISO standards are functionally equivalent to the DIN standards with slight differences in width, height, or tolerances.

Zinc- and zinc yellow-chromate plated steel locknuts are a good option in dry environments. The zinc plating prevents the steel from corroding until the plating wears away.

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These locknuts have good chemical resistance and may be mildly magnetic. They have an irregularly shaped thread at the top of the nut that grips the bolt for a stronger hold than nylon-insert locknuts. These locknuts thread on from the bottom of the nut, allowing more threads to engage the bolt before tightening for easier installation than center-lock distorted thread locknuts. The strength of the bolt should match the strength of the nut to prevent damaging threads. They're not reusable.

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Strong enough for use with most machinery and equipment, these Class 8 metric locknuts have an irregularly shaped thread in the middle of the nut that grips bolts tighter than nylon-insert locknuts. Also known as reversible locknuts, they can be threaded on from either end. All are zinc-plated steel, so they won’t rust in wet and damp areas.

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With more points of contact than a hex, these flange nuts allow you to get a better grip for more driver torque. The flange distributes pressure where the nut meets the material surface, eliminating the need for a separate washer. They have a black-oxide finish for mild corrosion resistance in dry environments. Height includes the flange.

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These flange nuts have excellent resistance to chemicals and salt water. With more points of contact than a hex, they allow you to get a better grip for more driver torque. The flange distributes pressure where the nut meets the material surface, eliminating the need for a separate washer. Height includes the flange.

For technical drawings and 3-D models, click on a part number.

These nuts have wings that provide more leverage for greater torque while tightening than knurled-head thumb nuts.

Zinc-plated wing nuts are corrosion resistant in wet environments.

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