Also known as collar nuts, these metric nuts have a flange that distributes pressure across the surface, so you don't need a washer. Because of the flange, they may not fit in tight spaces. Made of high-strength Class 10 steel, they’re about 25% stronger than medium-strength steel flange nuts. Their strength is comparable to Class 10.9 bolts.

When choosing your finish, consider your environment. Steel nuts without any finish should be used in dry environments. Nuts with a black-oxide finish have mild corrosion resistance, but only in dry environments. Zinc-plated nuts have a layer of zinc that protects the steel under it from rust, extending the life of the nut. A black-phosphate finish shields nuts from rusting, even in the midst of oil and grease.

ISO 4161 (formerly DIN 6923) and DIN 6331 nuts meet international standards for flange nut dimensions and materials.

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A nylon insert firmly grips threads to resist loosening and a flange distributes the load over a large area. They’re reusable, but their holding power lessens with each use. Made from Class 10 steel, they're about 25% stronger than medium-strength steel flange nuts and comparable in strength to Class 10.9 bolts. They have a zinc-yellow chromate plating to resist corrosion in wet environments. Height includes the flange.

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Grip metric bolts more securely than nylon-insert flange locknuts—the irregularly shaped threads on these locknuts hold extra tight. They resist vibration and sudden shocks, even after multiple uses. Thanks to their flange, these nuts distribute pressure across a greater area than standard nuts, so you don’t need to add a washer. However, they may not fit in tight spaces. Made of high-strength, Class 10 steel, these nuts are about 25% stronger than medium-strength steel flange nuts. Their strength is comparable to Class 10.9 bolts. A zinc plating protects the steel under it from rust, extending the life of the nut.

These flange nuts meet DIN and ISO dimensional standards that confirm their compatibility with other parts and tools. ISO 7044 is functionally equivalent to DIN 1664 (formerly DIN 6927).

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

A nylon insert keeps metric bolt threads from coming loose due to vibration, wear, and temperature swings. About 25% stronger than medium-strength steel locknuts, these nuts are made of high-strength, Class 10 steel. They're used in valves, pumps, suspension systems, and other high-stress parts. A zinc plating prevents rust in wet areas. Combine with Class 10.9 metric bolts, which have similar strength. All are reusable but lose holding power after each use.

These locknuts meet ISO 7040 and ISO 7041-2 (formerly DIN 985 and DIN 982), which are international standards for dimensions. The ISO standards are functionally equivalent to the DIN standards with slight differences in width, height, or tolerances.

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