Class 8 nuts are comparable in strength to Class 8.8 bolts and are suitable for fastening most machinery and equipment.

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These nuts are half the height of standard hex nuts, and have closely spaced threads to prevent loosening from vibration. They are not compatible with coarse threads. Use them to fasten most machinery and equipment.

Also known as jam nuts, they can be used in place of standard nuts when height clearances are tight, or threaded together to form a locknut. When fastening threaded rod, you can use two nuts to create a point for tightening the rod into place with a wrench. These nuts have less tensile strength than a standard hex nut when used alone.

All meet ISO or DIN standards for dimensions and material composition to ensure compatibility with other products and tools. DIN 936 and DIN 439B standards are no longer active, but they are commonly referenced globally.

Steel nuts without a plating are best for dry environments, since exposure to moisture and chemicals will cause them to rust.

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Half as thick as regular hex nuts, these metric nuts fit into spaces with low height clearances. They’re a good choice for fastening most machinery and equipment. Also known as jam nuts, they can be threaded together to form a locknut that won’t move or loosen due to vibration. When fastening threaded rod, you can use two nuts to create a point for tightening the rod with a wrench. These nuts have less tensile strength than a standard hex nut when used alone. Made of steel, they’re best for dry environments, since moisture and chemicals will cause them to rust.

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About 10% wider and taller than standard hex nuts, these metric-sized heavy hex nuts distribute the load over a large area. Grade 2H nuts are comparable in strength to Class 12.9 bolts. They're about 20% stronger than high-strength steel nuts and are used in heavy machinery, such as earth-moving equipment.

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With a nylon insert that grips your threaded shaft or spindle without damaging its threads, these locknuts—also called shaft nuts—hold bearings, bushings, gears, and pulleys prone to vibration tightly in place. They come as one piece, so you can easily clamp them onto your shaft or spindle. But, since they aren’t made entirely of metal, they don’t stand up to heat as well as all-metal locknuts. Slots in their sides mean you can tighten and loosen them with a spanner wrench or spanner socket. Their face is also chamfered to help keep the size and weight of your assembly at a minimum. All meet international standards for bearing locknut dimensions.

When choosing your thread spacing, consider the precision of your application. The finer the threads, the more control you have when making adjustments.

All carbon steel locknuts are strong and resist wear, though they don’t stand up to corrosion as well as stainless steel locknuts. Zinc-plated steel locknuts resist rusting from some moisture, but you shouldn’t use them with salt water or chemicals.

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