These nuts have good chemical resistance and may be mildly magnetic. Metric 18-8 stainless steel is also known as A2 stainless steel.

Black-oxide stainless steel nuts have a dark surface color.

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These nuts have excellent chemical resistance and can be used in saltwater environments. They may be mildly magnetic. They're also known as A4 stainless steel.

Black-oxide stainless steel nuts have a dark surface color.

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Half as thick as regular hex nuts, these nuts fit into spaces with low height clearances. They are about half as strong as medium-strength steel, and are often used for light duty applications, such as securing access panels. 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.

DIN 936 nuts are sometimes taller and wider than ISO 4035 nuts. Although it’s no longer active, DIN 936 is still a commonly referenced standard for material and dimensional compatibility.

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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. Half as strong as medium-strength steel nuts, they are often used for light-duty applications, such as fastening signs in place.

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.

Steel nuts are best for dry environments, since exposure to moisture and chemicals will cause them to rust.

Nuts that meet DIN 936 adhere to international standards for dimensions and material composition to ensure compatibility with other products and tools. Although the DIN 936 standards are no longer active, they are commonly referenced globally.

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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. About half the strength of medium-strength steel thin nuts, use them for light duty fastening applications, such as securing access panels. Some of these screws meet ISO and DIN dimensional standards.

Nuts with fine and extra-fine thread spacing are less likely to loosen from vibration than nuts with coarse thread spacing.

Zinc-plated and zinc yellow-chromate plated steel nuts resist corrosion in wet environments.

Nuts that meet ISO 4035 (formerly DIN 439B) adhere to international standards for dimensions and material composition to ensure compatibility with other products and tools. Although the DIN 439B standards are no longer active, they are commonly referenced globally.

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Useful in low-clearance applications, these metric nuts are roughly half the height of standard hex nuts, but aren’t as strong. Commonly used as locknuts, threading a thin nut against any other hex nut prevents loosening caused by vibration. You can also use them as jam nuts by threading two of these thin nuts against each other on a threaded rod to create a gripping point for turning the rod without damaging its threads. All are 18-8 stainless steel, which is nearly as strong as steel but won’t rust in outdoor, washdown, and other corrosive environments.

DIN 936 nuts are sometimes taller and wider than ISO 4035 nuts. Although it’s no longer active, DIN 936 is still a commonly referenced standard for material and dimensional compatibility.

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

About 10% wider and taller than standard hex nuts, these nuts distribute the load over a large area. They're also known as heavy hex nuts. 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.

Fine threads are closely spaced to prevent loosening from vibration.

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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. Combine with Class 10.9 metric bolts, which have similar strength. All are reusable but lose holding power after each use.

Zinc-plated steel locknuts are corrosion resistant in wet environments.

Some of these locknuts meet ISO 10511 (formerly DIN 985) or ISO 7040 (formerly 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.

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Get a grip on metric bolts exposed to vibration, wear, and changes in temperature. These metric locknuts have a nylon insert that holds onto bolts without damaging their threads. They have fine-pitch threads, which are closer together than coarse-pitch threads and less likely to loosen from vibration. Fine threads and coarse threads are not compatible. These locknuts are reusable but lose holding power with each use.

Made of Class 8 steel, these nuts are strong enough for use with most machinery and equipment. A zinc plating prevents rust in wet and damp areas. Combine them with Class 8.8 metric bolts, which are comparable in strength.

These locknuts meet the dimensional and material standards of DIN and ISO that make sure they're compatible with other parts and tools. Although DIN 982 and 985 are no longer active standards, they’re still a common reference point for designers. With only slight differences in tolerance, ISO 7040 and 10511 have replaced the inactive DIN standards.

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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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Used in pairs or with another bearing retaining nut, these jam nuts—often called shaft nuts—hold bearings, bushings, pulleys, and gears in place on your threaded shaft or spindle. Threading two nuts tightly against each other makes it harder for vibration to loosen your assembly than if you used only one nut. For the nut closer to the bearing, position the stepped face towards the bearing. These jam nuts have holes on the side, so you can tighten and loosen them with a pin spanner wrench. Made of carbon steel, they’re strong and wear resistant. All meet DIN 1816, an international standard for bearing locknut dimensions.

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