These nuts tighten when turned to the left; once fastened, they resist loosening from counterclockwise motion. Also known as jam nuts, they 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.

Black-oxide steel nuts have a dark surface color and are mildly corrosion resistant in dry environments. They also meet DIN dimensional standards.

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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 Although it’s no longer active, DIN 936 is still a commonly referenced standard for material and dimensional compatibility.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.

Made with fine-pitch threads, vibration is less likely to loosen these metric nuts than those with coarse-pitch threads since the threads sit closer together. Fine and coarse threads are not compatible. Also called jam nuts, they are roughly half the height of standard hex nuts, so they’re good for applications with low clearance. However, they have less tensile strength than standard height nuts. Often used as locknuts, thread two against each other to further prevent loosening caused by vibration. You can also do this on a threaded rod, which creates a gripping point so you can turn it without damaging the threads. All are 18-8 stainless steel, which is almost as strong as steel but also won’t rust in outdoor, washdown, and other corrosive environments.

DIN 936 nuts are sometimes slightly taller and wider than DIN 439B nuts. Although it’s no longer active, DIN 936 remains a commonly referenced standard for material and dimensional compatibility.

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

These nuts tighten when turned to the left; once fastened, they resist loosening from counterclockwise motion. They have good chemical resistance and may be mildly magnetic. Also known as jam nuts, they 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.

Black-oxide nuts have a dark surface color.

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

These metric nuts are made of 316 stainless steel and half as tall as regular hex nuts—use them around chemicals and salt water when space is limited. Also known as jam nuts, they can be tightened in pairs to prevent loosening from vibration. Jamming two of these nuts together can also create a gripping point on a threaded rod, letting you use a wrench to turn the rod without damaging the threads.

Nuts with fine and extra-fine threads are less likely to loosen from vibration than those with coarse threads. Fine and extra-fine threads aren’t compatible with coarse threads.

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

ISO 4035 (formerly DIN 439B) nuts are chamfered, so their edges are less sharp than DIN 936 nuts. This new ISO standard is functionally the same as the DIN standard it replaced, with slightly different tolerances for width.

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

Made of 316 stainless steel for excellent corrosion resistance—including in salt water—these nuts tighten to the left and won’t loosen from counterclockwise motion. For use in low-clearance areas, they’re half the height of standard hex nuts. They can also be jammed against another nut to hold it in place. When used with a standard hex nut, they’re good for fastening most equipment.

Nuts that meet DIN 439B comply with international dimensional and material standards. Although no longer active, this standard is often referenced for compatibility.

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