System of Measurement System of Measurement |
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Thread Size Thread Size | Show |
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Material Material |
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Thread Direction Thread Direction |
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Right Hand | Left Hand |
Panel Nut Shape Panel Nut Shape |
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Thread Type Thread Type |
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Thread Fit Thread Fit |
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Drive Style Drive Style |
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REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration,Evaluation, Authorization and Restriction of Chemicals) |
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RoHS (Restriction of Hazardous Substances) RoHS (Restriction ofHazardous Substances) |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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Locking Type Locking Type |
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![]() | Nylon Insert |
Insert Maximum Temperature Insert Maximum Temperature |
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About Shaft Collars
Shaft collars are useful for holding and positioning components on a shaft. They can also serve as mechanical stops and stroke limiters.
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About Nuts, Materials, and Finishes
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Metric Medium-Strength Steel Thin Hex Nuts

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 Although it’s no longer active, DIN 936 is still a commonly referenced standard for material and dimensional compatibility.
For technical drawings and 3-D models, click on a part number.
Thread | |||||||
---|---|---|---|---|---|---|---|
Size | Pitch, mm | Wd., mm | Ht., mm | Specifications Met | Pkg. Qty. | Pkg. | |
Steel | |||||||
M18 | 2.5 | 27 | 9 | DIN 936 | 10 | 000000000 | 00000 |
Metric Fine-Thread Medium-Strength Steel Thin Hex Nuts


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.
For technical drawings and 3-D models, click on a part number.
Thread | |||||||
---|---|---|---|---|---|---|---|
Size | Pitch, mm | Wd., mm | Ht., mm | Specifications Met | Pkg. Qty. | Pkg. | |
Steel | |||||||
M18 | 1.5 | 27 | 9 | DIN 936 | 10 | 000000000 | 00000 |
Low-Strength Steel Thin Hex Nuts

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.
For technical drawings and 3-D models, click on a part number.
Thread | ||||||||
---|---|---|---|---|---|---|---|---|
Size | Pitch, mm | Spacing | Wd., mm | Ht., mm | Specifications Met | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel—Class 04 | ||||||||
M18 | 1.5 | Fine | 27 | 9 | DIN 439B, ISO 4035 | 10 | 000000000 | 00000 |
M18 | 2.5 | Coarse | 27 | 9 | DIN 439B, ISO 4035 | 10 | 000000000 | 0000 |
Zinc Yellow-Chromate Plated Steel—Class 04 | ||||||||
M18 | 1.5 | Fine | 27 | 9 | DIN 439B, ISO 4035 | 5 | 000000000 | 0000 |
Steel—Class 04 | ||||||||
M18 | 1.5 | Fine | 27 | 9 | DIN 439B, ISO 4035 | 10 | 000000000 | 0000 |
Left-Hand Threaded Low-Strength Steel Thin Hex Nuts


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.
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.
Metric 18-8 Stainless Steel Thin Hex Nuts

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.
ISO 4035 nuts are functionally the same as DIN 439B nuts (sometimes called DIN 439-2), but have slightly different width tolerances. These nuts have chamfered edges that make them less sharp than DIN 936 nuts.
For technical drawings and 3-D models, click on a part number.
Metric Fine-Thread 18-8 Stainless Steel Thin Hex Nuts



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.
ISO 4035 nuts are functionally the same as DIN 439B nuts (sometimes also referred to as DIN 439-2), but have slightly different width tolerances. This ISO spec replaces the DIN spec, however DIN 439B is still a common reference point. These nuts have chamfered edges, so they’re less sharp than DIN 936 nuts.
For technical drawings and 3-D models, click on a part number.
Metric Super-Corrosion-Resistant 316 Stainless Steel Thin Hex Nuts

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.
Left-Hand Threaded Super-Corrosion-Resistant 316 Stainless Steel Thin Hex Nuts


With threads that tighten to the left and made of 316 stainless steel, these nuts won’t loosen from counterclockwise motion in saltwater and corrosive environments. They’re half the height of standard hex nuts, so they fit where there’s low clearance. Sometimes called jam nuts, you can also jam them against standard nuts to hold them in place when fastening machines and equipment.
All metric nuts meet DIN standards and some also meet ISO standards, which means they adhere to strict dimensional and material requirements. While DIN is no longer active, it's often referenced for compatibility.
For technical drawings and 3-D models, click on a part number.
Thread Size | Thread Pitch | Width | Height | Specifications Met | Each | |
316 Stainless Steel | ||||||
---|---|---|---|---|---|---|
M18 | 1.5mm | 27mm | 9mm | DIN 439B, ISO 4035 | 000000000 | 000000 |
Left-Hand Threaded Brass Thin Hex Nuts

These nuts tighten to the left and won’t loosen from counterclockwise motion. Made from brass, they resist corrosion, conduct electricity, and are nonmagnetic. They’re half the height of standard hex nuts, so they’re good for use in low-clearance areas. Jam them against another nut to hold them in place. When used with a standard hex nut, they’re suitable for fastening most equipment.
Nuts that meet DIN 439B comply with international standards for dimensions and materials. Although no longer active, this standard is often referenced for compatibility.
For technical drawings and 3-D models, click on a part number.
Thread Size | Thread Pitch | Width | Height | Specifications Met | Each | |
Brass | ||||||
---|---|---|---|---|---|---|
M18 | 1.5mm | 27mm | 9mm | DIN 439B, ISO 4035 | 000000000 | 000000 |
Metric Low-Profile Low-Strength Steel Nylon-Insert Locknuts

With a shorter hex height than standard DIN 985 locknuts, these nylon-insert locknuts meet international ISO 10511 dimensional standards and are easy to install in tight spaces. The nylon insert grips the bolt thread to keep them from loosening without damaging the threads, so they're good for use on machinery and equipment that's prone to vibration. These locknuts can be removed and reinstalled; however, their holding power weakens with each use. Use them for light duty fastening applications, such as securing access panels. Made of zinc-plated steel, they won't corrode in wet environments.
For technical drawings and 3-D models, click on a part number.
Thread | ||||||||
---|---|---|---|---|---|---|---|---|
Size | Pitch, mm | Width, mm | Height, mm | Insert Maximum Temperature, °F | Specifications Met | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel | ||||||||
M18 | 2.5 | 26 | 13 | 245° | ISO 10511 | 1 | 000000000 | 00000 |
Steel Hex Panel Nuts

Fasten these panel nuts with a wrench for more torque while tightening than knurled panel nuts. Also known as dress nuts, they're extremely thin for use in tight spaces such as electrical panels.
Zinc-plated steel nuts resist corrosion in wet environments.
For technical drawings and 3-D models, click on a part number.
Thread Size | Thread Pitch, mm | Wd., mm | Ht., mm | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel | ||||||
---|---|---|---|---|---|---|
M18 | 1.5 | 24 | 6 | 1 | 000000000 | 00000 |
Bearing Retaining Jam Nuts


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.
For technical drawings and 3-D models, click on a part number.
Thread | |||||||
---|---|---|---|---|---|---|---|
Size | Pitch, mm | Spacing | OD, mm | Wd., mm | Specifications Met | Each | |
Carbon Steel | |||||||
Stepped Face | |||||||
M18 | 1.5 | Fine | 34 | 8 | DIN 1816 | 0000000 | 000000 |
Bearing Retaining Nuts

Often paired with spring lock washers to strengthen their hold, these retaining nuts—also known as shaft nuts—keep vibration from shifting bearings, bushings, pulleys, and gears on your threaded shaft or spindle. They have slotted sides, so you can tighten and loosen them with a spanner wrench or spanner socket. Made of carbon steel, they’re strong and wear resistant.
Use stepped-face retaining nuts with DIN 462 spring lock washers. You can also use them in pairs or with other bearing retaining nuts as jam nuts. For the nut closer to the bearing, position the stepped face towards the bearing. All meet DIN standards for bearing lockout dimensions.
Chamfered-face retaining nuts weigh less and produce less heat than stepped-face nuts. They meet ISO 2982 (formerly DIN 981), an international standard for bearing locknut dimensions. Their sizes correspond to SKF KM series. Use them with DIN 5406 spring lock washers.
For technical drawings and 3-D models, click on a part number.