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Hex Nut Profile Hex Nut Profile |
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Standard | Thin |
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Extra Wide |
Fastener Strength Grade/Class Fastener StrengthGrade/Class |
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Thread Spacing Thread Spacing |
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Thread Type Thread Type |
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Thread Direction Thread Direction |
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Finish Finish |
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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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Drive Style Drive Style |
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Nylon Insert | Cotter Pin |
DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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About Nuts, Materials, and Finishes
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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 Washers
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About Threaded Studs and Rods
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Metric Medium-Strength Steel Hex Nuts—Class 8

Class 8 nuts are comparable in strength to Class 8.8 bolts and are suitable for fastening most machinery and equipment.
Black-oxide steel nuts have a dark surface color and are mildly corrosion resistant in dry environments.
For technical drawings and 3-D models, click on a part number.
Metric Fine-Thread Medium-Strength Steel Hex Nuts—Class 8

Class 8 nuts are comparable in strength to Class 8.8 bolts and are suitable for fastening most machinery and equipment.
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—Class 8 | |||||||
M42 | 3 | 65 | 34 | DIN 934 | 1 | 000000000 | 000000 |
Metric High-Strength Steel Hex Nuts—Class 10

About 25% stronger than medium-strength steel nuts, these nuts are comparable in strength to Class 10.9 bolts.
Zinc-plated and zinc yellow-chromate plated steel nuts are corrosion resistant in wet environments.
For technical drawings and 3-D models, click on a part number.
Metric Low-Strength Steel Hex Nuts

About half the strength of medium-strength steel nuts, these nuts are 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.
For technical drawings and 3-D models, click on a part number.
Metric Extreme-Strength Steel Hex Nuts—Class 12

Class 12 nuts are comparable in strength to Class 12.9 bolts. They're about 20% stronger than high-strength steel nuts and often used in heavy machinery, such as earth-moving equipment.
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—Class 12 | |||||||
M42 | 4.5 | 65 | 34 | DIN 934 | 1 | 000000000 | 000000 |
Metric 18-8 Stainless Steel Hex Nuts

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.
For technical drawings and 3-D models, click on a part number.
Metric Super-Corrosion-Resistant 316 Stainless Steel Hex Nuts

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.
For technical drawings and 3-D models, click on a part number.
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 | |||||||
M42 | 4.5 | 65 | 16 | DIN 936 | 1 | 000000000 | 000000 |
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.
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.
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.
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. | |
18-8 Stainless Steel | |||||||
M42 | 4.5 | 65 | 16 | DIN 936 | 1 | 000000000 | 000000 |
Metric Extreme-Strength Steel Extra-Wide Hex Nuts—Grade 2H


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.
For technical drawings and 3-D models, click on a part number.
Metric High-Strength Steel Nylon-Insert Locknuts—Class 10

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.
For technical drawings and 3-D models, click on a part number.
Thread | ||||||||
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Size | Pitch, mm | Wd., mm | Ht., mm | Insert Max. Temp., °F | Specifications Met | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel—Class 10 | ||||||||
M42 | 4.5 | 65 | 42 | 220° | DIN 985, ISO 10511 | 1 | 000000000 | 000000 |
Metric Fine-Thread Medium-Strength Steel Nylon-Insert Locknuts—Class 8

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.
For technical drawings and 3-D models, click on a part number.
Thread | ||||||||
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Size | Pitch, mm | Wd., mm | Ht., mm | Insert Max. Temp., °F | Specifications Met | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel—Class 8 | ||||||||
M42 | 3 | 65 | 42 | 220° | ISO 10511, DIN 985 | 1 | 000000000 | 000000 |
Metric Medium-Strength Steel Locknuts for use with Cotter Pins—Class 8


Often referred to as castle nuts, secure these by inserting a cotter pin or safety wire through the slots and a drilled hole in your bolt for mild loosening resistance. They’re not recommended for use on parts exposed to high vibration because the pin is prone to shearing under prolonged stress. Height includes the slots. Cotter pins are not included.
Steel locknuts are best for dry environments, since moisture will cause them to rust. They are weldable and can be painted or finished.
For technical drawings and 3-D models, click on a part number.
Thread | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|
Size | Pitch, mm | Wd., mm | Ht., mm | For Cotter Pin Dia., mm | Min. Slot Wd., mm | Min. Slot Dp., mm | Specifications Met | Pkg. Qty. | Pkg. | |
Steel—Class 8 | ||||||||||
M42 | 4.5 | 65 | 46 | 8 | 9 | 12 | DIN 935 | 1 | 000000000 | 000000 |
Bearing Retaining Locknuts


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.
For technical drawings and 3-D models, click on a part number.
Thread | Zinc-Plated Carbon Steel | ||||||
---|---|---|---|---|---|---|---|
Size | Pitch, mm | Spacing | OD | Wd., mm | Insert Max. Temp., °F | Each | |
Chamfered Face | |||||||
M42 | 1.5 | Extra Fine | 62mm | 15 | 210° | 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.
For technical drawings and 3-D models, click on a part number.
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 | |||||||
M42 | 1.5 | Extra Fine | 62 | 12 | DIN 1816 | 0000000 | 000000 |
T-Slot Nuts

Designed to slide into T-slot tracks on machine tool tables, use these nuts to secure clamps and workpieces.
Fully threaded nuts allow a stud to extend beyond the bottom of the nut.
For technical drawings and 3-D models, click on a part number.

Base | Fully Threaded | |||||||
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Thread Size | Thread Pitch, mm | For Slot Wd., mm | Ht., mm | Wd., mm | O'all Ht., mm | Specifications Met | Each | |
Black-Oxide Steel | ||||||||
M42 | 4.5 | 48 | 30 | 75 | 60 | DIN 508 | 000000000 | 0000000 |
Setup Studs

Secure setup clamps and fixtures to your machine table, or assemble heavy machines, such as engine mounts. These studs act as a pilot when connecting parts since they’re headless, which eases installation. Unlike a bolt, which has a head, they let you access parts from either end, but they require nuts to hold the part. Pair them with a T-slot or flanged nut when securing to a machine table. Or, put a nut on before your part to work as a float, allowing you to adjust the height of your part. The unthreaded middle is useful for gripping and adjusting. Also known as double-ended studs.
Steel studs are stronger than stainless steel studs. But, unfinished steel studs will rust from air and moisture.
For technical drawings and 3-D models, click on a part number.