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Hex Nut Profile Hex Nut Profile |
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Standard | Thin |
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Fastener Strength Grade/Class Fastener StrengthGrade/Class |
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Thread Direction Thread Direction |
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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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REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration,Evaluation, Authorization and Restriction of Chemicals) |
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Locking Type Locking Type |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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Insert Maximum Temperature Insert Maximum Temperature |
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About Nuts, Materials, and Finishes
More
About Selecting Shock Absorbers
To select the best shock absorber for your application, you need to find the energy capacity your application requires. Use this formula to calculate the energy capacity required to stop a horizontal-moving load. For example, if you have a 250-lb. load moving at 25 inches per second, your calculation is (250 lbs. ÷ 772) × 252 = 202.4 in.-lbs. energy capacity.
Note: Choose a shock absorber with a higher energy capacity than you calculated. Factors such as driving force or an inclined surface will increase the energy capacity required.
Energy Capacity (in.-lbs.) = (Weight, lbs./772) × Velocity2 (in. per second)
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.
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 | |||||||
M33 | 3.5 | 50 | 26 | 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 Fine-Thread 18-8 Stainless Steel Hex Nuts

Made from 18-8 stainless steel, these nuts have good chemical resistance and may be mildly magnetic. They're 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 | |||||||
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Size | Pitch, mm | Wd., mm | Ht., mm | Specifications Met | Pkg. Qty. | Pkg. | |
Steel | |||||||
M33 | 3.5 | 50 | 14 | DIN 936 | 1 | 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.
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.
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 | ||||||||
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Size | Pitch, mm | Spacing | Wd., mm | Ht., mm | Specifications Met | Pkg. Qty. | Pkg. | |
Steel—Class 04 | ||||||||
M33 | 2 | Fine | 50 | 16.5 | DIN 439B, ISO 4035 | 1 | 000000000 | 000000 |
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.
Thread Size | Thread Pitch, mm | Wd. | Ht. | Specifications Met | Pkg. Qty. | Pkg. | |
Black-Oxide Steel—Class 04 | |||||||
---|---|---|---|---|---|---|---|
M33 | 3.5 | 50mm | 16.5mm | ASTM A108, DIN 439B, ISO 4035 | 1 | 000000000 | 000000 |
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 | |||||||
M33 | 3.5 | 50 | 14 | DIN 936 | 1 | 000000000 | 000000 |
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.
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.
Thread | ||||||||
---|---|---|---|---|---|---|---|---|
Size | Pitch, mm | Spacing | Wd., mm | Ht., mm | Specifications Met | Pkg. Qty. | Pkg. | |
316 Stainless Steel | ||||||||
M33 | 2 | Fine | 50 | 16.5 | DIN 439B; ISO 4035 | 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.
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. | |
Steel—ASTM Grade 2H | ||||||||
M33 | 3.5 | Coarse | 55 | 33 | ASTM A194, DIN 6915 | 1 | 000000000 | 000000 |
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 | ||||||||
---|---|---|---|---|---|---|---|---|
Size | Pitch, mm | Wd., mm | Ht., mm | Insert Max. Temp., °F | Specifications Met | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel—Class 10 | ||||||||
M33 | 3.5 | 50 | 33 | 220° | DIN 985, ISO 10511 | 1 | 000000000 | 000000 |
Metric Medium-Strength Steel Nylon-Insert Locknuts—Class 8

Made from medium-strength steel with a nylon insert, these Class 8 metric locknuts are strong enough to use on most machinery and equipment that’s prone to vibration and temperature changes. The nylon insert also won’t damage the threads on your bolt. All are reusable, but their holding power lessens with each use. Pair them with compatible Class 8.8 metric bolts.
Most of these locknuts meet ISO 7040 or ISO 10511 (formerly DIN 982 or DIN 985), which are international standards for dimensions. The ISO standards are functionally equivalent to the DIN standards with slight differences in width, height, or tolerances.
Zinc- and zinc yellow-chromate plated steel locknuts are a good option in dry environments. The zinc plating prevents the steel from corroding until the plating wears away.
For technical drawings and 3-D models, click on a part number.
Thread | ||||||||
---|---|---|---|---|---|---|---|---|
Size | Pitch, mm | Wd., mm | Ht., mm | Insert Max. Temp., °F | Specifications Met | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel—Class 8 | ||||||||
M33 | 3.5 | 50 | 33 | 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 | ||||||||
---|---|---|---|---|---|---|---|---|
Size | Pitch, mm | Wd., mm | Ht., mm | Insert Max. Temp., °F | Specifications Met | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel—Class 8 | ||||||||
M33 | 2 | 50 | 33 | 220° | ISO 10511, DIN 985 | 1 | 000000000 | 000000 |
Metric 18-8 Stainless Steel Coupling Nuts

Made from 18-8 stainless steel, these metric coupling nuts have good chemical resistance and may be mildly magnetic. Also known as extension nuts, use them to connect and extend threaded rods.
For technical drawings and 3-D models, click on a part number.
Thread | Each | ||||||
---|---|---|---|---|---|---|---|
Size | Pitch, mm | Lg., mm | Wd., mm | Specifications Met | 1-9 | 10-Up | |
18-8 Stainless Steel | |||||||
M33 | 3.5 | 99 | 50 | DIN 6334 | 000000000 | 0000000 | 000000 |
Mounting Nuts for Shock Absorbers

Use Mounting Blocks for Shock Absorbers (not included) to mount and secure threaded-body shock absorbers.
Steel | |||
---|---|---|---|
Thread Size | Thread Pitch, mm | Each | |
Hex Nut | |||
M33 | 1.5 | 0000000 | 000000 |