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Thread Size Thread Size | Show |
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Thread Size Thread Size | Hide |
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Finish Finish |
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Nut Type Nut Type | Show |
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Thread Type Thread Type |
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Locking Type Locking Type |
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| Nylon Insert | Distorted Thread |
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| Cotter Pin | Steel Insert |
Hex Nut Profile Hex Nut Profile |
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Thread Direction Thread Direction |
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Thread Spacing Thread Spacing |
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Thread Fit Thread Fit |
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Drive Style Drive Style |
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Insert Maximum Temperature Insert Maximum Temperature |
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For Cotter Pin Diameter For Cotter Pin Diameter |
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Minimum Slot Depth Minimum Slot Depth |
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Minimum Slot Width Minimum Slot Width |
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Distorted Thread Type Distorted Thread Type |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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About Nuts, Materials, and Finishes
More
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. A zinc plating prevents rust in wet areas. Combine with Class 10.9 metric bolts, which have similar strength. All are reusable but lose holding power after each use.
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  | ||||||||
| M36 | 4 | 55 | 36 | 220° | DIN 985, ISO 10511 | 1 | 000000000 | 000000 |
Metric Fine-Thread High-Strength Steel
Nylon-Insert Locknuts—Class 10
These locknuts have a nylon insert that grips the bolt to resist loosening without damaging threads. They're reusable, but their holding power lessens with each use. They're about 25% stronger than medium-strength steel locknuts and comparable in strength to Class 10.9 bolts. A zinc plating provides corrosion resistance in wet environments.
For technical drawings and 3-D models, click on a part number.
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.
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, the ISO 7040 standard has replaced the inactive DIN 982 standard. The ISO 10511 standard is similar to the inactive DIN 985 standard, except the overall height is a little taller.
Zinc-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 | ||||||||
| M36 | 4 | 55 | 36 | 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 | ||||||||
| M36 | 3 | 55 | 36 | 220° | ISO 10511, DIN 985 | 1 | 000000000 | 000000 |
High-Strength Steel Top-Lock Distorted-Thread Locknuts
An irregularly shaped thread at the top of the nut grips the bolt for a stronger hold than nylon-insert locknuts. They thread on from the bottom of the nut, allowing more threads to engage the bolt before tightening for easier installation than center-lock distorted thread locknuts. The strength of the bolt should match the strength of the nut to prevent damaging threads. They're not reusable. Comparable in strength to Grade 8 bolts, they're about 25% stronger than medium-strength steel locknuts.
Zinc-plated and zinc yellow-chromate plated locknuts resist corrosion in wet environments.
For technical drawings and 3-D models, click on a part number.
Thread | ||||||
|---|---|---|---|---|---|---|
| Size | Pitch, mm | Wd., mm | Ht., mm | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel—Class 10 | ||||||
| M36 | 3 | 55 | 36 | 1 | 000000000 | 00000 |
Metric Medium-Strength Steel Top-Lock
Distorted-Thread Locknuts—Class 8
An irregularly shaped thread at the top of the nut grips the bolt for a stronger hold than nylon-insert locknuts. They thread on from the bottom of the nut, allowing more threads to engage the bolt before tightening for easier installation than center-lock distorted thread locknuts. The strength of the bolt should match the strength of the nut to prevent damaging threads. They're not reusable. Comparable in strength to Class 8.8 bolts, they're suitable for fastening most machinery and equipment. A zinc or zinc yellow-chromate plating provides corrosion resistance in wet environments.
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. | |
Zinc Yellow-Chromate Plated Steel—Class 8 | |||||||
| M36 | 4 | 55 | 36 | DIN 980V | 1 | 000000000 | 00000 |
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.
Metric High-Strength Steel Steel-Insert
Locknuts for Extreme Vibration—Class 10
When installed, the steel insert in these metric locknuts grips the threads and lifts away from the nut body, isolating the insert from the nut’s load to resist spinoff caused by vibration. These locknuts are often used in shakers and vibrating equipment. The strength of the bolt should match the strength of the nut to prevent damaging threads. About 25% stronger than medium-strength steel locknuts, these nuts are made of high-strength, Class 10 steel.
For technical drawings and 3-D models, click on a part number.
Thread | |||||
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| Size | Pitch, mm | Wd., mm | Ht., mm | Each | |
Steel—Class 10 | |||||
| M36 | 4 | 55 | 40.2 | 000000000 | 000000 |