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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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Cap Nut Profile Cap Nut Profile |
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About Nuts, Materials, and Finishes
More
Medium-Strength Steel Hex Nuts—Grade 5
These nuts are suitable for fastening most machinery and equipment.
Black ultra-corrosion-resistant coated steel nuts are more corrosion resistant in wet environments than zinc-plated steel nuts. Also known as black luster nuts.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Wd. | Ht. | Specifications Met | Pkg. Qty. | Pkg. | |
Black Ultra-Corrosion-Resistant Coated Steel—Grade 5 | ||||||
|---|---|---|---|---|---|---|
| 1/4"-20 | 7/16" | 7/32" | ASME B18.2.2 | 10 | 000000000 | 00000 |
| 5/16"-18 | 1/2" | 17/64" | ASME B18.2.2 | 10 | 000000000 | 0000 |
| 3/8"-16 | 9/16" | 21/64" | ASME B18.2.2 | 5 | 000000000 | 0000 |
| 7/16"-14 | 11/16" | 3/8" | ASME B18.2.2 | 5 | 000000000 | 0000 |
| 1/2"-13 | 3/4" | 7/16" | ASME B18.2.2 | 5 | 000000000 | 0000 |
| 9/16"-12 | 7/8" | 31/64" | ASME B18.2.2 | 5 | 000000000 | 00000 |
| 5/8"-11 | 15/16" | 35/64" | ASME B18.2.2 | 1 | 000000000 | 0000 |
| 3/4"-10 | 1 1/8" | 41/64" | ASME B18.2.2 | 1 | 000000000 | 0000 |
Aluminum Hex Nuts
One-third the weight of steel, these aluminum nuts are corrosion resistant in wet environments and nonmagnetic. All meet ASME B18 dimensional standards.
Black ultra-corrosion-resistant coated aluminum nuts are more corrosion resistant than uncoated aluminum nuts. They’re also known as black luster nuts.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Wd. | Ht. | Specifications Met | Pkg. Qty. | Pkg. | |
Black Ultra-Corrosion-Resistant Coated 6061 Aluminum | ||||||
|---|---|---|---|---|---|---|
| 8-32 | 11/32" | 1/8" | ASME B18.2.2 | 5 | 000000000 | 00000 |
| 10-24 | 3/8" | 1/8" | ASME B18.2.2 | 5 | 000000000 | 0000 |
| 10-32 | 3/8" | 1/8" | ASME B18.2.2 | 5 | 000000000 | 0000 |
| 1/4"-20 | 7/16" | 7/32" | ASME B18.2.2 | 5 | 000000000 | 0000 |
| 5/16"-18 | 1/2" | 17/64" | ASME B18.2.2 | 5 | 000000000 | 0000 |
| 3/8"-16 | 9/16" | 21/64" | ASME B18.2.2 | 5 | 000000000 | 0000 |
| 1/2"-13 | 3/4" | 7/16" | ASME B18.2.2 | 1 | 000000000 | 0000 |
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. 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. | |
Black Ultra-Corrosion-Resistant Coated Steel—Class 10 | ||||||||
| M4 | 0.7 | 7 | 5 | 220° | DIN 985 | 5 | 000000000 | 00000 |
| M5 | 0.8 | 8 | 5 | 220° | DIN 985 | 5 | 000000000 | 0000 |
| M6 | 1 | 10 | 6 | 220° | DIN 985 | 5 | 000000000 | 0000 |
| M8 | 1.25 | 13 | 8 | 220° | DIN 985 | 5 | 000000000 | 00000 |
| M10 | 1.5 | 17 | 10 | 220° | DIN 985 | 5 | 000000000 | 00000 |
| M12 | 1.75 | 19 | 12 | 220° | DIN 985 | 1 | 000000000 | 0000 |
| M14 | 2 | 22 | 14 | 220° | DIN 985 | 1 | 000000000 | 0000 |
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.
Black ultra-corrosion-resistant coated steel locknuts are more corrosion resistant in wet environments than zinc- and zinc yellow-chromate plated steel locknuts. They're also known as black luster locknuts.
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. | |
Black Ultra-Corrosion-Resistant Coated Steel—Class 8 | ||||||||
| M4 | 0.7 | 7 | 5 | 220° | DIN 985, ISO 10511 | 5 | 000000000 | 00000 |
| M5 | 0.8 | 8 | 5 | 220° | DIN 985, ISO 10511 | 5 | 000000000 | 0000 |
| M6 | 1 | 10 | 6 | 220° | DIN 985, ISO 10511 | 5 | 000000000 | 0000 |
| M8 | 1.25 | 13 | 8 | 220° | DIN 985, ISO 10511 | 5 | 000000000 | 0000 |
| M10 | 1.5 | 17 | 10 | 220° | DIN 985, ISO 10511 | 5 | 000000000 | 00000 |
| M12 | 1.75 | 19 | 12 | 220° | DIN 985, ISO 10511 | 1 | 000000000 | 0000 |
| M14 | 2 | 22 | 14 | 220° | DIN 985, ISO 10511 | 1 | 000000000 | 0000 |
Low-Strength Steel Nylon-Insert Locknuts
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. About half the strength of medium-strength steel locknuts, they're for light duty fastening applications, such as securing access panels.
Black ultra-corrosion-resistant coated steel nuts are more corrosion resistant in wet environments than zinc-plated steel nuts. They're also known as black luster nuts.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Wd. | Ht. | Insert Max. Temp., °F | Pkg. Qty. | Pkg. | |
Black Ultra-Corrosion-Resistant Coated Steel | ||||||
|---|---|---|---|---|---|---|
| 6-32 | 5/16" | 11/64" | 220° | 5 | 000000000 | 00000 |
| 8-32 | 11/32" | 15/64" | 220° | 5 | 000000000 | 0000 |
| 10-24 | 3/8" | 15/64" | 220° | 5 | 000000000 | 0000 |
| 10-32 | 3/8" | 15/64" | 220° | 5 | 000000000 | 0000 |
| 1/4"-20 | 7/16" | 5/16" | 220° | 5 | 000000000 | 0000 |
| 5/16"-18 | 1/2" | 11/32" | 220° | 5 | 000000000 | 0000 |
| 3/8"-16 | 9/16" | 29/64" | 220° | 5 | 000000000 | 0000 |
| 1/2"-13 | 3/4" | 19/32" | 220° | 5 | 000000000 | 00000 |
Low-Strength Steel Thin Nylon-Insert Locknuts
These locknuts are about half the height of standard nylon-insert locknuts. Use them in light duty low-clearance applications or jam one against a hex nut to hold it in place. The nylon insert grips the bolt to resist loosening without damaging threads. They're reusable, but their holding power lessens with each use.
Black ultra-corrosion-resistant coated steel nuts are more corrosion resistant than zinc-plated nuts in wet environments. They're also known as black luster locknuts.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Wd. | Ht. | Insert Max. Temp., °F | Pkg. Qty. | Pkg. | |
Black Ultra-Corrosion-Resistant Coated Steel | ||||||
|---|---|---|---|---|---|---|
| 6-32 | 5/16" | 1/8" | 220° | 5 | 000000000 | 00000 |
| 8-32 | 11/32" | 11/64" | 220° | 5 | 000000000 | 0000 |
| 10-24 | 3/8" | 11/64" | 220° | 5 | 000000000 | 0000 |
| 10-32 | 3/8" | 11/64" | 220° | 5 | 000000000 | 0000 |
| 1/4"-20 | 7/16" | 13/64" | 220° | 5 | 000000000 | 0000 |
| 5/16"-18 | 1/2" | 1/4" | 220° | 5 | 000000000 | 0000 |
| 3/8"-16 | 9/16" | 17/64" | 220° | 5 | 000000000 | 0000 |
| 1/2"-13 | 3/4" | 5/16" | 220° | 5 | 000000000 | 0000 |
Low-Strength Steel Extra-Wide Thin Nylon-Insert Locknuts
These locknuts are about half the height and 10% wider than standard nylon-insert locknuts. Use them in light duty low-clearance applications or jam one against an extra-wide hex nut to hold it in place. The nylon insert grips the bolt to resist loosening without damaging threads. They're reusable, but their holding power lessens with each use.
Black ultra-corrosion-resistant-coated steel locknuts are more corrosion resistant than zinc-plated locknuts in wet environments. They’re also known as black luster locknuts.
For technical drawings and 3-D models, click on a part number.
Metric Medium-Strength Steel Nylon-Insert Flange Locknuts—Class 8
A nylon insert firmly grips threads to resist loosening and a flange distributes the load over a large area. These nuts are reusable, but their holding power lessens with each use. Suitable for fastening most machinery and equipment, they're comparable in strength to Class 8.8 bolts. Height includes the flange.
Black ultra-corrosion-resistant coated steel nuts are more corrosion resistant in wet environments than zinc-plated steel nuts. They're also known as black luster nuts.
For technical drawings and 3-D models, click on a part number.
Thread | Flange | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Size | Pitch, mm | Wd., mm | Ht., mm | Dia., mm | Thick., mm | Insert Max. Temp., °F | Specifications Met | Pkg. Qty. | Pkg. | |
Black Ultra-Corrosion-Resistant Coated Steel—Class 8 | ||||||||||
| M5 | 0.8 | 8 | 7.1 | 11.8 | 1 | 250° | DIN 6926 | 5 | 000000000 | 00000 |
| M6 | 1 | 10 | 9.1 | 14.2 | 1.1 | 250° | DIN 6926 | 5 | 000000000 | 0000 |
| M8 | 1.25 | 13 | 11.1 | 17.9 | 1.2 | 250° | DIN 6926 | 5 | 000000000 | 0000 |
| M12 | 1.75 | 18 | 16.1 | 26 | 1.8 | 250° | DIN 6926 | 5 | 000000000 | 00000 |
Low-Strength Steel Cap Nuts
Also known as acorn nuts, these nuts have a smooth rounded head that covers and protects threads while providing a finished appearance. About half the strength of medium-strength steel cap nuts, use them in light duty fastening applications, such as securing access panels.
Black ultra-corrosion-resistant coated steel cap nuts have excellent resistance to chemicals and salt water.
For technical drawings and 3-D models, click on a part number.
Thread | ||||||
|---|---|---|---|---|---|---|
| Size | Dp. | Wd. | Ht. | Pkg. Qty. | Pkg. | |
Black Ultra-Corrosion-Resistant Coated Steel | ||||||
| 4-40 | 5/32" | 1/4" | 1/4" | 10 | 000000000 | 000000 |
| 6-32 | 5/32" | 5/16" | 11/32" | 10 | 000000000 | 00000 |
| 8-32 | 5/32" | 5/16" | 11/32" | 10 | 000000000 | 00000 |
| 10-24 | 3/16" | 3/8" | 13/32" | 5 | 000000000 | 0000 |
| 10-32 | 3/16" | 3/8" | 13/32" | 5 | 000000000 | 0000 |
| 1/4"-20 | 1/4" | 7/16" | 15/32" | 5 | 000000000 | 0000 |
| 5/16"-18 | 5/16" | 1/2" | 17/32" | 5 | 000000000 | 0000 |
| 3/8"-16 | 3/8" | 9/16" | 5/8" | 1 | 000000000 | 0000 |
| 7/16"-14 | 7/16" | 5/8" | 11/16" | 1 | 000000000 | 0000 |
| 1/2"-13 | 1/2" | 3/4" | 13/16" | 1 | 000000000 | 0000 |
| 9/16"-12 | 9/16" | 7/8" | 15/16" | 1 | 000000000 | 0000 |
| 5/8"-11 | 5/8" | 15/16" | 1" | 1 | 000000000 | 0000 |
Medium-Strength Steel Cap Nuts
Also known as acorn nuts, these nuts have a smooth rounded head that covers and protects threads while providing a finished appearance. Made from Grade 5 steel, they're suitable for fastening most machinery and equipment.
Black ultra-corrosion-resistant coated steel cap nuts have excellent resistance to chemicals and salt water.
For technical drawings and 3-D models, click on a part number.
High-Strength Steel Cap Nuts—Grade 8
Also known as acorn nuts, these nuts have a smooth rounded head that covers and protects threads while providing a finished appearance. They're about 25% stronger than medium-strength steel cap nuts.
Black ultra-corrosion-resistant coated steel cap nuts have excellent resistance to chemicals and salt water.
For technical drawings and 3-D models, click on a part number.