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About Nuts, Materials, and Finishes
More
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.
Zinc-plated steel locknuts resist corrosion in wet environments.
For technical drawings and 3-D models, click on a part number.
Thread Size | Wd. | Ht. | Insert Max. Temp., °F | Pkg. Qty. | Pkg. | |
Black Zinc-Plated Steel | ||||||
---|---|---|---|---|---|---|
6-32 | 5/16" | 1/8" | 220° | 25 | 000000000 | 00000 |
8-32 | 11/32" | 11/64" | 220° | 25 | 000000000 | 0000 |
10-24 | 3/8" | 11/64" | 220° | 25 | 000000000 | 0000 |
10-32 | 3/8" | 11/64" | 220° | 25 | 000000000 | 0000 |
12-24 | 7/16" | 13/64" | 220° | 25 | 000000000 | 0000 |
1/4"-20 | 7/16" | 13/64" | 220° | 25 | 000000000 | 0000 |
5/16"-18 | 1/2" | 1/4" | 220° | 10 | 000000000 | 0000 |
3/8"-16 | 9/16" | 17/64" | 220° | 10 | 000000000 | 0000 |
Steel Locknuts with External-Tooth Lock Washer

Also known as Keps and K-Lock nuts, these locknuts have a free-spinning tooth lock washer that grips the material surface instead of threads for easy installation and mild vibration resistance. Height includes the thickness of the washer. A zinc plating provides corrosion resistance in wet environments.
For technical drawings and 3-D models, click on a part number.
Washer | |||||||
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Thread Size | Wd. | Ht. | Material | OD | Pkg. Qty. | Pkg. | |
Black Zinc-Plated Steel | |||||||
4-40 | 1/4" | 1/8" | Steel | 0.281" | 100 | 000000000 | 00000 |
6-32 | 5/16" | 9/64" | Steel | 0.344" | 100 | 000000000 | 0000 |
8-32 | 11/32" | 5/32" | Steel | 0.375" | 100 | 000000000 | 0000 |
10-24 | 3/8" | 5/32" | Steel | 0.406" | 100 | 000000000 | 00000 |
10-32 | 3/8" | 5/32" | Steel | 0.406" | 100 | 000000000 | 00000 |
1/4"-20 | 7/16" | 7/32" | Steel | 0.5" | 100 | 000000000 | 00000 |
Metric Steel Locknuts with External-Tooth Lock Washer

Also known as Keps and K-lock nuts, these locknuts have a free-spinning tooth lock washer that grips the material surface instead of threads for easy installation and mild vibration resistance. Height includes the thickness of the washer. A zinc plating provides corrosion resistance in wet environments.
For technical drawings and 3-D models, click on a part number.
Low-Strength Steel Square Nuts

Large flat sides make these nuts easy to grip with a wrench and keep them from rotating in channels and square holes. About half the strength of medium-strength steel square nuts, use them in light duty fastening applications, such as securing access panels.
Zinc-plated steel square nuts resist corrosion in wet environments.
For technical drawings and 3-D models, click on a part number.
Metric Low-Strength Steel Square Nuts

Large flat sides make these metric nuts easy to grip with a wrench and keep them from rotating in channels and square holes. About half the strength of medium-strength steel square nuts, use them in light duty fastening applications, such as securing access panels.
Black zinc-plated steel square nuts resist corrosion in wet environments and have a black finish that blends in with dark surfaces.
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. | |
Black Zinc-Plated Steel—Class 5 | |||||||
M4 | 0.7 | 7 | 3 | DIN 557 | 25 | 000000000 | 00000 |
M5 | 0.8 | 8 | 4 | DIN 557 | 25 | 000000000 | 0000 |
M6 | 1 | 10 | 5 | DIN 557 | 25 | 000000000 | 0000 |
M8 | 1.25 | 13 | 6.5 | DIN 557 | 10 | 000000000 | 0000 |
M10 | 1.5 | 17 | 8 | DIN 557 | 10 | 000000000 | 00000 |
M12 | 1.75 | 19 | 10 | DIN 557 | 5 | 000000000 | 0000 |
M16 | 2 | 24 | 13 | DIN 557 | 1 | 000000000 | 0000 |