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About Nuts, Materials, and Finishes
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JIS Medium-Strength Steel Hex Nuts

These metric nuts meet JIS (Japanese Industrial Standard) B 1181. Made from Class 8 steel, they're suitable for fastening most machinery and equipment. With a zinc-plated or zinc yellow-chromate plated finish, all 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 | Specifications Met | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel—Class 8 | |||||||
M3 | 0.5 | 5.5 | 2.4 | JIS B 1181 | 100 | 000000000 | 000000 |
M4 | 0.7 | 7 | 3.2 | JIS B 1181 | 100 | 000000000 | 00000 |
M5 | 0.8 | 8 | 4 | JIS B 1181 | 100 | 000000000 | 00000 |
M6 | 1 | 10 | 5 | JIS B 1181 | 50 | 000000000 | 00000 |
M8 | 1.25 | 12 | 6.5 | JIS B 1181 | 25 | 000000000 | 00000 |
M10 | 1.25 | 14 | 8 | JIS B 1181 | 10 | 000000000 | 00000 |
M10 | 1.5 | 14 | 8 | JIS B 1181 | 5 | 000000000 | 0000 |
M12 | 1.25 | 17 | 10 | JIS B 1181 | 5 | 000000000 | 0000 |
Zinc Yellow-Chromate Plated Steel—Class 8 | |||||||
M3 | 0.5 | 5.5 | 2.4 | JIS B 1181 | 50 | 000000000 | 0000 |
M4 | 0.7 | 7 | 3.2 | JIS B 1181 | 50 | 000000000 | 0000 |
M5 | 0.8 | 8 | 4 | JIS B 1181 | 50 | 000000000 | 0000 |
M6 | 1 | 10 | 5 | JIS B 1181 | 25 | 000000000 | 0000 |
M8 | 1.25 | 12 | 6.5 | JIS B 1181 | 10 | 000000000 | 0000 |
M10 | 1.25 | 14 | 8 | JIS B 1181 | 5 | 000000000 | 0000 |
M10 | 1.5 | 14 | 8 | JIS B 1181 | 5 | 000000000 | 0000 |
M12 | 1.25 | 17 | 10 | JIS B 1181 | 5 | 000000000 | 0000 |
JIS 18-8 Stainless Steel Hex Nuts

These metric nuts meet JIS (Japanese Industrial Standard) B 1181. Made from 18-8 stainless steel, they're chemical resistant and may be mildly magnetic.
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 | |||||||
M3 | 0.5 | 5.5 | 2.4 | JIS B 1181 | 50 | 000000000 | 000000 |
M4 | 0.7 | 7 | 3.2 | JIS B 1181 | 50 | 000000000 | 00000 |
M5 | 0.8 | 8 | 4 | JIS B 1181 | 50 | 000000000 | 00000 |
M6 | 1 | 10 | 5 | JIS B 1181 | 25 | 000000000 | 00000 |
M8 | 1.25 | 12 | 6.5 | JIS B 1181 | 10 | 000000000 | 00000 |
M10 | 1.25 | 14 | 8 | JIS B 1181 | 5 | 000000000 | 00000 |
M12 | 1.75 | 17 | 7 | JIS B 1181 | 1 | 000000000 | 00000 |
M14 | 2 | 19 | 8 | JIS B 1181 | 1 | 000000000 | 00000 |
M16 | 2 | 22 | 10 | JIS B 1181 | 1 | 000000000 | 00000 |
M18 | 2.5 | 24 | 11 | JIS B 1181 | 1 | 000000000 | 00000 |
M20 | 2.5 | 27 | 12 | JIS B 1181 | 1 | 000000000 | 00000 |
M22 | 2.5 | 30 | 13 | JIS B 1181 | 1 | 000000000 | 00000 |
JIS High-Strength Steel Flange Nuts

These metric nuts meet JIS (Japanese Industrial Standard) B 1190. They have a flange that distributes pressure where the nut meets the material surface, eliminating the need for a separate washer. About 25% stronger than medium-strength steel flange nuts, they're comparable in strength to Class 10.9 bolts. Height includes the flange.
When choosing your finish, consider your environment. Zinc-plated nuts have a layer of zinc that protects the steel under it from rust, extending the life of the nuts. A black-phosphate finish shields nuts from rusting, even amid oil and grease.
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 | Specifications Met | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel—Class 10 | |||||||||
M5 | 0.8 | 8 | 5 | 11.8 | 0.7 | JIS B 1190 | 50 | 000000000 | 00000 |
M6 | 1 | 10 | 6 | 14 | 0.8 | JIS B 1190 | 100 | 000000000 | 0000 |
M8 | 1.25 | 12 | 8 | 17.5 | 1 | JIS B 1190 | 50 | 000000000 | 0000 |
M10 | 1 | 14 | 10 | 21 | 1.2 | JIS B 1190 | 1 | 000000000 | 0000 |
M10 | 1.25 | 14 | 10 | 21 | 1.2 | JIS B 1190 | 10 | 000000000 | 00000 |
M12 | 1.25 | 17 | 11.5 | 25 | 1.4 | JIS B 1190 | 25 | 000000000 | 0000 |
Black-Phosphate Steel—Class 10 | |||||||||
M6 | 1 | 10 | 6 | 14 | 0.8 | JIS B 1190 | 100 | 000000000 | 00000 |
M8 | 1.25 | 12 | 8 | 17.5 | 1.1 | JIS B 1190 | 100 | 000000000 | 00000 |
M10 | 1.25 | 14 | 10 | 21 | 1.2 | JIS B 1190 | 50 | 000000000 | 00000 |
JIS Medium-Strength Steel Flange Nuts

Made to Japanese Industrial Standards, these nuts fasten most Japanese machinery and equipment without a washer. Their flange distributes pressure where the nut meets the material surface, so there’s no need for a washer. Zinc plated, these nuts won’t rust.
For technical drawings and 3-D models, click on a part number.
Thread | Flange | ||||||||
---|---|---|---|---|---|---|---|---|---|
Size | Pitch, mm | Width, mm | Height, mm | Diameter, mm | Thickness, mm | Specifications Met | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel—Class 8 | |||||||||
M3 | 0.5 | 5.5 | 3.7 | 8 | 0.6 | JIS B 1190 | 100 | 000000000 | 000000 |
M4 | 0.7 | 7 | 4.2 | 10.5 | 0.6 | JIS B 1190 | 100 | 000000000 | 00000 |
M5 | 0.8 | 8 | 5 | 11.8 | 0.7 | JIS B 1190 | 100 | 000000000 | 00000 |
M6 | 1 | 10 | 6 | 14 | 0.8 | JIS B 1190 | 100 | 000000000 | 00000 |
M8 | 1 | 12 | 8 | 17.5 | 1.1 | JIS B 1190 | 10 | 000000000 | 00000 |
M8 | 1.25 | 12 | 8 | 17.5 | 1.1 | JIS B 1190 | 25 | 000000000 | 00000 |
M10 | 1 | 14 | 10 | 21 | 1.2 | JIS B 1190 | 10 | 000000000 | 00000 |
M10 | 1.25 | 14 | 10 | 21 | 1.2 | JIS B 1190 | 5 | 000000000 | 0000 |
M12 | 1.25 | 17 | 11.5 | 25 | 1.4 | JIS B 1190 | 5 | 000000000 | 0000 |
M12 | 1.75 | 17 | 11.5 | 25 | 1.4 | JIS B 1190 | 5 | 000000000 | 0000 |