System of Measurement System of Measurement |
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Nut Type Nut Type | Show |
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Hex Nut Profile Hex Nut Profile | Show |
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Hex Nut Profile Hex Nut Profile | Hide |
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Standard | Thin |
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Extra Wide | Narrow |
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High | Extra-Wide Thin |
Locking Type Locking Type |
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Fastener Strength Grade/Class Fastener StrengthGrade/Class |
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Finish Finish |
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Material Material |
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Thread Spacing Thread Spacing |
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Thread Type Thread Type |
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Thread Direction Thread Direction |
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Drive Style Drive Style |
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Insert Maximum Temperature Insert Maximum Temperature |
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REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration,Evaluation, Authorization and Restriction of Chemicals) |
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RoHS (Restriction of Hazardous Substances) RoHS (Restriction ofHazardous Substances) |
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Thread Fit Thread Fit |
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About Nuts, Materials, and Finishes
More
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 | ||||||||
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Size | Pitch, mm | Wd., mm | Ht., mm | Insert Max. Temp., °F | Specifications Met | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel—Class 8 | ||||||||
M4 | 0.7 | 7 | 5.3 | 220° | DIN 982, ISO 7040 | 100 | 000000000 | 00000 |
M5 | 0.8 | 8 | 6.3 | 220° | DIN 982, ISO 7040 | 100 | 000000000 | 0000 |
M6 | 1 | 10 | 8 | 220° | DIN 982, ISO 7040 | 100 | 000000000 | 00000 |
M8 | 1.25 | 13 | 9.5 | 220° | DIN 982, ISO 7040 | 50 | 000000000 | 00000 |
M10 | 1.5 | 17 | 11.5 | 220° | DIN 982, ISO 7040 | 25 | 000000000 | 00000 |
M12 | 1.75 | 19 | 14 | 220° | DIN 982, ISO 7040 | 25 | 000000000 | 00000 |
M14 | 2 | 22 | 16 | 220° | DIN 982, ISO 7040 | 10 | 000000000 | 0000 |
M16 | 2 | 24 | 18 | 220° | DIN 982, ISO 7040 | 10 | 000000000 | 00000 |
M18 | 2.5 | 27 | 20 | 220° | DIN 982, ISO 7040 | 5 | 000000000 | 00000 |
M20 | 2.5 | 30 | 22 | 220° | DIN 982, ISO 7040 | 1 | 000000000 | 0000 |
M22 | 2.5 | 32 | 25 | 220° | DIN 982, ISO 7040 | 1 | 000000000 | 0000 |
M24 | 3 | 36 | 28 | 220° | DIN 982, ISO 7040 | 1 | 000000000 | 0000 |