System of Measurement System of Measurement |
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Thread Size Thread Size | Show |
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Thread Size Thread Size | Hide |
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Thread Type Thread Type |
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Hex Nut Profile Hex Nut Profile |
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Thin | Extra-Wide Thin |
Nut Type Nut Type | Show |
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![]() | Locknut |
Locking Type Locking Type |
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Nylon Insert | Flex-Top |
Material Material |
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Thread Spacing Thread Spacing |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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Drive Style Drive Style |
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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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Thread Direction Thread Direction |
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Insert Maximum Temperature Insert Maximum Temperature |
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Fastener Strength Grade/Class Fastener StrengthGrade/Class |
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About Nuts, Materials, and Finishes
More
High-Strength Steel Extra-Wide Thin Nylon-Insert Locknuts

About half the height and 10% wider than standard nylon-insert locknuts, use these in 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. Comparable in strength to Grade 8 bolts, these locknuts are about three times stronger than low-strength steel extra-wide thin locknuts.
Steel locknuts without a finish are ready to be welded, painted and finished.
For technical drawings and 3-D models, click on a part number.
Thread Size | Wd. | Ht. | Insert Max. Temp., °F | Each | |
Steel—ASTM Grade C | |||||
---|---|---|---|---|---|
1 3/8"-12 | 2 13/64" | 1 3/16" | 250° | 000000000 | 000000 |
Steel Thin Flex-Top Locknuts for Heavy Vibration

About two-thirds the height of standard flex-top locknuts, use these in low-clearance applications or jam one against a hex nut to hold it in place. Threads at the top of the nut expand to grip the bolt on all sides for a stronger hold than distorted-thread locknuts. The strength of the bolt should match the strength of the nut to prevent damaging threads. These locknuts have equivalent strength to Grade 8 steel locknuts.
Plain steel locknuts are uncoated and ready for painting.
For technical drawings and 3-D models, click on a part number.
Thread Size | Wd. | Ht. | Pkg. Qty. | Pkg. | |
Steel | |||||
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1 3/8"-12 | 1 15/16" | 57/64" | 1 | 000000000 | 000000 |