Thread Size Thread Size |
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Locking Type Locking Type |
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| Distorted Thread | Flex-Top |
Nut Type Nut Type | Show |
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Nut Type Nut Type | Hide |
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Material Material |
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Finish Finish | Show |
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Finish Finish | Hide |
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Hex Nut Profile Hex Nut Profile |
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| Standard | Thin |
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| Extra Wide | Extra-Wide Thin |
Height Height |
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Width Width |
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Thread Direction Thread Direction |
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Fastener Strength Grade/Class Fastener StrengthGrade/Class |
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Drive Style Drive Style |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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Distorted Thread Type Distorted Thread Type |
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 | Top Lock |
RoHS (Restriction of Hazardous Substances) RoHS (Restriction ofHazardous Substances) |
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About Nuts, Materials, and Finishes
More
High-Strength Steel Top-Lock Distorted-Thread Locknuts
An irregularly shaped thread at the top of the nut grips the bolt for a stronger hold than nylon-insert locknuts. They thread on from the bottom of the nut, allowing more threads to engage the bolt before tightening for easier installation than center-lock distorted thread locknuts. The strength of the bolt should match the strength of the nut to prevent damaging threads. They're not reusable. Comparable in strength to Grade 8 bolts, they're about 25% stronger than medium-strength steel locknuts.
Cadmium-plated locknuts resist corrosion in wet environments and have good lubricity, so they thread on smoothly.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Wd. | Ht. | Pkg. Qty. | Pkg. | |
Cadmium-Plated Steel—ASTM Grade C | |||||
|---|---|---|---|---|---|
| 1/4"-20 | 7/16" | 7/32" | 100 | 000000000 | 000000 |
| 1/4"-28 | 7/16" | 7/32" | 100 | 000000000 | 00000 |
| 5/16"-18 | 1/2" | 17/64" | 100 | 000000000 | 00000 |
| 5/16"-24 | 1/2" | 17/64" | 100 | 000000000 | 00000 |
| 3/8"-16 | 9/16" | 21/64" | 100 | 000000000 | 00000 |
| 3/8"-24 | 9/16" | 21/64" | 50 | 000000000 | 00000 |
| 7/16"-14 | 11/16" | 3/8" | 50 | 000000000 | 00000 |
| 7/16"-20 | 11/16" | 3/8" | 50 | 000000000 | 00000 |
| 1/2"-13 | 3/4" | 7/16" | 50 | 000000000 | 00000 |
| 1/2"-20 | 3/4" | 7/16" | 50 | 000000000 | 00000 |
| 9/16"-12 | 7/8" | 31/64" | 25 | 000000000 | 00000 |
| 9/16"-18 | 7/8" | 31/64" | 25 | 000000000 | 00000 |
| 5/8"-11 | 15/16" | 35/64" | 25 | 000000000 | 00000 |
| 5/8"-18 | 15/16" | 35/64" | 25 | 000000000 | 00000 |
| 3/4"-10 | 1 1/8" | 41/64" | 10 | 000000000 | 00000 |
| 3/4"-16 | 1 1/8" | 41/64" | 10 | 000000000 | 00000 |
| 7/8"-9 | 1 5/16" | 3/4" | 10 | 000000000 | 00000 |
| 7/8"-14 | 1 5/16" | 3/4" | 5 | 000000000 | 0000 |
| 1"-8 | 1 1/2" | 55/64" | 5 | 000000000 | 00000 |
| 1"-14 | 1 1/2" | 55/64" | 5 | 000000000 | 00000 |
Extreme-Strength Steel Top-Lock
Distorted-Thread Locknuts
These locknuts have an irregularly shaped thread at the top of the nut that grips the bolt for a stronger hold than nylon-insert locknuts. They thread on from the bottom of the nut, allowing more threads to engage the bolt before tightening for easier installation than center-lock distorted thread locknuts. The strength of the bolt should match the strength of the nut to prevent damaging threads. They're not reusable. About 20% stronger than high-strength steel locknuts, they're often used in heavy machinery, such as earth-moving equipment. A cadmium plating provides corrosion resistance in wet environments and adds lubricity so they thread on smoothly.
For technical drawings and 3-D models, click on a part number.
Steel Flex-Top Locknuts for Heavy Vibration
Threads at the top of these locknuts 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 the threads. These locknuts have equivalent strength to Grade 8 steel locknuts.
Cadmium-plated steel locknuts are corrosion resistant in wet environments. The plating adds lubricity, so they thread on smoothly.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Wd. | Ht. | Pkg. Qty. | Pkg. | |
Cadmium-Plated Steel | |||||
|---|---|---|---|---|---|
| 4-40 | 1/4" | 5/32" | 25 | 000000000 | 000000 |
| 6-32 | 5/16" | 3/16" | 25 | 000000000 | 00000 |
| 8-32 | 11/32" | 1/4" | 25 | 000000000 | 00000 |
| 10-24 | 3/8" | 1/4" | 25 | 000000000 | 00000 |
| 10-32 | 3/8" | 1/4" | 25 | 000000000 | 00000 |
| 1/4"-20 | 7/16" | 19/64" | 25 | 000000000 | 00000 |
| 1/4"-28 | 7/16" | 5/16" | 25 | 000000000 | 00000 |
| 5/16"-18 | 1/2" | 23/64" | 10 | 000000000 | 0000 |
| 5/16"-24 | 1/2" | 23/64" | 10 | 000000000 | 0000 |
| 3/8"-16 | 9/16" | 15/32" | 10 | 000000000 | 00000 |
| 3/8"-24 | 9/16" | 15/32" | 10 | 000000000 | 00000 |
| 7/16"-14 | 5/8" | 15/32" | 5 | 000000000 | 00000 |
| 7/16"-20 | 5/8" | 15/32" | 1 | 000000000 | 0000 |
| 1/2"-13 | 3/4" | 39/64" | 5 | 000000000 | 00000 |
| 1/2"-20 | 3/4" | 39/64" | 5 | 000000000 | 00000 |
| 9/16"-18 | 7/8" | 31/64" | 1 | 000000000 | 00000 |
| 5/8"-11 | 15/16" | 49/64" | 1 | 000000000 | 0000 |
| 5/8"-18 | 15/16" | 49/64" | 1 | 000000000 | 0000 |
| 3/4"-10 | 1 1/16" | 57/64" | 1 | 000000000 | 0000 |
| 3/4"-16 | 1 1/16" | 57/64" | 1 | 000000000 | 0000 |
| 7/8"-9 | 1 1/4" | 1 1/64" | 1 | 000000000 | 00000 |
| 7/8"-14 | 1 1/4" | 1 1/64" | 1 | 000000000 | 00000 |
| 1"-8 | 1 7/16" | 1 9/64" | 1 | 000000000 | 00000 |
| 1"-14 | 1 7/16" | 1 9/64" | 1 | 000000000 | 00000 |
Metric Steel Flex-Top Locknuts for Heavy Vibration
These locknuts have threads at the top of the nut that 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.
Cadmium-plated steel locknuts are corrosion resistant in wet environments. The plating adds lubricity, so they thread on smoothly.
For technical drawings and 3-D models, click on a part number.
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.
Cadmium-plated locknuts are corrosion resistant in wet environments. The plating adds lubricity so they thread on smoothly.
| Thread Size | Wd. | Ht. | Pkg. Qty. | Pkg. | |
Cadmium-Plated Steel | |||||
|---|---|---|---|---|---|
| 6-32 | 5/16" | 9/64" | 25 | 000000000 | 000000 |
| 8-32 | 11/32" | 3/16" | 25 | 000000000 | 00000 |
| 10-24 | 3/8" | 3/16" | 25 | 000000000 | 00000 |
| 10-32 | 3/8" | 3/16" | 25 | 000000000 | 00000 |
| 1/4"-20 | 7/16" | 7/32" | 25 | 000000000 | 00000 |
| 1/4"-28 | 7/16" | 7/32" | 25 | 000000000 | 00000 |
| 5/16"-18 | 1/2" | 17/64" | 10 | 000000000 | 0000 |
| 5/16"-24 | 1/2" | 17/64" | 10 | 000000000 | 00000 |
| 3/8"-16 | 9/16" | 9/32" | 10 | 000000000 | 00000 |
| 3/8"-24 | 9/16" | 9/32" | 10 | 000000000 | 00000 |
| 7/16"-20 | 5/8" | 21/64" | 5 | 000000000 | 00000 |
| 1/2"-13 | 3/4" | 21/64" | 5 | 000000000 | 00000 |
| 1/2"-20 | 3/4" | 21/64" | 5 | 000000000 | 00000 |
| 5/8"-11 | 15/16" | 13/32" | 1 | 000000000 | 0000 |
| 5/8"-18 | 15/16" | 13/32" | 1 | 000000000 | 0000 |
| 3/4"-10 | 1 1/16" | 27/64" | 1 | 000000000 | 0000 |
| 3/4"-16 | 1 1/16" | 27/64" | 1 | 000000000 | 0000 |
| 7/8"-9 | 1 1/4" | 31/64" | 1 | 000000000 | 00000 |
| 1"-8 | 1 7/16" | 37/64" | 1 | 000000000 | 00000 |
| 1"-14 | 1 7/16" | 37/64" | 1 | 000000000 | 00000 |
| 1 1/8"-12 | 1 5/8" | 41/64" | 1 | 000000000 | 00000 |
| 1 1/4"-12 | 1 13/16" | 49/64" | 1 | 000000000 | 00000 |
| 1 1/2"-12 | 2 3/16" | 57/64" | 1 | 000000000 | 00000 |
Steel Extra-Wide Flex-Top Locknuts for Heavy Vibration
These locknuts are about 10% wider than standard flex-top locknuts to distribute the load over a large area. 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. A cadmium plating provides corrosion resistance in wet environments and adds lubricity so they thread on smoothly.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Wd. | Ht. | Pkg. Qty. | Pkg. | |
Cadmium-Plated Steel | |||||
|---|---|---|---|---|---|
| 1/4"-20 | 1/2" | 19/64" | 10 | 000000000 | 000000 |
| 5/16"-18 | 9/16" | 21/64" | 10 | 000000000 | 00000 |
| 3/8"-16 | 5/8" | 25/64" | 10 | 000000000 | 00000 |
| 1/2"-13 | 13/16" | 1/2" | 5 | 000000000 | 00000 |
| 5/8"-11 | 1" | 41/64" | 1 | 000000000 | 0000 |
| 3/4"-10 | 1 1/8" | 49/64" | 1 | 000000000 | 0000 |
| 7/8"-9 | 1 5/16" | 57/64" | 1 | 000000000 | 00000 |
| 1"-8 | 1 1/2" | 1 1/64" | 1 | 000000000 | 00000 |
Extra-Wide Thin Flex-Top Locknuts for Heavy Vibration
About half the height and 10% wider than standard hex nuts, use these locknuts in low-clearance applications or jam one against an extra-wide 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. A cadmium plating provides corrosion resistance in wet environments and adds lubricity so they thread on smoothly.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Wd. | Ht. | Pkg. Qty. | Pkg. | |
Cadmium-Plated Steel | |||||
|---|---|---|---|---|---|
| 1/4"-20 | 1/2" | 7/32" | 25 | 000000000 | 000000 |
| 5/16"-18 | 9/16" | 17/64" | 10 | 000000000 | 0000 |
| 3/8"-16 | 5/8" | 9/32" | 10 | 000000000 | 00000 |
| 7/16"-14 | 3/4" | 21/64" | 1 | 000000000 | 0000 |
| 1/2"-13 | 13/16" | 21/64" | 5 | 000000000 | 00000 |
| 5/8"-11 | 1" | 13/32" | 1 | 000000000 | 0000 |
| 3/4"-10 | 1 1/8" | 27/64" | 1 | 000000000 | 00000 |
| 7/8"-9 | 1 5/16" | 31/64" | 1 | 000000000 | 00000 |
| 1"-8 | 1 1/2" | 37/64" | 1 | 000000000 | 00000 |