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Specifications Met Specifications Met |
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System of Measurement System of Measurement |
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Locking Type Locking Type |
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 | Flex-Top |
Finish Finish |
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Material Material |
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Thread Fit Thread Fit |
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Thread Direction Thread Direction |
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Hex Nut Profile Hex Nut Profile |
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 | Standard |
DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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Drive Style Drive Style |
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About Nuts, Materials, and Finishes
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Mil. Spec. Steel Flex-Top Locknuts for Heavy Vibration
Choose these locknuts for their adherence to strict military standards for material and construction. 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 yellow-chromate 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. | Specifications Met | Pkg. Qty. | Pkg. | |
Cadmium Yellow-Chromate Plated Steel | ||||||
|---|---|---|---|---|---|---|
| 4-40 | 1/4" | 5/32" | MS21045-04 | 5 | 000000000 | 000000 |
| 6-32 | 5/16" | 3/16" | MS21045-06 | 5 | 000000000 | 0000 |
| 8-32 | 11/32" | 1/4" | MS21045-08 | 5 | 000000000 | 00000 |
| 10-32 | 3/8" | 1/4" | MS21045-3 | 5 | 000000000 | 0000 |
| 1/4"-28 | 7/16" | 5/16" | MS21045-4 | 5 | 000000000 | 00000 |
| 5/16"-24 | 1/2" | 23/64" | MS21045-5 | 5 | 000000000 | 00000 |
| 3/8"-24 | 9/16" | 15/32" | MS21045-6 | 5 | 000000000 | 00000 |
| 7/16"-20 | 11/16" | 15/32" | MS21045-7 | 1 | 000000000 | 00000 |
| 1/2"-20 | 3/4" | 39/64" | MS21045-8 | 1 | 000000000 | 00000 |
| 9/16"-18 | 7/8" | 11/16" | MS21045-9 | 1 | 000000000 | 00000 |
| 5/8"-18 | 15/16" | 49/64" | MS21045-10 | 1 | 000000000 | 00000 |
| 3/4"-16 | 1 1/16" | 57/64" | MS21045-12 | 1 | 000000000 | 00000 |