System of Measurement System of Measurement |
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Thread Size Thread Size |
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Material Material |
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Finish Finish | Show |
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Finish Finish | Hide |
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Nut Type Nut Type | Show |
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 | Locknut |
Locking Type Locking Type |
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| Nylon Insert | Flex-Top |
Specifications Met Specifications Met |
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Hex Nut Profile Hex Nut Profile |
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 | Standard |
Thread Direction Thread Direction |
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 | Right Hand |
Drive Style Drive Style |
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Insert Maximum Temperature Insert Maximum Temperature |
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Press-Fit Head Shape Press-Fit Head Shape |
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 | Round |
For Minimum Panel Thickness For MinimumPanel Thickness |
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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 | 00000 |
| 6-32 | 5/16" | 3/16" | MS21045-06 | 5 | 000000000 | 0000 |
| 8-32 | 11/32" | 1/4" | MS21045-08 | 5 | 000000000 | 0000 |
| 10-32 | 3/8" | 1/4" | MS21045-3 | 5 | 000000000 | 0000 |
| 1/4"-28 | 7/16" | 5/16" | MS21045-4 | 5 | 000000000 | 0000 |
| 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 | 0000 |
| 1/2"-20 | 3/4" | 39/64" | MS21045-8 | 1 | 000000000 | 0000 |
| 9/16"-18 | 7/8" | 11/16" | MS21045-9 | 1 | 000000000 | 0000 |
| 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 |
Nylon-Insert Press-Fit Locknuts for Sheet Metal
These press-fit nuts have a nylon insert that grips threads to resist loosening and knurls on the bottom of the nut that hold them firmly in place. Press them into a drilled or punched hole with an installation tool or an arbor press. Installation requires access to both sides of the panel.
Cadmium yellow-chromate plated steel locknuts resist corrosion in wet environments.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Drill Bit Size | For Min. Panel Thick. | Flange Dia. | Head Ht. | Insert Max. Temp., °F | Pkg. Qty. | Pkg. | |
Cadmium Yellow-Chromate Plated Steel | ||||||||
|---|---|---|---|---|---|---|---|---|
| 2-56 | 1/8" | 0.06" | 0.17" | 0.08" | 250° | 10 | 000000000 | 00000 |
| 4-40 | 5/32" | 0.06" | 0.2" | 0.09" | 250° | 10 | 000000000 | 0000 |
| 6-32 | 3/16" | 0.06" | 0.28" | 0.13" | 250° | 10 | 000000000 | 0000 |
| 10-32 | 1/4" | 0.06" | 0.34" | 0.18" | 250° | 10 | 000000000 | 0000 |