System of Measurement System of Measurement |
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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 |
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| Flange | Hex |
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| Locknut | Rivet Mount |
Specifications Met Specifications Met |
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Locking Type Locking Type |
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| Distorted Thread | Flex-Top |
Thread Fit Thread Fit |
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Hex Nut Profile Hex Nut Profile |
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 | Standard |
DFARS (Defense Acquisition Regulations Supplement) DFARS (DefenseAcquisition Regulations Supplement)  |
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Thread Direction Thread Direction |
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Drive Style Drive Style |
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 | External Hex |
Thread Type Thread Type |
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Barrel Profile Barrel Profile |
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 | Low |
Lubrication Lubrication |
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About Nuts, Materials, and Finishes
More
Mil. Spec. Stainless Steel Flex-Top
Locknuts for Heavy Vibration
Choose these locknuts for their adherence to strict military standards for material and construction. Made from 18-8 stainless steel, they have good chemical resistance and may be mildly magnetic. 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. A silver plating 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. | |
Silver-Plated 18-8 Stainless Steel | ||||||
|---|---|---|---|---|---|---|
| 4-40 | 1/4" | 9/64" | MS21046C-04 | 1 | 000000000 | 00000 |
| 6-32 | 5/16" | 11/64" | MS21046C-06 | 1 | 000000000 | 0000 |
| 8-32 | 11/32" | 15/64" | MS21046C-08 | 1 | 000000000 | 0000 |
| 10-32 | 3/8" | 15/64" | MS21046C-3 | 1 | 000000000 | 0000 |
| 1/4"-28 | 7/16" | 9/32" | MS21046C-4 | 1 | 000000000 | 0000 |
| 3/8"-24 | 9/16" | 25/64" | MS21046C-6 | 1 | 000000000 | 0000 |
Stainless Steel Distorted-Thread Flange Locknuts
These flange locknuts have excellent resistance to chemicals and salt water. They have an irregularly-shaped thread that grips the bolt for a stronger hold than nylon-insert flange locknuts. A flange that distributes pressure where the nut meets the material surface, eliminating the need for a separate washer. They're not reusable. Nuts may be mildly magnetic. Height includes the flange.
For technical drawings and 3-D models, click on a part number.
Flange | ||||||||
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| Thread Size | Wd. | Ht. | Dia. | Thick. | Specifications Met | Pkg. Qty. | Pkg. | |
Silver-Plated A286 Stainless Steel | ||||||||
| 4-40 | 5/32" | 1/8" | 0.206" | 0.03" | MS21043-04 | 1 | 000000000 | 00000 |
| 6-32 | 3/16" | 9/64" | 0.244" | 0.03" | MS21043-06 | 5 | 000000000 | 0000 |
| 8-32 | 7/32" | 3/16" | 0.29" | 0.03" | MS21043-08 | 1 | 000000000 | 0000 |
| 10-32 | 1/4" | 3/16" | 0.33" | 0.03" | MS21043-3 | 1 | 000000000 | 0000 |
| 1/4"-28 | 5/16" | 7/32" | 0.42" | 0.04" | MS21043-4 | 5 | 000000000 | 0000 |
| 5/16"-24 | 3/8" | 17/64" | 0.52" | 0.04" | MS21043-5 | 1 | 000000000 | 0000 |
| 3/8"-24 | 7/16" | 9/32" | 0.62" | 0.04" | MS21043-6 | 1 | 000000000 | 0000 |
Mil. Spec. Rivet-Mount Nuts
Create threads in hard-to-work areas—where you can’t reach the back of a workpiece, or material is too thin to be tapped. For a strong grip, these nuts have distorted threads that increase friction with bolts. Because they mount with two rivets, they won’t spin when you’re tightening screws. However, these nuts do move inside their retainers, which lets you install bolts at a slight angle; use them to align with off-center parts. All meet military guidelines for dimensions and material.
A286 stainless steel nuts are corrosion resistant. Silver-plated stainless steel nuts withstand temperatures up to 800° F. The silver plating also adds lubricity and prevents seizing caused by friction between nuts and bolts.
For technical drawings and 3-D models, click on a part number.
Base | Barrel | Mounting | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Thread Size | Lg. | Wd. | Thick. | Dia. | Ht. | No. of Holes | Hole Dia. | Hole Ctr.-to-Ctr. | Specifications Met | Each | |
Silver-Plated A286 Stainless Steel—Unlubricated | |||||||||||
| 4-40 | 21/32" | 5/16" | 3/32" | 0.141" | 1/16" | 2 | 0.098" | 13/32" | MS21076-04N | 000000000 | 00000 |
| 4-40 | 61/64" | 13/32" | 1/32" | 0.141" | 9/64" | 2 | 0.098" | 11/16" | MS21060-04 | 000000000 | 0000 |
| 6-32 | 61/64" | 13/32" | 1/32" | 0.156" | 11/64" | 2 | 0.098" | 11/16" | MS21060-06 | 000000000 | 0000 |
| 8-32 | 45/64" | 23/64" | 3/32" | 0.168" | 5/32" | 2 | 0.098" | 15/32" | MS21076-08N | 000000000 | 0000 |
| 8-32 | 61/64" | 13/32" | 1/32" | 0.168" | 7/32" | 2 | 0.098" | 11/16" | MS21060-08 | 000000000 | 0000 |
| 10-32 | 47/64" | 13/32" | 3/32" | 0.194" | 5/32" | 2 | 0.098" | 1/2" | MS21076-3N | 000000000 | 0000 |
| 10-32 | 61/64" | 13/32" | 1/32" | 0.194" | 7/32" | 2 | 0.098" | 11/16" | MS21060-3 | 000000000 | 0000 |
| 1/4"-28 | 51/64" | 1/2" | 3/32" | 0.254" | 3/16" | 2 | 0.098" | 9/16" | MS21076-4N | 000000000 | 00000 |
| 1/4"-28 | 1 19/64" | 33/64" | 1/32" | 0.254" | 1/4" | 2 | 0.098" | 1" | MS21060-4 | 000000000 | 00000 |
| 5/16"-24 | 1 1/64" | 37/64" | 7/64" | 0.317" | 7/32" | 2 | 0.13" | 23/32" | MS21076-5N | 000000000 | 00000 |
| 5/16"-24 | 1 19/64" | 39/64" | 3/64" | 0.317" | 9/32" | 2 | 0.13" | 1" | MS21060-5 | 000000000 | 00000 |
| 3/8"-24 | 1 19/64" | 43/64" | 1/16" | 0.379" | 19/64" | 2 | 0.13" | 1" | MS21060-6 | 000000000 | 00000 |