As listed
| Field | Value |
|---|---|
| Seller | Aircraft Spruce |
| Type | All-metal self-locking hex nut, reduced height |
| Temperature (listed) | Up to 450 °F |
| Versions | Dry, and dry-film lubed (dark grey) |
| Listing checked | 2026-09-30 |
Taken from Aircraft Spruce's product page on 2026-09-30. Where the listing does not state a figure, this table does not either.
What it is for
Spruce notes it is shorter than the AN363 but develops the same tensile strength. Where temperature is not the issue, the fiber-insert AN365 is the common choice.
Sizes listed
| Type | Part No. | Thread |
|---|---|---|
| Dry Hex Nut | 04-04060 | 4-40 |
| Dry Hex Nut | MS21042-06 | 6-32 |
| Dry Hex Nut | MS21042-08 | 8-32 |
| Dry Hex Nut | MS21042-3 | 10-32 |
| Dry Hex Nut | MS21042-4 | 1/4-28 |
| Dry Hex Nut | MS21042-5 | 5/16-24 |
| Dry Hex Nut | MS21042-6 | 3/8-24 |
| Lubed Hex Nut | MS21042-L04 | 4-40 |
| Lubed Hex Nut | MS21042-L06 | 6-32 |
| Lubed Hex Nut | MS21042-L08 | 8-32 |
| Lubed Hex Nut | MS21042-L3 | 10-32 |
| Lubed Hex Nut | MS21042-L4 | 1/4-28 |
| Lubed Hex Nut | MS21042-L5 | 5/16-24 |
| Lubed Hex Nut | MS21042-L6 | 3/8-24 |
As listed by Aircraft Spruce on 2026-09-30. Check the live listing before ordering: stock and part numbers change.
Where to buy
The link opens Aircraft Spruce's own page for this item, so the price and stock you see are theirs and current. We do not copy prices.
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Sources
- Aircraft Spruce — MS21042 All-Metal Hex Stop Nuts — product listing, checked 2026-09-30.