nuts › self-locking hexagon nuts
MS21045-08
Military Standard Locking Hexagon Nut Self
Description
Nut
Specifications
| Bearing Surface Finish | 125.0 microinches |
|---|---|
| Bearing Surface Type | Chamfered or washer faced |
| Countersink Angle | 88.0 degrees nominal nut |
| Features | Regular Height |
| Industry Standards/Certification | MS21045 |
| Locking Feature | Prevailing torque all metal design |
| Lubricant | Non-Dry Lubricant |
| Lubrication | Soluble lubricant |
| Material | Steel |
| Maximum Dimension A | 0.250 in |
| Maximum Dimension B | 0.345 in |
| Minimum Dimension A | 0.219 in |
| Minimum Dimension B | 0.336 in |
| Minimum Dimension C | 0.374 in |
| Minimum Dimension F | 0.091 in |
| NIIN | 00-889-2549 |
| NSN | 5310-00-889-2549 |
| Nut Height | 0.219 inches minimum and 0.250 inches maximum |
| Nut Style | Hexagon |
| Service Temperature | 450 ºF |
| Surface Treatment | Cadmium |
| Surface Treatment Specification | Qq-p-416,ty 2,cl 3 fed spec single treatment response |
| Temperature Rating | 450.0 deg fahrenheit |
| Thread Class | 3b |
| Thread Direction | Right-hand |
| Thread MIL-S-8879 | 0.1640-32 |
| Thread Qty | 32 |
| Thread Qty Per Inch (tpi) | 32 |
| Thread Series | UNJC |
| Thread Size | 0.164, 8-32 |
| Type | Self-Locking Nut |
| Weight | 0.0041 lb |
| Width Across Flats | 0.336 inches minimum and 0.345 inches maximum |
Other sizes
Parts that share this base number, ordered by size. Always verify the full specification before substituting.
Cross-reference
Similar parts
Parts with matching key dimensions — often from a different standards family. Candidates for comparison only; verify the full specification before substituting.
- MS21045-08E MS #8-32 · Steel
- MS21045C08 MS #8-32 · CRES
- MS21046C08 MS #8-32 · CRES
- MS21046C08E MS #8-32 · Steel
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Catalog data updated 2026-07-05. Report a data error