nuts › self-locking hexagon nuts
MS21045C4
Military Standard Locking Hexagon Nut Self
Description
Nut
Specifications
| Counterbore Diameter | 0.253 inches and 0.293 inches |
|---|---|
| Countersink Angle | 88 degrees |
| Locking Feature | Prevailing torque all metal design |
| Lubrication | Dry film lubricant |
| Material | CRES |
| NIIN | 00-982-4988 |
| NSN | 5310-00-982-4988 |
| Nut Height | Between 0.240 inches and 0.328 inches |
| Nut Style | Hexagon |
| Surface Finish | 125.0 microinches |
| Temperature Rating | 450 degrees fahrenheit |
| Thread Class | 3b |
| Thread Direction | Right-hand |
| Thread Qty Per Inch (tpi) | 28 |
| Thread Series | Unf (fine thread) |
| Thread Size | 0.250 |
| Weight | .005 lb |
| Width Across Flats | Between 0.430 inches and 0.439 inches |
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.
- MS20500-428 MS 1/4-28 · CRES
- MS21045-4 MS 1/4-28 · Steel
- MS21045-4E MS 1/4-28 · Steel
- MS21045-4S MS 1/4-28 · Steel
- MS21046C4 MS 1/4-28 · CRES
- MS21046C4E MS 1/4-28 · CRES
- MS21046C4S MS 1/4-28 · CRES
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Catalog data updated 2026-07-05. Report a data error