nuts › self-locking hexagon nuts
MS21044C9
Military Standard Locking Hexagon Nut Self
Description
Thread Size: 1/2", Nut Height: 5/8", Head Width: 7/8", locknut, nylon insert, fine thread, soluble lubricant, MS21044 series nut
Specifications
| Bearing Surface Finish | 125.0 microinches |
|---|---|
| Bearing Surface Type | Chamfered or washer faced |
| Countersink Angle | 88.0 degrees nut |
| Locking Feature | Prevailing torque with nonmetallic insert |
| Lubrication | Soluble lubricant |
| Material | Steel |
| Material Specification | Ams 5688 assn standard 1st material response nut or ams 5640 assn standard 2nd material response nut or ams 5647 assn standard 3rd material response nut |
| Nut Height | Between 0.623 inches and 0.704 inches |
| Nut Style | Hexagon |
| Surface Treatment | Passivate except insert |
| Surface Treatment Specification | Qq-p-35 federal specification single treatment response except insert |
| Temperature Rating | 250.0 degrees fahrenheit |
| Thread Class | 3b |
| Thread Direction | Right-hand |
| Thread Qty Per Inch (tpi) | 18 |
| Thread Series | Unjf (fine thread with external controlled root radius) |
| Thread Size | 0.562 |
| Width Across Flats | Between 0.865 inches and 0.877 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.
- MS20500-918 MS 9/16-18 · Steel
- MS21044N9 MS 9/16-18 · Steel
- MS21045-9 MS 9/16-18 · Steel
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Catalog data updated 2026-07-05. Report a data error