nuts › self-locking hexagon nuts
MS21045-4E
Military Standard Locknut
Description
Thread Size: 1/4", Nut Height: 1/4", Head Width: 3/8"
Specifications
| Bearing Surface Type | Chamfered or washer faced |
|---|---|
| Countersink Angle | 88.0 degrees nominal nut |
| Locking Feature | Prevailing torque all metal design |
| Lubrication | Soluble lubricant |
| Material | Steel |
| Nut Height | 0.208 inches minimum and 0.328 inches maximum |
| Nut Style | Hexagon |
| Special Features | Elliptical lock |
| Surface Treatment | Cadmium and chromate |
| Surface Treatment Specification | Qq-p-416, ty2, cl2 fed spec single treatment response |
| Temperature Rating | 450.0 deg fahrenheit |
| Thread Class | 3b |
| Thread Direction | Right-hand |
| Thread Qty | 28 |
| Thread Qty Per Inch (tpi) | 28 |
| Thread Series | UNJF |
| Thread Size | 0.250 |
| Width Across Flats | 0.430 inches minimum and 0.439 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.
- MS20500-428 MS 1/4-28 · CRES
- MS21045-4 MS 1/4-28 · Steel
- MS21045-4S MS 1/4-28 · Steel
- MS21045C4 MS 1/4-28 · CRES
- 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