nuts › self-locking hexagon nuts
MS21045-4S
Military Standard Locking Hexagon Nut Self
Description
1/4-28 thread - self-locking - regular height, cadmium plated steel nut, 450°,, without dry film lube, segmented beam lock
Specifications
| Bearing Surface Finish | 125.0 microinches |
|---|---|
| Bearing Surface Type | Chamfered or washer faced |
| Locking Feature | Prevailing torque all metal design |
| Lubrication | Soluble lubricant |
| Material | Steel |
| Material Specification | Astm a29 assn std 1st material response or ams 5050 assn std 2nd material response or ams 5060 assn std 3rd material response or ams 5069 assn std 4th material response or ams 5070 assn std 5th material response or ams 5080 assn std 5th material response or ams 5022 assn std 7th material response or ams 5024 assn std 8th material response or ams 5020 assn std 9th material response or ams 6322 assn std 10th material response |
| NIIN | 00-061-7325 |
| NSN | 5310-00-061-7325 |
| Nut Height | 0.240 inches minimum and 0.328 inches maximum |
| Surface Treatment | Cadmium |
| Surface Treatment Specification | Qq-p-416,type ii,class 2 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 |
| Weight | .005 lb |
| 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
Interchangeable
Parts that share a National Stock Number or are listed as an alternate for MS21045-4S — functionally equivalent.
- MS21045-4 Same NSN 1/4-28 · Steel
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
- MS21045-4E 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
Looking for a specific part? Use the cross-reference lookup.
Catalog data updated 2026-07-05. Report a data error