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MS21921-5D
Military Standard Tube Coupling Nut
Description
Nut
Specifications
| Diameter C Tolerance | -000 in |
|---|---|
| Dimension A | 0.76 in |
| Dimension A Tolerance | +0.010 in |
| Dimension B | 0.18 in |
| Dimension B Tolerance | +0.010 in |
| Dimension C | 0.615 in |
| Dimension H | 5/8 in |
| End Application | Ah-1s(mc) used on attack helicopter |
| Industry Standards/Certification | MIL-S-8879 |
| Material | Aluminum |
| Material Specification | T6 federal specification single material response qq-a-225/6 |
| NIIN | 00-555-8012 |
| NSN | 4730-00-555-8012 |
| Nut Height | 0.760 |
| Nut Style | Tube coupling |
| Seat Angle | 45.00 degrees |
| Specification Data | 96906-ms21921 government standard |
| Surface Treatment | Anodize |
| Thread Class | 3b |
| Thread Direction | Right-hand |
| Thread Qty | 20 |
| Thread Qty Per Inch (tpi) | 20 |
| Thread Series | Unjf (fine thread with external controlled root radius) |
| Thread Size | 0.500 |
| Thread T (MIL-S-8879) | 0.5000-20 |
| Tube Outside Diameter | 5/16 in |
| Weight | 0.01 lb |
| Width Across Flats | 0.625 |
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.
- MS21921-5 MS 1/2-20 · Steel
- MS21921-5J MS 1/2-20 · CRES
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Catalog data updated 2026-07-05. Report a data error