fittings › tube fitting locknuts
AN6289-4
Aeronautical Standard Tube Fitting Locknut
Description
Tube Fitting Nut
Specifications
| Dimension A | 0.688 in |
|---|---|
| Dimension B | 9/32 in |
| Dimension F | 0.79 in |
| End Application | Grumman a10 aircraft; chinook helicopter ch-47 |
| Industry Standards/Certification | AN6289 |
| Material | Steel |
| Material Specification | Comp 1141 federal specification single material response qq-s-637 |
| NIIN | 00-277-6372 |
| NSN | 4730-00-277-6372 |
| Nut Height | 0.281 |
| Nut Style | Tube fitting locknut |
| Specification Data | 88044-an6289 government standard |
| Surface Treatment | Cadmium |
| Surface Treatment Specification | Class 2 federal specification single treatment response type 2 qq-p-416 |
| Thread Class | 3b |
| Thread Direction | Right-hand |
| Thread Qty | 20 |
| Thread Qty Per Inch (tpi) | 20 |
| Thread Series | Unf (fine thread) |
| Thread Size | 0.438 |
| Thread T (Reference) | 7/16-20 |
| Tube Outside Diameter | 1/4 in |
| Weight | 0.02 lb |
| Width Across Flats | 0.688 |
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.
Looking for a specific part? Use the cross-reference lookup.
Catalog data updated 2026-07-05. Report a data error