The Shaft,shouldered, cataloged under National Stock Number 3040-01-444-4373, is classified within Federal Supply Class 3040 (Miscellaneous Power Transmission Equipment) of the Mechanical Power Transmission Equipment group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 9 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3040-01-444-4373 |
| Primary Part Number | 6405751 AHCA A9 |
| Item Name | Shaft,shouldered |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES |
| Step Quantity | 8 |
| First End Diameter | 1.0000 INCHES NOMINAL IN |
| Largest Step Diameter | 1.750 INCHES NOMINAL IN |
| First End Style | INTERNAL THREADED |
| First End Internal Thread Length | 1.120 INCHES NOMINAL IN |
| Material Document and Classification | QQ-N-286 FED SPEC SINGLE MATERIAL RESPONSE |
| End Similarity | IDENTICAL |
| Material | NICKEL ALLOY |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 6405751 AHCA A9 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 6111404-A9 | 5/9 Secondary reference Naval Sea Systems Command |
| DF2011-237 FIND AHCA A9 | 5/9 Secondary reference Huntington Ingalls Inc Div Newport News Shipbuilding |
| 581-6405751 FIND AHCA A9 | 3/9 Design control — primary reference Naval Sea Systems Command |
| 6405751 | D/9 Drawing number reference only Naval Sea Systems Command |
| C611-1404 FIND AHCA A9 | 5/9 Secondary reference U.S. Government activity |
NSN 3040-01-444-4373 is a Shaft,shouldered, manufactured by Naval Sea Systems Command, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
NSN 3040-01-444-4373 has 1 manufacturer part number on file: 6405751 AHCA A9 (Naval Sea Systems Command).
3 possible matches (shared part number, not a government interchangeability claim): 3040-01-450-3108, 3010-01-494-7397, 5365-01-495-2417. Verify interchangeability with system specifications before substitution.
Key specifications for 6405751 AHCA A9: Surface Finish: 32.0 MICROINCHES; Step Quantity: 8; First End Diameter: 1.0000 INCHES NOMINAL IN; Largest Step Diameter: 1.750 INCHES NOMINAL IN. 9 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.