The Shaft,shouldered, cataloged under National Stock Number 3040-01-500-7923, 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 18 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3040-01-500-7923 |
| Primary Part Number | 501-7066646-10 |
| Item Name | Shaft,shouldered |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES |
| Second End External Thread Length | 1.290 INCHES NOMINAL IN |
| Step Quantity | 5 |
| First End Diameter | 0.7480 INCHES MINIMUM AND 0.7490 INCHES MAXIMUM IN |
| First End Spline Major Diameter | 0.7470 INCHES MINIMUM AND 0.7480 INCHES MAXIMUM IN |
| Second End Diameter | 0.5620 INCHES NOMINAL IN |
| Largest Step Diameter | 1.125 INCHES NOMINAL IN |
| First End Style | SPLINED (STRAIGHT) |
| Material Document and Classification | QQ-N-286 FORM 2 CONDITION ANNEALED(COLD DRAWN) & AGE HARDENED FED SPEC SINGLE MATERIAL RESPONSE |
| Second End Groove Diameter | 0.4500 INCHES NOMINAL IN |
| First End Spline Length | 1.190 INCHES MINIMUM IN |
| First End Spline Quantity | 10 |
| End Similarity | NOT IDENTICAL |
| Second End Groove Width | 0.1200 INCHES NOMINAL IN |
| Second End Distance From End to Groove | 1.290 INCHES NOMINAL IN |
| Second End Style | CIRCULAR GROOVED AND EXTERNALLY THREADED |
| First End Spline Minor Diameter | 0.6290 INCHES MINIMUM AND 0.6390 INCHES MAXIMUM IN |
| Material | NICKEL ALLOY K-500 |
| 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 |
|---|---|
| 501-7066646-10 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| H525-7608-10 | 5/2 Secondary reference U.S. Government activity |
| 501-7066646 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 3040-01-500-7923 is a Shaft,shouldered, manufactured by Naval Sea Systems Command, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
NSN 3040-01-500-7923 has 1 manufacturer part number on file: 501-7066646-10 (Naval Sea Systems Command).
1 possible match (shared part number, not a government interchangeability claim): 5365-01-500-7967. Verify interchangeability with system specifications before substitution.
Key specifications for 501-7066646-10: Surface Finish: 32.0 MICROINCHES; Second End External Thread Length: 1.290 INCHES NOMINAL IN; Step Quantity: 5; First End Diameter: 0.7480 INCHES MINIMUM AND 0.7490 INCHES MAXIMUM IN. 18 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.