The Shaft,shouldered, cataloged under National Stock Number 3040-01-253-9423, is classified within Federal Supply Class 3040 (Miscellaneous Power Transmission Equipment) of the Mechanical Power Transmission Equipment group. Government technical data includes 8 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 3040-01-253-9423 |
| Item Name | Shaft,shouldered |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Status | ACTIVE |
| First End Width Across Flats | 0.290 INCHES MINIMUM AND 0.310 INCHES MAXIMUM IN |
| Step Quantity | 3 |
| First End Diameter | 0.3900 INCHES MINIMUM AND 0.4100 INCHES MAXIMUM IN |
| Largest Step Diameter | 0.390 INCHES MINIMUM AND 0.410 INCHES MAXIMUM IN |
| First End Style | SQUARE (ROUND CORNERS) |
| Material Document and Classification | QQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE |
| End Similarity | IDENTICAL |
| Material | STEEL COMP 304 |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| SS-472-2477292-53 | 3/9 Design control — primary reference Naval Ship Engineering Center Philadelphia Division Submarine Antenna Quality Assurance |
| SS-472-2477292 | D/9 Drawing number reference only Naval Ship Engineering Center Philadelphia Division Submarine Antenna Quality Assurance |
NSN 3040-01-253-9423 is a Shaft,shouldered, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 3040-01-253-9426, 3040-01-288-5310. Verify interchangeability with system specifications before substitution.
Key specifications for 3040-01-253-9423: First End Width Across Flats: 0.290 INCHES MINIMUM AND 0.310 INCHES MAXIMUM IN; Step Quantity: 3; First End Diameter: 0.3900 INCHES MINIMUM AND 0.4100 INCHES MAXIMUM IN; Largest Step Diameter: 0.390 INCHES MINIMUM AND 0.410 INCHES MAXIMUM IN. 8 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.