The Shaft,shouldered, cataloged under National Stock Number 3040-01-494-8568, 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 11 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 3040-01-494-8568 |
| Primary Part Number | 551-7068554-4 |
| Item Name | Shaft,shouldered |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Second End External Thread Length | 0.8000 INCHES NOMINAL IN |
| Step Quantity | 9 |
| First End Diameter | 0.2500 INCHES NOMINAL IN |
| Second End Diameter | 0.4380 INCHES NOMINAL IN |
| Largest Step Diameter | 1.988 INCHES MINIMUM AND 1.989 INCHES MAXIMUM IN |
| First End External Thread Length | 0.4200 INCHES NOMINAL IN |
| First End Style | EXTERNAL THREADED |
| Material Document and Classification | QQ-N-281, CLASS A, FORM 1 HF FED SPEC SINGLE MATERIAL RESPONSE |
| End Similarity | NOT IDENTICAL |
| Second End Style | EXTERNAL THREADED |
| 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 |
|---|---|
| 551-7068554-4 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| H845-1801-4 | 5/2 Secondary reference U.S. Government activity |
| 551-7068554 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 3040-01-494-8568 is a Shaft,shouldered, manufactured by Naval Sea Systems Command, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
NSN 3040-01-494-8568 has 1 manufacturer part number on file: 551-7068554-4 (Naval Sea Systems Command).
1 possible match (shared part number, not a government interchangeability claim): 3040-01-708-7351. Verify interchangeability with system specifications before substitution.
Key specifications for 551-7068554-4: Second End External Thread Length: 0.8000 INCHES NOMINAL IN; Step Quantity: 9; First End Diameter: 0.2500 INCHES NOMINAL IN; Second End Diameter: 0.4380 INCHES NOMINAL IN. 11 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.