The Shaft,shouldered, cataloged under National Stock Number 3040-01-389-4204, 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 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 3040-01-389-4204 |
| Primary Part Number | SK-F-8530-8 |
| Item Name | Shaft,shouldered |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Step Quantity | 3 |
| First End Diameter | 0.7475 INCHES NOMINAL IN |
| Largest Step Diameter | 0.7475 INCHES NOMINAL IN |
| First End Distance From End to Flat | 0.2812 INCHES NOMINAL IN |
| First End Style | FLAT GROOVED |
| First End Grooved Flat Depth | 0.2163 INCHES NOMINAL IN |
| End Similarity | IDENTICAL |
| First End Grooved Flat Length | 0.3125 INCHES NOMINAL IN |
| Material | STEEL CORROSION RESISTING |
| 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 |
|---|---|
| 803-6397416 PIECE 13 | Naval Sea Systems Command (USA) |
| SK-F-8530 PIECE 8 | Naval Sea Systems Command (USA) |
| SK-F-8530-8 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| SK-F-8530 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 3040-01-389-4204 is a Shaft,shouldered, manufactured by Naval Sea Systems Command, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
NSN 3040-01-389-4204 has 3 manufacturer part numbers on file: 803-6397416 PIECE 13 (Naval Sea Systems Command), SK-F-8530 PIECE 8 (Naval Sea Systems Command), SK-F-8530-8 (Naval Sea Systems Command).
2 possible matches (shared part number, not a government interchangeability claim): 3040-01-389-4242, 3960-01-439-7498. Verify interchangeability with system specifications before substitution.
Key specifications for SK-F-8530-8: Step Quantity: 3; First End Diameter: 0.7475 INCHES NOMINAL IN; Largest Step Diameter: 0.7475 INCHES NOMINAL IN; First End Distance From End to Flat: 0.2812 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.