The Shaft,shouldered, cataloged under National Stock Number 3040-01-308-0725, 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 8 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 3040-01-308-0725 |
| Primary Part Number | 709-6129491 ITEM 20 |
| Item Name | Shaft,shouldered |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Surface Finish | 63.0 MICROINCHES |
| Step Quantity | 4 |
| First End Diameter | 0.7480 INCHES NOMINAL IN |
| Largest Step Diameter | 1.041 INCHES NOMINAL IN |
| First End Style | PLAIN |
| Material Document and Classification | QQ-N-281,CLASS A,FORM 1 FED SPEC ALL MATERIAL RESPONSES |
| 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 |
|---|---|
| 709-6129491 ITEM 20 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 36-05-7820 | 5/2 Secondary reference U.S. Government activity |
| 87832-1608A ITEM 20 | 5/9 Secondary reference U.S. Government activity |
| 709-6129491 | D/9 Drawing number reference only Naval Sea Systems Command |
| 6129491A-0020 | 3/2 Design control — primary reference U.S. Government activity |
NSN 3040-01-308-0725 is a Shaft,shouldered, manufactured by Naval Sea Systems Command, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
NSN 3040-01-308-0725 has 1 manufacturer part number on file: 709-6129491 ITEM 20 (Naval Sea Systems Command).
2 possible matches (shared part number, not a government interchangeability claim): 3020-01-309-1037, 5365-01-471-8402. Verify interchangeability with system specifications before substitution.
Key specifications for 709-6129491 ITEM 20: Surface Finish: 63.0 MICROINCHES; Step Quantity: 4; First End Diameter: 0.7480 INCHES NOMINAL IN; Largest Step Diameter: 1.041 INCHES NOMINAL 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.