The Shaft,shouldered, cataloged under National Stock Number 3040-01-145-5581, is classified within Federal Supply Class 3040 (Miscellaneous Power Transmission Equipment) of the Mechanical Power Transmission Equipment group. Government technical data includes 13 specifications, cited from the U.S. Government catalog. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government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 | 3040-01-145-5581 |
| Item Name | Shaft,shouldered |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Status | ACTIVE |
| Surface Finish | 63.0 MICROINCHES |
| Step Quantity | 5 |
| First End Diameter | 0.6250 INCHES NOMINAL IN |
| Second End Diameter | 2.0000 INCHES NOMINAL IN |
| Second End Step Length | 0.380 INCHES NOMINAL IN |
| Largest Step Diameter | 2.000 INCHES NOMINAL IN |
| First End External Thread Length | 0.790 INCHES NOMINAL IN |
| First End Style | EXTERNAL THREADED |
| Second End Angle Between Flats | 180.0 DEGREES NOMINAL |
| Material Document and Classification | QQ-N-286,CLASS A FED SPEC SINGLE MATERIAL RESPONSE |
| End Similarity | NOT IDENTICAL |
| Second End Style | TWO FLATS |
| 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 |
| Reference | Meaning |
|---|---|
| 87534-3704 ITEM 2 | 5/9 Secondary reference Drw Mfg Co |
| 87539-3704 ITEM 2 | 3/2 Design control — primary reference U.S. Government activity |
| 600-4789341 ITEM 2 | 5/2 Secondary reference U.S. Government activity |
| 600-4789341 | D/9 Drawing number reference only U.S. Government activity |
| 600-4789163 ITEM 2 | 3/2 Design control — primary reference U.S. Government activity |
| 87539-3704 | D/9 Drawing number reference only U.S. Government activity |
| 600-4789163 | D/9 Drawing number reference only U.S. Government activity |
NSN 3040-01-145-5581 is a Shaft,shouldered, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
5 possible matches (shared part number, not a government interchangeability claim): 3040-01-145-5582, 3040-01-145-5583, 3950-01-145-7668. Verify interchangeability with system specifications before substitution.
Key specifications for 3040-01-145-5581: Surface Finish: 63.0 MICROINCHES; Step Quantity: 5; First End Diameter: 0.6250 INCHES NOMINAL IN; Second End Diameter: 2.0000 INCHES NOMINAL IN. 13 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.