The Shaft,shouldered, cataloged under National Stock Number 3040-01-185-2394, is classified within Federal Supply Class 3040 (Miscellaneous Power Transmission Equipment) of the Mechanical Power Transmission Equipment group. Government technical data includes 11 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 3040-01-185-2394 |
| Item Name | Shaft,shouldered |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Status | ACTIVE |
| Surface Finish | 125.0 MICROINCHES |
| Step Quantity | 7 |
| First End Diameter | 3.5000 INCHES NOMINAL IN |
| Second End Diameter | 4.0000 INCHES NOMINAL IN |
| Largest Step Diameter | 4.000 INCHES NOMINAL IN |
| First End Style | PLAIN |
| Material Document and Classification | AISI 4150 ASSN STD SINGLE MATERIAL RESPONSE |
| End Similarity | NOT IDENTICAL |
| Second End Style | INTERNAL THREADED |
| Material | STEEL COMP 4150 |
| Second End Internal Thread Length | 4.250 INCHES NOMINAL IN |
| 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 |
|---|---|
| 80118 | 3/9 Design control — primary reference Louis Allis Co the This Company Has Gone Bankrupt and Has Been Purchased by 3 Companies |
| 80118 | C/1 Advisory reference — outside the item-of-supply concept Hsi Electric, Inc. |
NSN 3040-01-185-2394 is a Shaft,shouldered, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 5180-01-594-6165. Verify interchangeability with system specifications before substitution.
Key specifications for 3040-01-185-2394: Surface Finish: 125.0 MICROINCHES; Step Quantity: 7; First End Diameter: 3.5000 INCHES NOMINAL IN; Second End Diameter: 4.0000 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.