The Shaft,shouldered, cataloged under National Stock Number 3040-01-491-8540, 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 15 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3040-01-491-8540 |
| Primary Part Number | 124-4497994 PC 17 |
| Item Name | Shaft,shouldered |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| First End Width Across Flats | 2.172 INCHES NOMINAL IN |
| Step Quantity | 2 |
| First End Diameter | 2.1250 INCHES NOMINAL IN |
| First End Step Length | 2.250 INCHES NOMINAL IN |
| Second End Diameter | 2.5060 INCHES MINIMUM AND 2.5080 INCHES MAXIMUM IN |
| Second End Step Length | 16.000 INCHES NOMINAL IN |
| Largest Step Diameter | 2.506 INCHES MINIMUM AND 2.508 INCHES MAXIMUM IN |
| Second End Distance From Keyway Center to End | 2.125 INCHES NOMINAL IN |
| First End Style | HEXAGONAL |
| Second End Keyway Width | 0.6250 INCHES NOMINAL IN |
| Material Document and Classification | MIL-S-1222 MIL SPEC SINGLE MATERIAL RESPONSE |
| End Similarity | NOT IDENTICAL |
| Second End Style | WOODRUFF KEYWAY |
| Material | STEEL |
| External Keyway Length | 3.750 INCHES NOMINAL SECOND END IN |
| 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 |
|---|---|
| 124-4497994 PC 17 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 124-4497994 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 3040-01-491-8540 is a Shaft,shouldered, manufactured by Naval Sea Systems Command, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
NSN 3040-01-491-8540 has 1 manufacturer part number on file: 124-4497994 PC 17 (Naval Sea Systems Command).
Key specifications for 124-4497994 PC 17: First End Width Across Flats: 2.172 INCHES NOMINAL IN; Step Quantity: 2; First End Diameter: 2.1250 INCHES NOMINAL IN; First End Step Length: 2.250 INCHES NOMINAL IN. 15 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.