The Shaft,shouldered, cataloged under National Stock Number 3040-01-194-7877, 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11 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 3040-01-194-7877 |
| Item Name | Shaft,shouldered |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Status | ACTIVE |
| Surface Finish | 125.0 MICROINCHES |
| Second End External Thread Length | 0.937 INCHES NOMINAL IN |
| Step Quantity | 3 |
| Second End Diameter | 0.1250 INCHES NOMINAL IN |
| Largest Step Diameter | 1.247 INCHES MINIMUM AND 1.248 INCHES MAXIMUM IN |
| First End Style | SPLINED (STRAIGHT) |
| Material Document and Classification | QQ-N-281 CLASS A FED SPEC SINGLE MATERIAL RESPONSE |
| First End Spline Length | 1.750 INCHES NOMINAL IN |
| End Similarity | NOT IDENTICAL |
| Second End Style | EXTERNAL THREADED |
| 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 |
|---|---|
| SSN637-501-2143875 | D/9 Drawing number reference only U.S. Government activity |
| 77643-74 X 2 PIECE 22 | 3/2 Design control — primary reference U.S. Government activity |
| SSN637-501-2143875 PIECE 22 | 5/2 Secondary reference U.S. Government activity |
| 77643-74 X 2 | D/9 Drawing number reference only U.S. Government activity |
NSN 3040-01-194-7877 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): 3040-01-194-7878. Verify interchangeability with system specifications before substitution.
Key specifications for 3040-01-194-7877: Surface Finish: 125.0 MICROINCHES; Second End External Thread Length: 0.937 INCHES NOMINAL IN; Step Quantity: 3; Second End Diameter: 0.1250 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.