The Shaft,shouldered, cataloged under National Stock Number 3040-01-377-7540, 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 16 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 3040-01-377-7540 |
| Primary Part Number | 752-5944481-3 |
| Item Name | Shaft,shouldered |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Second End External Thread Length | 0.635 INCHES NOMINAL IN |
| Step Quantity | 6 |
| First End Diameter | 1.7480 INCHES MINIMUM AND 1.7500 INCHES MAXIMUM IN |
| Second End Diameter | 2.0630 INCHES MINIMUM AND 2.0640 INCHES MAXIMUM IN |
| Largest Step Diameter | 2.440 INCHES NOMINAL IN |
| First End Style | FLAT KEYWAY |
| Second End Keyway Width | 0.5000 INCHES MINIMUM AND 0.5020 INCHES MAXIMUM IN |
| Material Document and Classification | MIL-S-6758,GR 4130,COND F MIL SPEC SINGLE MATERIAL RESPONSE |
| First End Keyway Depth | 0.208 INCHES MINIMUM AND 0.221 INCHES MAXIMUM IN |
| Second End Keyway Depth | 0.282 INCHES MINIMUM AND 0.296 INCHES MAXIMUM IN |
| End Similarity | NOT IDENTICAL |
| Second End Style | EXTERNALLY THREADED AND FLAT KEYWAY |
| Material | STEEL |
| External Keyway Length | 2.067 INCHES NOMINAL SECOND END IN |
| External Keyway Length | 2.440 INCHES NOMINAL FIRST END IN |
| First End Keyway Width | 0.3750 INCHES MINIMUM AND 0.3770 INCHES MAXIMUM 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 |
|---|---|
| 752-5944481-3 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 752-5944481 PIECE 3 | 5/9 Secondary reference Westinghouse Electric Corp Machinery Technology Div |
| 5944481 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 3040-01-377-7540 is a Shaft,shouldered, manufactured by Naval Sea Systems Command, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
NSN 3040-01-377-7540 has 1 manufacturer part number on file: 752-5944481-3 (Naval Sea Systems Command).
1 possible match (shared part number, not a government interchangeability claim): 3020-01-489-5539. Verify interchangeability with system specifications before substitution.
Key specifications for 752-5944481-3: Second End External Thread Length: 0.635 INCHES NOMINAL IN; Step Quantity: 6; First End Diameter: 1.7480 INCHES MINIMUM AND 1.7500 INCHES MAXIMUM IN; Second End Diameter: 2.0630 INCHES MINIMUM AND 2.0640 INCHES MAXIMUM IN. 16 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.