The Shaft,shouldered, cataloged under National Stock Number 3040-01-496-1890, 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 20 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3040-01-496-1890 |
| Primary Part Number | 581-6985420-8 |
| Item Name | Shaft,shouldered |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Surface Finish | 63.0 MICROINCHES |
| First End Width Across Flats | 0.998 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN |
| Second End External Thread Length | 1.340 INCHES NOMINAL IN |
| Step Quantity | 6 |
| First End Diameter | 3.0000 INCHES NOMINAL IN |
| First End Step Length | 2.190 INCHES NOMINAL IN |
| Second End Diameter | 0.7500 INCHES NOMINAL IN |
| Largest Step Diameter | 3.000 INCHES NOMINAL IN |
| First End Style | SQUARE (ROUND CORNERS) |
| Second End Keyway Width | 0.3750 INCHES MINIMUM AND 0.3770 INCHES MAXIMUM IN |
| Material Document and Classification | QQ-N-286,FORM:2,CONDITION:ANNEALED&AGE HARDENED,FIN:B FED SPEC SINGLE MATERIAL RESPONSE |
| Second End Groove Diameter | 0.5900 INCHES NOMINAL IN |
| Second End Keyway Depth | 0.197 INCHES MINIMUM AND 0.213 INCHES MAXIMUM IN |
| Specification/standard Data | 81348-QQ-N-286,FORM:2,CONDITION:ANNEALED & AGE HARDENED,FINISH:B GOVERNMENT SPECIFICATION |
| End Similarity | NOT IDENTICAL |
| Second End Groove Width | 0.3000 INCHES NOMINAL IN |
| Second End Distance From End to Groove | 1.340 INCHES NOMINAL IN |
| Second End Style | CIRCULAR GROOVED FLAT KEYWAY AND EXTERNALLY THREADED |
| Material | NICKEL ALLOY |
| External Keyway Length | 2.125 INCHES MINIMUM AND 2.137 INCHES MAXIMUM 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 |
|---|---|
| 581-6985420-8 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 581-6985420 | D/9 Drawing number reference only Naval Sea Systems Command |
| H611-1404-8 | 5/2 Secondary reference U.S. Government activity |
| 218033192 | 5/2 Secondary reference U.S. Government activity |
NSN 3040-01-496-1890 is a Shaft,shouldered, manufactured by Naval Sea Systems Command, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
NSN 3040-01-496-1890 has 1 manufacturer part number on file: 581-6985420-8 (Naval Sea Systems Command).
Key specifications for 581-6985420-8: Surface Finish: 63.0 MICROINCHES; First End Width Across Flats: 0.998 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN; Second End External Thread Length: 1.340 INCHES NOMINAL IN; Step Quantity: 6. 20 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.