The Shaft,shouldered, cataloged under National Stock Number 3040-00-451-0334, is classified within Federal Supply Class 3040 (Miscellaneous Power Transmission Equipment) of the Mechanical Power Transmission Equipment group. The manufacturer of record is Fmc Corp. Government technical data includes 21 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 3040-00-451-0334 |
| Primary Part Number | 2587664 |
| Item Name | Shaft,shouldered |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Manufacturer | Fmc Corp |
| Status | ACTIVE |
| Surface Finish | 63.0 MICROINCHES |
| Step Quantity | 3 |
| First End Diameter | 1.2471 INCHES NOMINAL IN |
| First End Spline Major Diameter | 1.3940 INCHES NOMINAL IN |
| Second End Diameter | 1.2471 INCHES NOMINAL IN |
| Largest Step Diameter | 1.3940 INCHES NOMINAL IN |
| Second End Spline Minor Diameter | 1.2220 INCHES NOMINAL IN |
| First End Style | SPLINED (STRAIGHT) |
| Second End Spline Major Diameter | 1.3940 INCHES NOMINAL IN |
| Second End Groove Diameter | 1.0300 INCHES NOMINAL IN |
| First End Spline Length | 1.4400 INCHES NOMINAL IN |
| First End Spline Quantity | 16 |
| End Similarity | NOT IDENTICAL |
| Second End Spline Quantity | 12 |
| Second End Groove Width | 0.0750 INCHES NOMINAL IN |
| Second End Distance From End to Groove | 0.1190 INCHES NOMINAL IN |
| Second End Style | CIRCULAR GROOVED, SPLINED (STRAIGHT) AND EXTERNALLY THREADED |
| First End Spline Minor Diameter | 1.2220 INCHES NOMINAL IN |
| Material | STEEL COMP 4140 |
| Second End Internal Thread Length | 0.750 INCHES NOMINAL IN |
| Second End Spline Length | 1.1900 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 2587664 PRIMARY | Fmc Corp (USA) |
| Reference | Meaning |
|---|---|
| 2587664 | 5/2 Secondary reference U.S. Government activity |
NSN 3040-00-451-0334 is a Shaft,shouldered, manufactured by Fmc Corp, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
NSN 3040-00-451-0334 has 1 manufacturer part number on file: 2587664 (Fmc Corp).
1 possible match (shared part number, not a government interchangeability claim): 2530-01-363-8179. Verify interchangeability with system specifications before substitution.
Key specifications for 2587664: Surface Finish: 63.0 MICROINCHES; Step Quantity: 3; First End Diameter: 1.2471 INCHES NOMINAL IN; First End Spline Major Diameter: 1.3940 INCHES NOMINAL IN. 21 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.
NSN 3040-00-451-0334 has DEMIL Code B. Demilitarization may be required before disposal or transfer to non-military entities.
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.