The Shaft,shouldered, cataloged under National Stock Number 3040-01-503-7500, 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 18 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 3040-01-503-7500 |
| Primary Part Number | 596-7410507-7 |
| Item Name | Shaft,shouldered |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Surface Finish | 16.0 MICROINCHES |
| Step Quantity | 7 |
| First End Diameter | 1.7500 INCHES NOMINAL IN |
| Second End Diameter | 1.9970 INCHES NOMINAL IN |
| Largest Step Diameter | 2.440 INCHES NOMINAL IN |
| Second End Spline Minor Diameter | 1.9970 INCHES NOMINAL IN |
| First End External Thread Length | 1.410 INCHES NOMINAL IN |
| First End Style | CIRCULAR GROOVED AND EXTERNALLY THREADED |
| Second End Spline Major Diameter | 1.7130 INCHES NOMINAL IN |
| Material Document and Classification | QQ-N-286, FORM-2, COND-ANL (CD); AH FED SPEC SINGLE MATERIAL RESPONSE |
| End Similarity | NOT IDENTICAL |
| First End Distance From End to Groove | 1.410 INCHES NOMINAL IN |
| Second End Spline Quantity | 10 |
| First End Groove Diameter | 1.6100 INCHES NOMINAL IN |
| Second End Style | SPLINED (STRAIGHT) |
| Material | NICKEL ALLOY K-500 |
| First End Groove Width | 0.1200 INCHES NOMINAL IN |
| Second End Spline Length | 2.120 INCHES NOMINAL 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 |
|---|---|
| 596-7410507-7 PRIMARY | Naval Sea Systems Command (USA) |
| 596-7410332-6 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| B434-5412-7 | 5/2 Secondary reference U.S. Government activity |
| 7410332 | D/9 Drawing number reference only Naval Sea Systems Command |
| B434-5410-6 | 5/2 Secondary reference U.S. Government activity |
| 7410507 | D/9 Drawing number reference only Naval Sea Systems Command |
| 596-7410507-12 | C/1 Advisory reference — outside the item-of-supply concept Naval Sea Systems Command |
NSN 3040-01-503-7500 is a Shaft,shouldered, manufactured by Naval Sea Systems Command, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
NSN 3040-01-503-7500 has 2 manufacturer part numbers on file: 596-7410507-7 (Naval Sea Systems Command), 596-7410332-6 (Naval Sea Systems Command).
1 possible match (shared part number, not a government interchangeability claim): 3040-01-504-0608. Verify interchangeability with system specifications before substitution.
Key specifications for 596-7410507-7: Surface Finish: 16.0 MICROINCHES; Step Quantity: 7; First End Diameter: 1.7500 INCHES NOMINAL IN; Second End Diameter: 1.9970 INCHES NOMINAL IN. 18 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.