The Shaft,shouldered, cataloged under National Stock Number 3040-01-493-8979, 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 11 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3040-01-493-8979 |
| Primary Part Number | 596-7409743-20 |
| Item Name | Shaft,shouldered |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| First End Diameter | 1.2492 INCHES MINIMUM AND 1.2496 INCHES MAXIMUM IN |
| Second End Diameter | 1.4370 INCHES NOMINAL IN |
| First End Style | SPLINED (STRAIGHT) |
| Second End Spline Major Diameter | 1.5560 INCHES NOMINAL IN |
| Material Document and Classification | QQ-N-286 FED SPEC SINGLE MATERIAL RESPONSE |
| End Similarity | NOT IDENTICAL |
| Second End Spline Quantity | 22 |
| Second End Style | WOODRUFF KEYWAY |
| External Keyway Length | 3.000 INCHES MINIMUM AND 3.010 INCHES MAXIMUM FIRST END IN |
| Second End Spline Length | 2.500 INCHES NOMINAL IN |
| First End Keyway Width | 0.2500 INCHES MINIMUM AND 0.2520 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 |
|---|---|
| 596-7409743-20 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 596-7409743 | D/9 Drawing number reference only Naval Sea Systems Command |
| B831-6100-20 | 5/2 Secondary reference U.S. Government activity |
NSN 3040-01-493-8979 is a Shaft,shouldered, manufactured by Naval Sea Systems Command, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
NSN 3040-01-493-8979 has 1 manufacturer part number on file: 596-7409743-20 (Naval Sea Systems Command).
3 possible matches (shared part number, not a government interchangeability claim): 3040-01-493-9746, 3120-01-494-2320, 3120-01-494-2323. Verify interchangeability with system specifications before substitution.
Key specifications for 596-7409743-20: First End Diameter: 1.2492 INCHES MINIMUM AND 1.2496 INCHES MAXIMUM IN; Second End Diameter: 1.4370 INCHES NOMINAL IN; First End Style: SPLINED (STRAIGHT); Second End Spline Major Diameter: 1.5560 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.