The Extension Shaft, cataloged under National Stock Number 3040-01-499-5979, 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 9 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 3040-01-499-5979 |
| Primary Part Number | 752-7068459-83 |
| Item Name | Extension Shaft |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Internal Thread Length | 1.380 INCHES NOMINAL IN |
| Shaft End Design | FEMALE |
| Setscrew Hole Quantity | 2 |
| Screw Drive Type | SQUARE SOCKET |
| Bore Diameter | 1.550 INCHES MINIMUM AND 1.750 INCHES MAXIMUM IN |
| Material | ALUMINUM ALLOY |
| End Type | INTEGRAL COUPLING |
| Shaft End Configuration | ROUND |
| Attachment Method | SQUARE HOLES |
| 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 |
|---|---|
| 752-7068459-83 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| H832-1633-83 | 5/2 Secondary reference U.S. Government activity |
| 7068459 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 3040-01-499-5979 is a Extension Shaft, manufactured by Naval Sea Systems Command, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
NSN 3040-01-499-5979 has 1 manufacturer part number on file: 752-7068459-83 (Naval Sea Systems Command).
3 possible matches (shared part number, not a government interchangeability claim): 3040-01-499-5980, 3040-01-499-6042, 5340-01-500-5627. Verify interchangeability with system specifications before substitution.
Key specifications for 752-7068459-83: Internal Thread Length: 1.380 INCHES NOMINAL IN; Shaft End Design: FEMALE; Setscrew Hole Quantity: 2; Special Features: DWG NAME, WEAPONS HANDLING HOIST PLATFORM AND LOCKS ASSY; MATL CAGE/PN, 81346/ASTM-8150. 9 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.