The Gearshaft,spur, cataloged under National Stock Number 3040-01-500-1978, 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 13 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government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 | 3040-01-500-1978 |
| Primary Part Number | 501-7066646-4 |
| Item Name | Gearshaft,spur |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Shaft Type | SHOULDERED |
| Shaft Material | STEEL COMP 4340 |
| Shaft Largest Diameter | 1.500 INCHES NOMINAL IN |
| Shaft End Size | 1.250 INCHES IN |
| Teeth Quantity | 16 |
| Diametral Pitch | 8 |
| Gear Outside Diameter | 2.250 INCHES NOMINAL IN |
| Longer Shaft Segment Length | 1.060 INCHES NOMINAL IN |
| Gear Material | STEEL COMP 4340 |
| Shaft End Type | SPLINED INVOLUTE, INTERNAL |
| Gear Location on Shaft | OFF CENTER BETWEEN ENDS OF SHAFT |
| Pressure Angle | 20.0000 DEGREES |
| Face Width | 1.130 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 |
|---|---|
| 501-7066646-4 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| H525-7608-4 | 5/2 Secondary reference U.S. Government activity |
| 501-7066646 | D/9 Drawing number reference only Naval Sea Systems Command |
| H525-7608 | D/9 Drawing number reference only U.S. Government activity |
NSN 3040-01-500-1978 is a Gearshaft,spur, manufactured by Naval Sea Systems Command, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
NSN 3040-01-500-1978 has 1 manufacturer part number on file: 501-7066646-4 (Naval Sea Systems Command).
5 possible matches (shared part number, not a government interchangeability claim): 3040-01-500-2095, 4820-01-500-3842, 3120-01-500-7914. Verify interchangeability with system specifications before substitution.
Key specifications for 501-7066646-4: Shaft Type: SHOULDERED; Shaft Material: STEEL COMP 4340; Shaft Largest Diameter: 1.500 INCHES NOMINAL IN; Shaft End Size: 1.250 INCHES IN. 13 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.