The Gearshaft,spur, cataloged under National Stock Number 3040-00-511-9978, is classified within Federal Supply Class 3040 (Miscellaneous Power Transmission Equipment) of the Mechanical Power Transmission Equipment group. Government technical data includes 13 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 3040-00-511-9978 |
| Item Name | Gearshaft,spur |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Status | ACTIVE |
| Shaft Type | SHOULDERED |
| Shaft Material | STEEL CORROSION RESISTING |
| Shaft Largest Diameter | 0.625 INCHES NOMINAL IN |
| Shaft End Size | 0.625 INCHES AND 0.450 INCHES IN |
| Teeth Quantity | 79 |
| Diametral Pitch | 48 |
| Gear Outside Diameter | 1.688 INCHES NOMINAL IN |
| Longer Shaft Segment Length | 1.610 INCHES NOMINAL IN |
| Gear Material | STEEL CORROSION RESISTING |
| Shaft End Type | KEYWAY WOODRUFF AND PLAIN |
| Gear Location on Shaft | OFF CENTER BETWEEN ENDS OF SHAFT |
| Pressure Angle | 20.0000 DEGREES |
| Face Width | 0.750 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 708075 | D/9 Drawing number reference only U.S. Government activity |
| 708075-1 | 3/2 Design control — primary reference U.S. Government activity |
NSN 3040-00-511-9978 is a Gearshaft,spur, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 3020-01-134-8975. Verify interchangeability with system specifications before substitution.
Key specifications for 3040-00-511-9978: Shaft Type: SHOULDERED; Shaft Material: STEEL CORROSION RESISTING; Shaft Largest Diameter: 0.625 INCHES NOMINAL IN; Shaft End Size: 0.625 INCHES AND 0.450 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.
NSN 3040-00-511-9978 has DEMIL Code Q. 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.