The Gearshaft,spur, cataloged under National Stock Number 3040-01-434-7838, is classified within Federal Supply Class 3040 (Miscellaneous Power Transmission Equipment) of the Mechanical Power Transmission Equipment group. Government technical data includes 14 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 3040-01-434-7838 |
| Item Name | Gearshaft,spur |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Status | ACTIVE |
| Shaft Type | SHOULDERED |
| Shaft Material | STEEL COMP 322 |
| Shaft Largest Diameter | 1.5749 INCHES NOMINAL IN |
| Shaft End Size | 0.9900 INCHES IN |
| Teeth Quantity | 16 |
| Diametral Pitch | 4 |
| Gear Outside Diameter | 4.495 INCHES NOMINAL IN |
| Longer Shaft Segment Length | 7.1150 INCHES NOMINAL IN |
| Hardness Rating | 58.0 ROCKWELL C MINIMUM AND 62.0 ROCKWELL C MAXIMUM TEETH |
| Gear Material | STEEL COMP 322 |
| Shaft End Type | SPLINED STRAIGHT |
| Gear Location on Shaft | OFF CENTER BETWEEN ENDS OF SHAFT |
| Pressure Angle | 20.0000 DEGREES |
| Face Width | 2.0000 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 |
| Reference | Meaning |
|---|---|
| 117832 | 5/2 Secondary reference U.S. Government activity |
| C554AX107 | 3/2 Design control — primary reference U.S. Government activity |
| H554AX001 FIND NO. 106 | 5/2 Secondary reference U.S. Government activity |
| H554AX001 | D/9 Drawing number reference only U.S. Government activity |
NSN 3040-01-434-7838 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): 6515-01-444-7620. Verify interchangeability with system specifications before substitution.
Key specifications for 3040-01-434-7838: Shaft Type: SHOULDERED; Shaft Material: STEEL COMP 322; Shaft Largest Diameter: 1.5749 INCHES NOMINAL IN; Shaft End Size: 0.9900 INCHES IN. 14 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.