The Worm Shaft, cataloged under National Stock Number 3040-00-830-4991, is classified within Federal Supply Class 3040 (Miscellaneous Power Transmission Equipment) of the Mechanical Power Transmission Equipment group. Government technical data includes 24 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 3040-00-830-4991 |
| Item Name | Worm Shaft |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Status | ACTIVE |
| Shaft Location | BOTH ENDS OF WORM |
| Involute Spline Pitch Diameter | 0.2500 INCHES NOMINAL SECOND END SECOND PORTION IN |
| FSC Application Data | ACTUATOR,ELECTRO-MECHANICAL,AIRCRAFT |
| Teeth Hardness Rating | 47.000 ROCKWELL C MINIMUM AND 53.000 ROCKWELL C MAXIMUM |
| Worm Body Length | 1.187 INCHES NOMINAL IN |
| Worm Thread Lead | 0.19796 INCHES NOMINAL IN |
| Worm Pitch Diameter | 0.49018 INCHES NOMINAL IN |
| Worm Outside Diameter | 0.552 INCHES NOMINAL IN |
| Straight Unthreaded Section Diameter | 0.3147 INCHES NOMINAL FIRST END FIRST PORTION IN |
| Straight Unthreaded Section Diameter | 0.3147 INCHES NOMINAL SECOND END FIRST PORTION IN |
| End Similarity | NOT IDENTICAL |
| Shaft Hardness Rating | 47.000 ROCKWELL C MINIMUM AND 53.000 ROCKWELL C MAXIMUM LOCATION NOT OTHERWISE SPECIFIED |
| Involute Spline Length | 0.500 INCHES NOMINAL SECOND END SECOND PORTION IN |
| Worm Thread Section Length | 0.625 INCHES NOMINAL IN |
| Involute Spline Pressure Angle in Deg | 14.5 SECOND END SECOND PORTION |
| Worm Helix Angle | 7 DEG 18 MIN 59 SEC |
| Material | STEEL |
| Worm Thread Quantity | 2 |
| Worm Thread Direction | RIGHT-HAND |
| Involute Spline Quantity | 12 SECOND END SECOND PORTION |
| Worm Pressure Angle in Deg | 20.000 |
| Worm Body Tapered Bearing Surface End | NOT PROVIDED |
| Straight Unthreaded Length | 0.256 INCHES NOMINAL FIRST END FIRST PORTION IN |
| Straight Unthreaded Length | 0.381 INCHES NOMINAL SECOND END FIRST PORTION IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 104830-01 | C/1 Advisory reference — outside the item-of-supply concept Safran Power Usa Llc |
| 104830-01 | 3/9 Design control — primary reference Lucas Aerospace Power Equipment Corporation |
NSN 3040-00-830-4991 is a Worm Shaft, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 5340-01-201-5394. Verify interchangeability with system specifications before substitution.
Key specifications for 3040-00-830-4991: Shaft Location: BOTH ENDS OF WORM; Involute Spline Pitch Diameter: 0.2500 INCHES NOMINAL SECOND END SECOND PORTION IN; FSC Application Data: ACTUATOR,ELECTRO-MECHANICAL,AIRCRAFT; Teeth Hardness Rating: 47.000 ROCKWELL C MINIMUM AND 53.000 ROCKWELL C MAXIMUM. 24 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 3040-00-830-4991 has DEMIL Code B. 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.