The Worm Shaft, cataloged under National Stock Number 3040-00-694-8030, is classified within Federal Supply Class 3040 (Miscellaneous Power Transmission Equipment) of the Mechanical Power Transmission Equipment group. The manufacturer of record is Eaton Aerospace Llc Dba Eaton Inoac Div Fuel & Motion Control Systems Division. Government technical data includes 29 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 3040-00-694-8030 |
| Primary Part Number | A3400 |
| Item Name | Worm Shaft |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Manufacturer | Eaton Aerospace Llc Dba Eaton Inoac Div Fuel & Motion Control Systems Division |
| Status | ACTIVE |
| Shaft Location | BOTH ENDS OF WORM |
| Involute Spline Pitch Diameter | 0.2480 INCHES NOMINAL SECOND END THIRD PORTION IN |
| FSC Application Data | ACTUATOR,ELECTRO-MECHANICAL ROTARY |
| Teeth Hardness Rating | 30.0 ROCKWELL C MINIMUM AND 35.0 ROCKWELL C MAXIMUM |
| Worm Body Length | 1.234 INCHES NOMINAL IN |
| Worm Thread Lead | 0.131 INCHES NOMINAL IN |
| Thread Length | 0.281 INCHES NOMINAL SECOND END SECOND PORTION IN |
| Worm Pitch Diameter | 0.500 INCHES NOMINAL IN |
| Worm Outside Diameter | 0.583 INCHES NOMINAL IN |
| Straight Unthreaded Section Diameter | 0.2502 INCHES NOMINAL FIRST END SECOND PORTION IN |
| Straight Unthreaded Section Diameter | 0.312 INCHES NOMINAL FIRST END FIRST PORTION IN |
| Straight Unthreaded Section Diameter | 0.3752 INCHES NOMINAL SECOND END FIRST PORTION IN |
| Unthreaded Section Keyway Depth | 0.075 INCHES NOMINAL FIRST END SECOND PORTION IN |
| End Similarity | NOT IDENTICAL |
| Shaft Hardness Rating | 30.0 ROCKWELL C MINIMUM AND 35.0 ROCKWELL C MAXIMUM LOCATION NOT OTHERWISE SPECIFIED |
| Involute Spline Length | 0.593 INCHES NOMINAL SECOND END THIRD PORTION IN |
| Screw Thread Series Designator | UNF SECOND END SECOND PORTION |
| Worm Thread Section Length | 0.875 INCHES NOMINAL IN |
| Shaft Thread Direction | RIGHT-HAND SECOND END SECOND PORTION |
| Involute Spline Pressure Angle in Deg | 14.5 FIRST END |
| Worm Helix Angle | 4 DEG 46 MIN |
| Material | STEEL |
| Worm Thread Quantity | 1 |
| Worm Thread Direction | RIGHT-HAND |
| Involute Spline Quantity | 12 FIRST END |
| Unthreaded Section Keyway Width | 0.0625 INCHES NOMINAL FIRST END SECOND PORTION IN |
| Threaded Section Pin Hole Diameter | 0.070 INCHES NOMINAL SECOND END SECOND PORTION IN |
| Worm Pressure Angle in Deg | 14.500 |
| Worm Body Tapered Bearing Surface End | NOT PROVIDED |
| 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 |
|---|---|
| A3400 PRIMARY | Eaton Aerospace Llc Dba Eaton Inoac Div Fuel & Motion Control Systems Division (USA) |
| Reference | Meaning |
|---|---|
| A3400 | 5/9 Secondary reference Eaton Motor Site |
NSN 3040-00-694-8030 is a Worm Shaft, manufactured by Eaton Aerospace Llc Dba Eaton Inoac Div Fuel & Motion Control Systems Division, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
NSN 3040-00-694-8030 has 1 manufacturer part number on file: A3400 (Eaton Aerospace Llc Dba Eaton Inoac Div Fuel & Motion Control Systems Division).
2 possible matches (shared part number, not a government interchangeability claim): 5975-01-319-8084, 3010-01-449-4603. Verify interchangeability with system specifications before substitution.
Key specifications for A3400: Shaft Location: BOTH ENDS OF WORM; Involute Spline Pitch Diameter: 0.2480 INCHES NOMINAL SECOND END THIRD PORTION IN; FSC Application Data: ACTUATOR,ELECTRO-MECHANICAL ROTARY; Teeth Hardness Rating: 30.0 ROCKWELL C MINIMUM AND 35.0 ROCKWELL C MAXIMUM. 29 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.