The Worm Shaft, cataloged under National Stock Number 3040-01-444-5460, 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 20 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 3040-01-444-5460 |
| Primary Part Number | 752-6406839-79 |
| Item Name | Worm Shaft |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Shaft Location | BOTH ENDS OF WORM |
| Worm Thread Lead | 12.800 INCHES NOMINAL IN |
| Thread Length | 0.380 INCHES NOMINAL FIRST END FIRST PORTION IN |
| Worm Outside Diameter | 0.530 INCHES NOMINAL IN |
| Straight Unthreaded Section Diameter | 0.410 INCHES NOMINAL SECOND END THIRD PORTION IN |
| Straight Unthreaded Section Diameter | 0.530 INCHES NOMINAL SECOND END SECOND PORTION IN |
| Straight Unthreaded Section Diameter | 0.625 INCHES NOMINAL SECOND END FIRST PORTION IN |
| End Similarity | NOT IDENTICAL |
| Screw Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) FIRST END FIRST PORTION |
| Worm Thread Section Length | 0.580 INCHES NOMINAL IN |
| Shaft Thread Direction | RIGHT-HAND FIRST END FIRST PORTION |
| Worm Helix Angle | 3 DEGREES |
| Material | STEEL |
| Worm Thread Quantity | 1 |
| Worm Thread Direction | RIGHT-HAND |
| Worm Pressure Angle in Deg | 20.0000 |
| Worm Body Tapered Bearing Surface End | NOT PROVIDED |
| Straight Unthreaded Length | 0.250 INCHES NOMINAL SECOND END THIRD PORTION IN |
| Straight Unthreaded Length | 0.440 INCHES NOMINAL SECOND END SECOND PORTION IN |
| Straight Unthreaded Length | 0.500 INCHES NOMINAL SECOND END FIRST PORTION 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 |
|---|---|
| 6406839 | Naval Sea Systems Command (USA) |
| 752-6406839-79 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| DF1706-439 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 3040-01-444-5460 is a Worm Shaft, manufactured by Naval Sea Systems Command, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
NSN 3040-01-444-5460 has 2 manufacturer part numbers on file: 6406839 (Naval Sea Systems Command), 752-6406839-79 (Naval Sea Systems Command).
1 possible match (shared part number, not a government interchangeability claim): 5365-01-500-5301. Verify interchangeability with system specifications before substitution.
Key specifications for 752-6406839-79: Shaft Location: BOTH ENDS OF WORM; Worm Thread Lead: 12.800 INCHES NOMINAL IN; Thread Length: 0.380 INCHES NOMINAL FIRST END FIRST PORTION IN; Overall Length: 2.840 INCHES NOMINAL IN. 20 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.