The Worm Shaft, cataloged under National Stock Number 3040-00-490-4858, is classified within Federal Supply Class 3040 (Miscellaneous Power Transmission Equipment) of the Mechanical Power Transmission Equipment group. The manufacturer of record is Emerson Electric Co Alco Controls Div. Government technical data includes 23 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3040-00-490-4858 |
| Primary Part Number | W21562 |
| Item Name | Worm Shaft |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Manufacturer | Emerson Electric Co Alco Controls Div |
| Status | ACTIVE |
| Shaft Location | ONE END OF WORM |
| Worm Body Length | 1.326 INCHES NOMINAL IN |
| Material Document and Classification | SAE 4140 ASSN STD SINGLE MATERIAL RESPONSE |
| Worm Pitch Diameter | 0.322 INCHES MINIMUM AND 0.325 INCHES MAXIMUM IN |
| Worm Outside Diameter | 0.375 INCHES NOMINAL IN |
| Straight Unthreaded Section Diameter | 0.197 INCHES NOMINAL FIRST END FIRST PORTION IN |
| Straight Unthreaded Section Diameter | 0.197 INCHES NOMINAL SECOND END FIRST PORTION IN |
| Straight Unthreaded Section Diameter | 0.197 INCHES NOMINAL SECOND END SECOND PORTION IN |
| Unthreaded Section Pin Hole Diameter | 0.0930 INCHES NOMINAL FIRST END FIRST PORTION IN |
| Unthreaded Section Pin Hole Diameter | 0.1470 INCHES MINIMUM AND 0.1500 INCHES MAXIMUM SECOND END SECOND PORTION IN |
| End Similarity | NOT IDENTICAL |
| Shaft Hardness Rating | 48.0 ROCKWELL C MINIMUM AND 53.0 ROCKWELL C MAXIMUM LOCATION NOT OTHERWISE SPECIFIED |
| Worm Thread Section Length | 0.750 INCHES NOMINAL IN |
| Material | STEEL COMP 4140 |
| Worm Thread Quantity | 4 |
| Worm Thread Direction | RIGHT-HAND |
| Unthreaded Section Keyway Width | 0.1720 INCHES MINIMUM AND 0.1770 INCHES MAXIMUM FIRST END FIRST PORTION IN |
| Unthreaded Section Keyway Width | 0.1720 INCHES MINIMUM AND 0.1770 INCHES MAXIMUM SECOND END FIRST PORTION IN |
| Unthreaded Section Keyway Width | 0.1720 INCHES MINIMUM AND 0.1770 INCHES MAXIMUM SECOND END SECOND PORTION IN |
| Worm Pressure Angle in Deg | 20.000 |
| Straight Unthreaded Length | 0.196 INCHES NOMINAL FIRST END FIRST PORTION IN |
| Straight Unthreaded Length | 0.200 INCHES NOMINAL SECOND END SECOND PORTION IN |
| Straight Unthreaded Length | 0.237 INCHES NOMINAL SECOND END FIRST PORTION 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 |
| Part Number | Manufacturer |
|---|---|
| W21562 PRIMARY | Emerson Electric Co Alco Controls Div (USA) |
NSN 3040-00-490-4858 is a Worm Shaft, manufactured by Emerson Electric Co Alco Controls Div, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
NSN 3040-00-490-4858 has 1 manufacturer part number on file: W21562 (Emerson Electric Co Alco Controls Div).
Key specifications for W21562: Shaft Location: ONE END OF WORM; Worm Body Length: 1.326 INCHES NOMINAL IN; Material Document and Classification: SAE 4140 ASSN STD SINGLE MATERIAL RESPONSE; Overall Length: 1.959 INCHES NOMINAL IN. 23 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 3040-00-490-4858 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.