The Shaft,shouldered, cataloged under National Stock Number 3040-00-506-8539, is classified within Federal Supply Class 3040 (Miscellaneous Power Transmission Equipment) of the Mechanical Power Transmission Equipment group. The manufacturer of record is U S Army Tank Automotive Command Amsta-Im-Mm. Government technical data includes 14 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3040-00-506-8539 |
| Primary Part Number | 7974519 |
| Item Name | Shaft,shouldered |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| Surface Finish | 16.0 MICROINCHES |
| Step Quantity | 5 |
| First End Diameter | 1.7719 INCHES NOMINAL IN |
| Second End Diameter | 1.2495 INCHES NOMINAL IN |
| Largest Step Diameter | 2.241 INCHES NOMINAL IN |
| First End Style | PLAIN |
| Second End Keyway Width | 0.3125 INCHES NOMINAL IN |
| Material Document and Classification | QQ-S-624 FED SPEC SINGLE MATERIAL RESPONSE |
| Second End Keyway Depth | 0.177 INCHES NOMINAL IN |
| End Similarity | NOT IDENTICAL |
| Second End Style | FLAT KEYWAYS AND INTERNALLY THREADED |
| Material | STEEL COMP 4140 |
| Second End Internal Thread Length | 1.000 INCHES NOMINAL IN |
| External Keyway Length | 1.430 INCHES NOMINAL SECOND END IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 3040-00-506-8539 is a Shaft,shouldered, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
NSN 3040-00-506-8539 has 2 manufacturer part numbers on file: 7974519 (U S Army Tank Automotive Command Amsta-Im-Mm), M3001780 (Garwood/feller Inc Garwood Winch Div).
Key specifications for 7974519: Surface Finish: 16.0 MICROINCHES; Step Quantity: 5; First End Diameter: 1.7719 INCHES NOMINAL IN; Second End Diameter: 1.2495 INCHES NOMINAL 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.