The Shaft,shouldered, cataloged under National Stock Number 3040-00-657-8520, 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 17 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 | 3040-00-657-8520 |
| Primary Part Number | 6578520 |
| Item Name | Shaft,shouldered |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| FSC Application Data | TRANSMISSION INPUT SHAFT,TRACTOR 18 TON |
| Step Quantity | 5 |
| First End Diameter | 1.9684 INCHES NOMINAL IN |
| Second End Diameter | 2.2440 INCHES NOMINAL IN |
| Largest Step Diameter | 3.145 INCHES MINIMUM AND 3.150 INCHES MAXIMUM IN |
| Second End Spline Minor Diameter | 1.8880 INCHES NOMINAL IN |
| First End Style | CIRCULAR GROOVED |
| Second End Spline Major Diameter | 2.2440 INCHES NOMINAL IN |
| Material Document and Classification | AISI 3130 ASSN STD SINGLE MATERIAL RESPONSE OR QQ-S-624,FS4150H FED SPEC SINGLE MATERIAL RESPONSE |
| End Similarity | NOT IDENTICAL |
| First End Distance From End to Groove | 0.143 INCHES NOMINAL IN |
| Second End Spline Quantity | 6 |
| First End Groove Diameter | 1.8340 INCHES NOMINAL IN |
| Second End Style | SPLINED (STRAIGHT) |
| Material | STEEL |
| First End Groove Width | 0.1000 INCHES NOMINAL IN |
| Second End Spline Length | 3.750 INCHES NOMINAL 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 |
|---|---|
| 6578520 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
NSN 3040-00-657-8520 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 3040-00-657-8520 has 1 manufacturer part number on file: 6578520 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 6578520: FSC Application Data: TRANSMISSION INPUT SHAFT,TRACTOR 18 TON; Step Quantity: 5; First End Diameter: 1.9684 INCHES NOMINAL IN; Second End Diameter: 2.2440 INCHES NOMINAL IN. 17 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.