The Shaft,shouldered, cataloged under National Stock Number 3040-01-357-8755, 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 12 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 3040-01-357-8755 |
| Primary Part Number | 6397389-25 |
| Item Name | Shaft,shouldered |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Second End External Thread Length | 0.750 INCHES NOMINAL IN |
| Step Quantity | 12 |
| First End Diameter | 2.1570 INCHES NOMINAL IN |
| Second End Diameter | 1.2500 INCHES NOMINAL IN |
| Largest Step Diameter | 2.755 INCHES NOMINAL IN |
| First End Slot Width | 0.310 INCHES NOMINAL IN |
| First End Style | SLOTTED |
| Material Document and Classification | ASTM B446 ASSN STD SINGLE MATERIAL RESPONSE |
| End Similarity | NOT IDENTICAL |
| First End Slot Depth | 0.120 INCHES NOMINAL IN |
| Second End Style | EXTERNAL THREADED |
| Material | STEEL |
| 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 |
|---|---|
| 6397389-25 PRIMARY | Naval Sea Systems Command (USA) |
| 639389 PIECE 25 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 6397389 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 3040-01-357-8755 is a Shaft,shouldered, manufactured by Naval Sea Systems Command, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
NSN 3040-01-357-8755 has 2 manufacturer part numbers on file: 6397389-25 (Naval Sea Systems Command), 639389 PIECE 25 (Naval Sea Systems Command).
2 possible matches (shared part number, not a government interchangeability claim): 4320-01-357-9684, 4320-01-358-0665. Verify interchangeability with system specifications before substitution.
Key specifications for 6397389-25: Second End External Thread Length: 0.750 INCHES NOMINAL IN; Step Quantity: 12; First End Diameter: 2.1570 INCHES NOMINAL IN; Second End Diameter: 1.2500 INCHES NOMINAL IN. 12 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.