The Collar,shaft, cataloged under National Stock Number 3040-00-409-2178, is classified within Federal Supply Class 3040 (Miscellaneous Power Transmission Equipment) of the Mechanical Power Transmission Equipment group. The manufacturer of record is Naval Group Site De Brest. Government technical data includes 8 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3040-00-409-2178 |
| Primary Part Number | EPA21A00-075 |
| Item Name | Collar,shaft |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Manufacturer | Naval Group Site De Brest |
| Status | ACTIVE |
| Surface Finish | 125 MICROINCHES INSIDE PERIPHERY |
| Surface Finish | 125 MICROINCHES OUTSIDE PERIPHERY |
| Surface Finish | 63 MICROINCHES BOTH BEARING FLATS |
| Material Document and Classification | MIL-S-18729, COND A MIL SPEC SINGLE MATERIAL RESPONSE |
| Angle Between Centerlines of Securing Holes in Deg | 90.0 |
| Securing Hole Quantity | 4 |
| Surface Treatment | CADMIUM |
| Material | STEEL COMP 4130 |
| 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 |
|---|---|
| EPA21A00-075 | Naval Group Site De Brest (FRA) |
| Reference | Meaning |
|---|---|
| 420396-1 | 3/2 Design control — primary reference U.S. Government activity |
NSN 3040-00-409-2178 is a Collar,shaft, manufactured by Naval Group Site De Brest, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
NSN 3040-00-409-2178 has 1 manufacturer part number on file: EPA21A00-075 (Naval Group Site De Brest).
Key specifications for EPA21A00-075: Surface Finish: 125 MICROINCHES INSIDE PERIPHERY; Surface Finish: 125 MICROINCHES OUTSIDE PERIPHERY; Surface Finish: 63 MICROINCHES BOTH BEARING FLATS; Material Document and Classification: MIL-S-18729, COND A MIL SPEC SINGLE MATERIAL RESPONSE. 8 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.