The Housing,antifriction Bearing,air, cataloged under National Stock Number 2840-00-751-8400, is classified within Federal Supply Class 2840 (Gas Turbines and Jet Engines, Aircraft, Prime Moving; and Components) of the Engines, Turbines, and Components group. The manufacturer of record is Union Machine Co of Lynn, Inc. Government technical data includes 2 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2840-00-751-8400 |
| Primary Part Number | 278D521P6 |
| Item Name | Housing,antifriction Bearing,air |
| FSC / FSG | 2840 / 28 — Gas Turbines and Jet Engines, Aircraft, Prime Moving; and Components |
| Manufacturer | Union Machine Co of Lynn, Inc |
| Status | ACTIVE |
| Criticality Code Justification | AGAV |
| Engine Section Location | TURBINE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | F |
| Part Number | Manufacturer |
|---|---|
| 278D521P6 | Union Machine Co of Lynn, Inc (USA) |
| Reference | Meaning |
|---|---|
| 278D521P6 | 3/2 Design control — primary reference U.S. Government activity |
| 278D521P6 | 5/9 Secondary reference Berkshire Industries, Inc. |
| 278D521P6 | 5/9 Secondary reference B & E Tool Company, Inc. Dba B & E Tool |
| 278D521P6 | 5/9 Secondary reference General Electric Company |
NSN 2840-00-751-8400 is a Housing,antifriction Bearing,air, manufactured by Union Machine Co of Lynn, Inc, classified under FSC 2840, Gas Turbines and Jet Engines, Aircraft, Prime Moving; and Components. Status: active.
NSN 2840-00-751-8400 has 1 manufacturer part number on file: 278D521P6 (Union Machine Co of Lynn, Inc).
Key specifications for 278D521P6: Criticality Code Justification: AGAV; Overall Length: 1.320 INCHES MINIMUM AND 1.325 INCHES MAXIMUM IN; Engine Section Location: TURBINE; End Item Identification: J-85 AIRCRAFT ENGINE. 2 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 2840-00-751-8400 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.