The Valve,bleeder,hydraulic System, cataloged under National Stock Number 4820-01-628-1683, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is The Boeing Company. Government technical data includes 4 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-628-1683 |
| Primary Part Number | 7-311210250-4 |
| Item Name | Valve,bleeder,hydraulic System |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | The Boeing Company |
| Status | ACTIVE |
| Connection Type | THREADED EXTERNAL PIPE ALL ENDS |
| Style Designator | STRAIGHT THRU |
| Nominal Thread Size | 0.375 INCHES FIRST END IN |
| Thread Quantity Per Inch | 24 FIRST END |
| 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 |
|---|---|
| 7-311210250-4 PRIMARY | The Boeing Company (USA) |
| Reference | Meaning |
|---|---|
| 7-311210250 | D/9 Drawing number reference only The Boeing Company |
NSN 4820-01-628-1683 is a Valve,bleeder,hydraulic System, manufactured by The Boeing Company, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-628-1683 has 1 manufacturer part number on file: 7-311210250-4 (The Boeing Company).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-628-2072. Verify interchangeability with system specifications before substitution.
Key specifications for 7-311210250-4: Connection Type: THREADED EXTERNAL PIPE ALL ENDS; Style Designator: STRAIGHT THRU; Nominal Thread Size: 0.375 INCHES FIRST END IN; End Item Identification: 15200159922031520015992203. 4 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.