The Seat,valve, cataloged under National Stock Number 4820-01-128-4595, 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 12 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-128-4595 |
| Primary Part Number | 1D22145-1 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | The Boeing Company |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.625 INCHES NOMINAL IN |
| Flange Diameter | 0.673 INCHES NOMINAL IN |
| Body Outside Diameter | 0.390 INCHES NOMINAL IN |
| Seal Accommodation Type | GROOVED |
| Body Stepped Inside Diameter | 0.090 INCHES NOMINAL SECOND STEP IN |
| Body Stepped Inside Diameter | 0.300 INCHES NOMINAL FIRST STEP IN |
| Body Stepped Inside Diameter | 0.314 INCHES NOMINAL THIRD STEP IN |
| Style Designator | PLAIN FLANGED |
| Under Flange Height | 1.315 INCHES NOMINAL IN |
| Material | NICKEL ALLOY K-500 OVERALL |
| Seat Angle in Deg | 45.000 NOMINAL |
| Seating Surface Shape | ANGULAR |
| 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 |
|---|---|
| 1D22145-1 PRIMARY | The Boeing Company (USA) |
| Reference | Meaning |
|---|---|
| 10124591 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
NSN 4820-01-128-4595 is a Seat,valve, manufactured by The Boeing Company, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-128-4595 has 1 manufacturer part number on file: 1D22145-1 (The Boeing Company).
1 possible match (shared part number, not a government interchangeability claim): 5910-01-178-5187. Verify interchangeability with system specifications before substitution.
Key specifications for 1D22145-1: Flange Seat to Disk End Height: 0.625 INCHES NOMINAL IN; Flange Diameter: 0.673 INCHES NOMINAL IN; Overall Height: 1.940 INCHES NOMINAL IN; Body Outside Diameter: 0.390 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.