The Seat,valve, cataloged under National Stock Number 4820-01-197-2882, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Meggitt (north Hollywood), Inc. Dba Meggitt Control Systems Div Meggitt Defense Systems, Inc.. Government technical data includes 9 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-197-2882 |
| Primary Part Number | 12428 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Meggitt (north Hollywood), Inc. Dba Meggitt Control Systems Div Meggitt Defense Systems, Inc. |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.235 INCHES NOMINAL IN |
| Flange Diameter | 0.332 INCHES MINIMUM AND 0.336 INCHES MAXIMUM IN |
| Body Outside Diameter | 0.337 INCHES MINIMUM AND 0.347 INCHES MAXIMUM IN |
| Style Designator | PLAIN FLANGED |
| Material Document and Classification | AMS 5643 ASSN STD ALL MATERIAL RESPONSES OVERALL |
| Body Inside Diameter | 0.275 INCHES MINIMUM AND 0.285 INCHES MAXIMUM IN |
| Surface Treatment | RUBBER OVERALL |
| Under Flange Height | 0.265 INCHES NOMINAL IN |
| Material | STEEL COMP 17-4PH OVERALL |
| 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 |
|---|---|
| 12428 PRIMARY | Meggitt (north Hollywood), Inc. Dba Meggitt Control Systems Div Meggitt Defense Systems, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 12428 | 5/9 Secondary reference Howden Fluid Systems |
| 12428 | 5/9 Secondary reference The Boeing Company Div Defense |
| 12428 | C/1 Advisory reference — outside the item-of-supply concept Meggitt Defense Systems, Inc. Dba Meggitt Defense Systems Inc |
NSN 4820-01-197-2882 is a Seat,valve, manufactured by Meggitt (north Hollywood), Inc. Dba Meggitt Control Systems Div Meggitt Defense Systems, Inc., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-197-2882 has 1 manufacturer part number on file: 12428 (Meggitt (north Hollywood), Inc. Dba Meggitt Control Systems Div Meggitt Defense Systems, Inc.).
5 possible matches (shared part number, not a government interchangeability claim): 5930-01-201-6357, 5963-01-498-1415, 6350-01-522-4149. Verify interchangeability with system specifications before substitution.
Key specifications for 12428: Flange Seat to Disk End Height: 0.235 INCHES NOMINAL IN; Flange Diameter: 0.332 INCHES MINIMUM AND 0.336 INCHES MAXIMUM IN; Body Outside Diameter: 0.337 INCHES MINIMUM AND 0.347 INCHES MAXIMUM IN; Style Designator: PLAIN FLANGED. 9 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.