The Seat,valve, cataloged under National Stock Number 4820-01-289-1611, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Koso America Inc.. 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-289-1611 |
| Primary Part Number | 6345482DA |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Koso America Inc. |
| Status | ACTIVE |
| Style Designator | PLAIN FLANGED |
| Material Document and Classification | MIL-I-18397 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Material | CARBON OVERALL |
| Seating Surface Shape | FLAT |
| 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 |
|---|---|
| 6345482DA PRIMARY | Koso America Inc. (USA) |
| Reference | Meaning |
|---|---|
| 6345482 | 5/9 Secondary reference Hammel Dahl Inc |
| V999TZR1000 | D/9 Drawing number reference only Hammel Dahl Inc |
| V999TZR1000 ITEM 5 | 5/9 Secondary reference Hammel Dahl Inc |
| 6345482CB | C/1 Advisory reference — outside the item-of-supply concept Fairbanks Co the |
NSN 4820-01-289-1611 is a Seat,valve, manufactured by Koso America Inc., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-289-1611 has 1 manufacturer part number on file: 6345482DA (Koso America Inc.).
3 possible matches (shared part number, not a government interchangeability claim): 4820-01-289-3675, 4820-01-289-3724, 4820-01-289-3946. Verify interchangeability with system specifications before substitution.
Key specifications for 6345482DA: Style Designator: PLAIN FLANGED; Material Document and Classification: MIL-I-18397 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL; Material: CARBON OVERALL; Seating Surface Shape: FLAT. 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.