The Seat,valve, cataloged under National Stock Number 4820-01-537-8438, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 2 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-537-8438 |
| Primary Part Number | 801-6405342 FIND 11 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Style Designator | PLAIN |
| Material | PLASTIC SEAT |
| 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 |
|---|---|
| 801-6405342 FIND 11 PRIMARY | Naval Sea Systems Command (USA) |
| DF330707 ITEM 11 | Huntington Ingalls Inc Div Newport News Shipbuilding (USA) |
| Reference | Meaning |
|---|---|
| 211081997 | 5/1 Secondary reference U.S. Government activity |
NSN 4820-01-537-8438 is a Seat,valve, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-537-8438 has 2 manufacturer part numbers on file: 801-6405342 FIND 11 (Naval Sea Systems Command), DF330707 ITEM 11 (Huntington Ingalls Inc Div Newport News Shipbuilding).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-653-8363. Verify interchangeability with system specifications before substitution.
Key specifications for 801-6405342 FIND 11: Style Designator: PLAIN; Part Name Assigned by Controlling Agency: SEAT, BALL; End Item Identification: 1/2 INCH BALL VALVE FOR, OHIO CLASS SSBN (TRIDENT) IN; Material: PLASTIC SEAT. 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.
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.