The Seat,valve, cataloged under National Stock Number 4820-01-349-7334, 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 6 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-349-7334 |
| Primary Part Number | 556-6405334-20 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Body Outside Diameter | 1.746 INCHES MINIMUM AND 1.748 INCHES MAXIMUM IN |
| Style Designator | PLAIN |
| Body Inside Diameter | 1.000 INCHES MINIMUM AND 1.520 INCHES MAXIMUM IN |
| Seat Radius | 0.438 INCHES NOMINAL IN |
| Material | PLASTIC POLYAMIDE NYLON OVERALL |
| Seating Surface Shape | RADIAL |
| 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 |
|---|---|
| 211036226 | Naval Sea Systems Command (USA) |
| 556-6405334-20 PRIMARY | Naval Sea Systems Command (USA) |
| DF330687 FIND 20 | Huntington Ingalls Inc Div Newport News Shipbuilding (USA) |
NSN 4820-01-349-7334 is a Seat,valve, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-349-7334 has 3 manufacturer part numbers on file: 211036226 (Naval Sea Systems Command), 556-6405334-20 (Naval Sea Systems Command), DF330687 FIND 20 (Huntington Ingalls Inc Div Newport News Shipbuilding).
Key specifications for 556-6405334-20: Overall Height: 0.312 INCHES NOMINAL IN; Body Outside Diameter: 1.746 INCHES MINIMUM AND 1.748 INCHES MAXIMUM IN; Style Designator: PLAIN; Body Inside Diameter: 1.000 INCHES MINIMUM AND 1.520 INCHES MAXIMUM IN. 6 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.