The Seat,valve, cataloged under National Stock Number 4820-01-337-0068, 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 8 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. 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 | 4820-01-337-0068 |
| Primary Part Number | 801-6404739 FIND 28 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Body Outside Diameter | 7.236 INCHES MINIMUM AND 7.246 INCHES MAXIMUM IN |
| Body Stepped Inside Diameter | 5.000 INCHES NOMINAL FIRST STEP IN |
| Body Stepped Inside Diameter | 5.375 INCHES NOMINAL SECOND STEP IN |
| Body Stepped Inside Diameter | 6.235 INCHES NOMINAL THIRD STEP IN |
| Body Stepped Inside Diameter | 6.531 INCHES NOMINAL FOURTH STEP IN |
| Style Designator | THREADED FLANGED |
| Material | PLASTIC POLYAMIDE NYLON OVERALL |
| Seating Surface Shape | O-RING |
| 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 |
|---|---|
| 801-6404739 FIND 28 PRIMARY | Naval Sea Systems Command (USA) |
| DF330610 FIND 28 | Huntington Ingalls Inc Div Newport News Shipbuilding (USA) |
| 211046123 | Naval Sea Systems Command (USA) |
NSN 4820-01-337-0068 is a Seat,valve, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-337-0068 has 3 manufacturer part numbers on file: 801-6404739 FIND 28 (Naval Sea Systems Command), DF330610 FIND 28 (Huntington Ingalls Inc Div Newport News Shipbuilding), 211046123 (Naval Sea Systems Command).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-633-2497. Verify interchangeability with system specifications before substitution.
Key specifications for 801-6404739 FIND 28: Overall Height: 0.875 INCHES NOMINAL IN; Body Outside Diameter: 7.236 INCHES MINIMUM AND 7.246 INCHES MAXIMUM IN; Body Stepped Inside Diameter: 5.000 INCHES NOMINAL FIRST STEP IN; Body Stepped Inside Diameter: 5.375 INCHES NOMINAL SECOND STEP IN. 8 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.