The Disk,valve, cataloged under National Stock Number 4820-01-421-8090, 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 7 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-421-8090 |
| Primary Part Number | 803-6397434-X52XXX-014 |
| Item Name | Disk,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Outside Diameter | 1.625 INCHES NOMINAL IN |
| Style Designator | PLUG |
| Seat Angle | 45.0 DEGREES NOMINAL |
| Nominal Thread Size | 1.312 INCHES IN |
| Thread Class | 2B |
| Thread Quantity Per Inch | 16 |
| Thread Series Designator | UN |
| 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 |
|---|---|
| 803-6397434-X52XXX ITEM 14 | Naval Sea Systems Command (USA) |
| 803-6397434-X52XXX-014 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 6397434 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 4820-01-421-8090 is a Disk,valve, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-421-8090 has 2 manufacturer part numbers on file: 803-6397434-X52XXX ITEM 14 (Naval Sea Systems Command), 803-6397434-X52XXX-014 (Naval Sea Systems Command).
Key specifications for 803-6397434-X52XXX-014: Overall Height: 0.594 INCHES NOMINAL IN; Outside Diameter: 1.625 INCHES NOMINAL IN; Style Designator: PLUG; Seat Angle: 45.0 DEGREES NOMINAL. 7 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.