The Seat,valve, cataloged under National Stock Number 4820-01-108-2632, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier. Government technical data includes 9 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-108-2632 |
| Primary Part Number | 639AS1446 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier |
| Status | ACTIVE |
| Flange Diameter | 0.627 INCHES MINIMUM AND 0.628 INCHES MAXIMUM IN |
| Body Outside Diameter | 0.330 INCHES NOMINAL IN |
| Body Inside Diameter | 0.128 INCHES MINIMUM AND 0.130 INCHES MAXIMUM IN |
| Nominal Thread Size | 0.312 INCHES SINGLE THREADED PORTION IN |
| Thread Class | 2B SINGLE THREADED PORTION |
| Material | PLASTIC POLYAMIDE NYLON OVERALL |
| Seat Angle in Deg | 45.000 NOMINAL |
| Thread Series Designator | UNEF SINGLE THREADED PORTION |
| Seating Surface Shape | ANGULAR |
| 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 |
|---|---|
| 639AS1446 PRIMARY | Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier (USA) |
NSN 4820-01-108-2632 is a Seat,valve, manufactured by Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-108-2632 has 1 manufacturer part number on file: 639AS1446 (Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier).
Key specifications for 639AS1446: Flange Diameter: 0.627 INCHES MINIMUM AND 0.628 INCHES MAXIMUM IN; Body Outside Diameter: 0.330 INCHES NOMINAL IN; Body Inside Diameter: 0.128 INCHES MINIMUM AND 0.130 INCHES MAXIMUM IN; Nominal Thread Size: 0.312 INCHES SINGLE THREADED PORTION IN. 9 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.