The Seat,valve, cataloged under National Stock Number 4820-00-564-9891, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Us Army Aviation and Missile Command. Government technical data includes 13 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 | 4820-00-564-9891 |
| Primary Part Number | 8511447 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Us Army Aviation and Missile Command |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.188 INCHES NOMINAL IN |
| Flange Diameter | 0.432 INCHES MINIMUM AND 0.442 INCHES MAXIMUM IN |
| Body Outside Diameter | 0.370 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN |
| Taper Minor Diameter | 0.255 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN |
| Style Designator | PLAIN FLANGED |
| Material Document and Classification | QQ-A-325 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Taper Major Diameter | 0.370 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN |
| Body Inside Diameter | 0.255 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN |
| Taper Length | 0.625 INCHES NOMINAL IN |
| Under Flange Height | 0.438 INCHES NOMINAL IN |
| Material | ALUMINUM ALLOY OVERALL |
| Seat Angle in Deg | 45.000 NOMINAL |
| 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 |
|---|---|
| 8511447 PRIMARY | Us Army Aviation and Missile Command (USA) |
NSN 4820-00-564-9891 is a Seat,valve, manufactured by Us Army Aviation and Missile Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-564-9891 has 1 manufacturer part number on file: 8511447 (Us Army Aviation and Missile Command).
Key specifications for 8511447: Flange Seat to Disk End Height: 0.188 INCHES NOMINAL IN; Flange Diameter: 0.432 INCHES MINIMUM AND 0.442 INCHES MAXIMUM IN; Body Outside Diameter: 0.370 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN; Taper Minor Diameter: 0.255 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN. 13 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.