The Seat,valve, cataloged under National Stock Number 4820-00-340-0856, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Woodward Hrt, Inc. Dba Woodward Hrt Inc. Government technical data includes 8 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 | 4820-00-340-0856 |
| Primary Part Number | 8U8018-5 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Woodward Hrt, Inc. Dba Woodward Hrt Inc |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.890 INCHES MINIMUM AND 0.900 INCHES MAXIMUM IN |
| Flange Diameter | 0.558 INCHES MINIMUM AND 0.560 INCHES MAXIMUM IN |
| FSC Application Data | VALVE,LINEAR,DIRECTIONAL CONTROL,ACFT |
| Body Outside Diameter | 0.433 INCHES MINIMUM AND 0.435 INCHES MAXIMUM IN |
| Body Inside Diameter | 0.188 INCHES MINIMUM AND 0.189 INCHES MAXIMUM IN |
| Surface Treatment | ANODIZE OVERALL |
| Under Flange Height | 0.140 INCHES MINIMUM AND 0.150 INCHES MAXIMUM IN |
| Material | ALUMINUM ALLOY 7075 OVERALL |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 8U8018-5 PRIMARY | Woodward Hrt, Inc. Dba Woodward Hrt Inc (USA) |
NSN 4820-00-340-0856 is a Seat,valve, manufactured by Woodward Hrt, Inc. Dba Woodward Hrt Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-340-0856 has 1 manufacturer part number on file: 8U8018-5 (Woodward Hrt, Inc. Dba Woodward Hrt Inc).
Key specifications for 8U8018-5: Flange Seat to Disk End Height: 0.890 INCHES MINIMUM AND 0.900 INCHES MAXIMUM IN; Flange Diameter: 0.558 INCHES MINIMUM AND 0.560 INCHES MAXIMUM IN; FSC Application Data: VALVE,LINEAR,DIRECTIONAL CONTROL,ACFT; Body Outside Diameter: 0.433 INCHES MINIMUM AND 0.435 INCHES MAXIMUM 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.
NSN 4820-00-340-0856 has DEMIL Code B. Demilitarization may be required before disposal or transfer to non-military entities.
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.