The Seat,valve, cataloged under National Stock Number 4820-00-040-0429, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is U S Army Tank Automotive Command Amsta-Im-Mm. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-040-0429 |
| Primary Part Number | 8344652 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.094 INCHES NOMINAL IN |
| Flange Diameter | 0.621 INCHES MINIMUM AND 0.623 INCHES MAXIMUM IN |
| Body Outside Diameter | 0.621 INCHES MINIMUM AND 0.623 INCHES MAXIMUM IN |
| Style Designator | PLAIN FLANGED |
| Body Inside Diameter | 0.313 INCHES NOMINAL IN |
| Under Flange Height | 0.218 INCHES NOMINAL IN |
| Material | STEEL CORROSION RESISTING 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 |
|---|---|
| 8344652 | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| Reference | Meaning |
|---|---|
| 8344652 | 3/9 Design control — primary reference Applied Hydro-Pneumatics Inc |
NSN 4820-00-040-0429 is a Seat,valve, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-040-0429 has 1 manufacturer part number on file: 8344652 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 8344652: Flange Seat to Disk End Height: 0.094 INCHES NOMINAL IN; Flange Diameter: 0.621 INCHES MINIMUM AND 0.623 INCHES MAXIMUM IN; Body Outside Diameter: 0.621 INCHES MINIMUM AND 0.623 INCHES MAXIMUM IN; Style Designator: PLAIN FLANGED. 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.