The Seat,valve, cataloged under National Stock Number 4820-01-003-4345, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Triumph Actuation Systems - Connecticut, Llc. Government technical data includes 10 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 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-003-4345 |
| Primary Part Number | 3863048-1 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Triumph Actuation Systems - Connecticut, Llc |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.165 INCHES MINIMUM AND 0.170 INCHES MAXIMUM IN |
| Flange Diameter | 0.374 INCHES NOMINAL IN |
| Body Outside Diameter | 0.183 INCHES MINIMUM AND 0.184 INCHES MAXIMUM IN |
| Hardness Rating | 350.0 ROCKWELL C MINIMUM AND 54.0 ROCKWELL C MAXIMUM OVERALL |
| Style Designator | PLAIN FLANGED |
| Body Inside Diameter | 0.189 INCHES NOMINAL IN |
| Surface Treatment | PASSIVATE OVERALL |
| Under Flange Height | 0.060 INCHES MINIMUM AND 0.065 INCHES MAXIMUM IN |
| Material | STEEL COMP 440C OVERALL |
| Seating Surface Shape | FLAT |
| 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 |
|---|---|
| 3863048-1 PRIMARY | Triumph Actuation Systems - Connecticut, Llc (USA) |
NSN 4820-01-003-4345 is a Seat,valve, manufactured by Triumph Actuation Systems - Connecticut, Llc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-003-4345 has 1 manufacturer part number on file: 3863048-1 (Triumph Actuation Systems - Connecticut, Llc).
1 possible match (shared part number, not a government interchangeability claim): 2835-01-327-4179. Verify interchangeability with system specifications before substitution.
Key specifications for 3863048-1: Flange Seat to Disk End Height: 0.165 INCHES MINIMUM AND 0.170 INCHES MAXIMUM IN; Flange Diameter: 0.374 INCHES NOMINAL IN; Body Outside Diameter: 0.183 INCHES MINIMUM AND 0.184 INCHES MAXIMUM IN; Hardness Rating: 350.0 ROCKWELL C MINIMUM AND 54.0 ROCKWELL C MAXIMUM OVERALL. 10 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.