The Seat,valve, cataloged under National Stock Number 4820-01-351-8543, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Triumph Engine Control Systems Llc. 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 | 4820-01-351-8543 |
| Primary Part Number | 109551 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Triumph Engine Control Systems Llc |
| Status | ACTIVE |
| Surface Treatment Document and Classification | AMS2470 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| Material Document and Classification | AMS4120 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Size | 0.375 INCHES SINGLE THREADED PORTION IN |
| Surface Treatment | ANODIZE OVERALL |
| Thread Class | 3B SINGLE THREADED PORTION |
| Thread Quantity Per Inch | 24 SINGLE THREADED PORTION |
| Material | ALUMINUM ALLOY 2024 OVERALL |
| Thread Series Designator | UNF SINGLE THREADED PORTION |
| 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 |
|---|---|
| 109551 PRIMARY | Triumph Engine Control Systems Llc (USA) |
NSN 4820-01-351-8543 is a Seat,valve, manufactured by Triumph Engine Control Systems Llc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-351-8543 has 1 manufacturer part number on file: 109551 (Triumph Engine Control Systems Llc).
Key specifications for 109551: Surface Treatment Document and Classification: AMS2470 ASSN STD SINGLE TREATMENT RESPONSE OVERALL; Material Document and Classification: AMS4120 ASSN STD SINGLE MATERIAL RESPONSE OVERALL; Nominal Thread Size: 0.375 INCHES SINGLE THREADED PORTION IN; Surface Treatment: ANODIZE OVERALL. 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.
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.