The Piston,valve, cataloged under National Stock Number 4820-01-447-3208, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Thomas Instrument, Incorporated. Government technical data includes 4 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-447-3208 |
| Primary Part Number | 200913953-01 |
| Item Name | Piston,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Thomas Instrument, Incorporated |
| Status | ACTIVE |
| Outside Diameter | 0.965 INCHES NOMINAL IN |
| Material Document and Classification | AMS 5643 ASSN STD SINGLE MATERIAL RESPONSE |
| Features Provided | GROOVED |
| Material | STEEL CORROSION RESISTING |
| 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 |
|---|---|
| 200913953-01 PRIMARY | Thomas Instrument, Incorporated (USA) |
| Reference | Meaning |
|---|---|
| 200913953-01 | 3/2 Design control — primary reference U.S. Government activity |
| 571R225 | 5/9 Secondary reference U.S. Government activity |
NSN 4820-01-447-3208 is a Piston,valve, manufactured by Thomas Instrument, Incorporated, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-447-3208 has 1 manufacturer part number on file: 200913953-01 (Thomas Instrument, Incorporated).
Key specifications for 200913953-01: Outside Diameter: 0.965 INCHES NOMINAL IN; Material Document and Classification: AMS 5643 ASSN STD SINGLE MATERIAL RESPONSE; Overall Length: 1.353 INCHES NOMINAL IN; Features Provided: GROOVED. 4 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.