The Piston,valve, cataloged under National Stock Number 4820-00-003-5563, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 7 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-00-003-5563 |
| Item Name | Piston,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Surface Treatment Document and Classification | MIL-A-8625, TYPE I MIL SPEC SINGLE TREATMENT RESPONSE |
| Outside Diameter | 0.971 INCHES MINIMUM AND 0.972 INCHES MAXIMUM IN |
| Material Document and Classification | QQ-A-225/6, ALLOY 2024, T4 FED SPEC SINGLE MATERIAL RESPONSE |
| Inside Diameter | 0.565 INCHES MINIMUM AND 0.570 INCHES MAXIMUM IN |
| Surface Treatment | ANODIZE |
| Valve Design Control Activity | 99643 |
| Material | ALUMINUM ALLOY |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 9907-44 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-00-003-5563 is a Piston,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 6515-01-473-0269. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-00-003-5563: Surface Treatment Document and Classification: MIL-A-8625, TYPE I MIL SPEC SINGLE TREATMENT RESPONSE; Outside Diameter: 0.971 INCHES MINIMUM AND 0.972 INCHES MAXIMUM IN; Material Document and Classification: QQ-A-225/6, ALLOY 2024, T4 FED SPEC SINGLE MATERIAL RESPONSE; Inside Diameter: 0.565 INCHES MINIMUM AND 0.570 INCHES MAXIMUM IN. 7 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.