The Disk,valve, cataloged under National Stock Number 4820-01-555-9481, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 9 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-555-9481 |
| Item Name | Disk,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Thread Tolerance Class | 2A EXTERNAL A |
| Style Designator | PLUG |
| Material Document and Classification | ASTM A105 ASSN STD SINGLE MATERIAL RESPONSE |
| Seat Angle | 14.0 DEGREES NOMINAL |
| Nominal Thread Size | 1.250 INCHES IN |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 16 |
| Material | STEEL UNS K03504 |
| Thread Series Designator | UN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 803-2177525-C6XX-77 | 3/2 Design control — primary reference U.S. Government activity |
| 803-2177525 | D/9 Drawing number reference only U.S. Government activity |
NSN 4820-01-555-9481 is a Disk,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-555-9481: Overall Height: 1.310 INCHES NOMINAL IN; Thread Tolerance Class: 2A EXTERNAL A; Style Designator: PLUG; Material Document and Classification: ASTM A105 ASSN STD SINGLE MATERIAL RESPONSE. 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.
NSN 4820-01-555-9481 has DEMIL Code B. Demilitarization may be required before disposal or transfer to non-military entities.
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.