The Disk,valve, cataloged under National Stock Number 4820-01-555-9529, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 8 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4820-01-555-9529 |
| Item Name | Disk,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Style Designator | PLUG |
| Material Document and Classification | ASTM A105 ASSN STD SINGLE MATERIAL RESPONSE |
| Seat Angle | 14.0 DEGREES NOMINAL |
| Nominal Thread Size | 1.437 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 A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 803-2177525 | D/9 Drawing number reference only U.S. Government activity |
| 803-2177525-C8XX-77 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-555-9529 is a Disk,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-555-9529: Overall Height: 1.870 INCHES NOMINAL IN; Style Designator: PLUG; Material Document and Classification: ASTM A105 ASSN STD SINGLE MATERIAL RESPONSE; Seat Angle: 14.0 DEGREES NOMINAL. 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.