The Disk,valve, cataloged under National Stock Number 4820-01-284-2139, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 6 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4820-01-284-2139 |
| Item Name | Disk,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.910 INCHES NOMINAL IN |
| Outside Diameter | 2.562 INCHES NOMINAL IN |
| Nominal Thread Size | 0.438 INCHES IN |
| Under Flange Height | 0.542 INCHES NOMINAL IN |
| Thread Class | 2A A |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| 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 |
|---|---|
| C2003-154-018 | 3/9 Design control — primary reference Newdell Company, the Dba Ladish Valves |
| C-5272-1818-20B ITEM 04 | 5/9 Secondary reference Newdell Company, the Dba Ladish Valves |
NSN 4820-01-284-2139 is a Disk,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-284-2139: Flange Seat to Disk End Height: 0.910 INCHES NOMINAL IN; Overall Height: 1.452 INCHES NOMINAL IN; Outside Diameter: 2.562 INCHES NOMINAL IN; Nominal Thread Size: 0.438 INCHES IN. 6 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.