The Disk,valve, cataloged under National Stock Number 4820-01-121-2038, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 5 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-121-2038 |
| Item Name | Disk,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Shank Diameter | 0.247 INCHES MINIMUM AND 0.249 INCHES MAXIMUM IN |
| Flange Diameter | 0.670 INCHES MINIMUM AND 0.690 INCHES MAXIMUM IN |
| Style Designator | POPPET |
| Material Document and Classification | QQ-S-763, CLASS 304, COND A FED SPEC SINGLE MATERIAL RESPONSE |
| Material | STEEL COMP 304 |
| 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 |
|---|---|
| 87791-5101 ITEM 19 | 3/2 Design control — primary reference U.S. Government activity |
| 516-4775901 ITEM 19 | 5/2 Secondary reference U.S. Government activity |
| 516-4775901 | D/9 Drawing number reference only U.S. Government activity |
NSN 4820-01-121-2038 is a Disk,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-121-2038: Shank Diameter: 0.247 INCHES MINIMUM AND 0.249 INCHES MAXIMUM IN; Flange Diameter: 0.670 INCHES MINIMUM AND 0.690 INCHES MAXIMUM IN; Overall Height: 0.940 INCHES NOMINAL IN; Style Designator: POPPET. 5 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.