The Flange,gland,valve, cataloged under National Stock Number 4820-01-128-4243, 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9 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-128-4243 |
| Item Name | Flange,gland,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Flange Shape | OVAL |
| Bolt Hole Nominal Diameter | 0.375 INCHES IN |
| Valve Size | 0.500 INCHES IN |
| Bolt Hole Quantity | 2 |
| Nominal Center Hole Diameter | 0.562 INCHES IN |
| Valve Type | GLOBE |
| Flange Width | 0.375 INCHES IN |
| Material | STEEL |
| Flange Length | 1.188 INCHES IN |
| 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-C3XX-40 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-128-4243 is a Flange,gland,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 4820-01-344-1929. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-128-4243: Flange Shape: OVAL; Bolt Hole Nominal Diameter: 0.375 INCHES IN; Valve Size: 0.500 INCHES IN; Bolt Hole Quantity: 2. 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.
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.