The Diaphragm,valve,flat, cataloged under National Stock Number 4820-01-124-3953, 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8 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-124-3953 |
| Item Name | Diaphragm,valve,flat |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Outside Diameter | 4.250 INCHES NOMINAL IN |
| Style Designator | FLAT |
| Material Thickness | 0.018 INCHES NOMINAL IN |
| Bolt Hole Quantity | 6 |
| Bolt Circle Diameter | 3.812 INCHES NOMINAL IN |
| Center Hole Diameter | 0.188 INCHES NOMINAL IN |
| Material | RUBBER SYNTHETIC |
| Hole Diameter | 0.250 INCHES NOMINAL 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 |
|---|---|
| 67460G | 5/2 Secondary reference U.S. Government activity |
| 80343H | 3/2 Design control — primary reference U.S. Government activity |
| 80343 | D/9 Drawing number reference only U.S. Government activity |
| 67467B | 5/9 Secondary reference U.S. Government activity |
NSN 4820-01-124-3953 is a Diaphragm,valve,flat, classified under FSC 4820, Valves, Nonpowered. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 9150-01-703-2034. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-124-3953: Outside Diameter: 4.250 INCHES NOMINAL IN; Style Designator: FLAT; Material Thickness: 0.018 INCHES NOMINAL IN; Bolt Hole Quantity: 6. 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.