The Diaphragm,valve,flat, cataloged under National Stock Number 4820-01-485-1820, 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8 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-485-1820 |
| Item Name | Diaphragm,valve,flat |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Outside Diameter | 6.250 INCHES NOMINAL IN |
| Style Designator | FLAT |
| Material Thickness | 0.188 INCHES NOMINAL IN |
| Bolt Hole Quantity | 12 |
| Bolt Circle Diameter | 5.250 INCHES NOMINAL IN |
| Material | PLASTIC POLYAMIDE NYLON AND RUBBER CHLOROPRENE CLASS CR |
| Hole Diameter | 0.500 INCHES NOMINAL IN |
| Reference Number Differentiating Characteristics | AS DIFFERENTIATED BY OXYGEN CLEANING |
| 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 |
|---|---|
| D39747MRRCP | 3/1 Design control — primary reference Naval Inventory Control Point Mechanicsburg |
| D50668 | D/9 Drawing number reference only Hunt Valve Company Inc Dba Union Flonetics |
| D39747MRR | 5/1 Secondary reference Hunt Valve Company Inc Dba Union Flonetics |
| D50668 IT 5 | 5/1 Secondary reference Hunt Valve Company Inc Dba Union Flonetics |
NSN 4820-01-485-1820 is a Diaphragm,valve,flat, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-485-1820: Outside Diameter: 6.250 INCHES NOMINAL IN; Style Designator: FLAT; Material Thickness: 0.188 INCHES NOMINAL IN; Bolt Hole Quantity: 12. 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.