The Diaphragm,valve,flat, cataloged under National Stock Number 4820-00-932-4806, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Fisher Controls Co Inc. Government technical data includes 8 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-932-4806 |
| Primary Part Number | 1B7989-T0022 |
| Item Name | Diaphragm,valve,flat |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Fisher Controls Co Inc |
| Status | ACTIVE |
| Outside Diameter | 2.875 INCHES NOMINAL IN |
| Style Designator | FLAT |
| Material Thickness | 0.027 INCHES NOMINAL IN |
| Bolt Hole Quantity | 6 |
| Bolt Circle Diameter | 2.570 INCHES NOMINAL IN |
| Center Hole Diameter | 0.062 INCHES NOMINAL IN |
| Material | COPPER ALLOY AND RUBBER SYNTHETIC AND STEEL |
| Hole Diameter | 0.180 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 |
| Part Number | Manufacturer |
|---|---|
| 1B7989-T0022 PRIMARY | Fisher Controls Co Inc (USA) |
| Reference | Meaning |
|---|---|
| 1B7989 | 5/9 Secondary reference Fisher Controls Co Inc |
NSN 4820-00-932-4806 is a Diaphragm,valve,flat, manufactured by Fisher Controls Co Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-932-4806 has 1 manufacturer part number on file: 1B7989-T0022 (Fisher Controls Co Inc).
Key specifications for 1B7989-T0022: Outside Diameter: 2.875 INCHES NOMINAL IN; Style Designator: FLAT; Material Thickness: 0.027 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.