The Diaphragm,valve,flat, cataloged under National Stock Number 4820-01-042-9992, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Vacu-Blast Corp. 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-042-9992 |
| Primary Part Number | 909901 |
| Item Name | Diaphragm,valve,flat |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Vacu-Blast Corp |
| Status | ACTIVE |
| Outside Diameter | 5.000 INCHES NOMINAL IN |
| Style Designator | FLAT |
| Material Thickness | 0.125 INCHES NOMINAL IN |
| Bolt Hole Quantity | 6 |
| Bolt Circle Diameter | 4.281 INCHES NOMINAL IN |
| Center Hole Diameter | 0.490 INCHES NOMINAL IN |
| Material | RUBBER SYNTHETIC |
| Hole Diameter | 0.375 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 |
|---|---|
| 909901 PRIMARY | Vacu-Blast Corp (USA) |
NSN 4820-01-042-9992 is a Diaphragm,valve,flat, manufactured by Vacu-Blast Corp, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-042-9992 has 1 manufacturer part number on file: 909901 (Vacu-Blast Corp).
Key specifications for 909901: Outside Diameter: 5.000 INCHES NOMINAL IN; Style Designator: FLAT; Material Thickness: 0.125 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.