The Diaphragm,valve,flat, cataloged under National Stock Number 4820-01-040-4501, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Siemens Industry, Inc. Dba Siemens Energy Div Process Industries and Drives. Government technical data includes 6 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-040-4501 |
| Primary Part Number | 14495-55AND57 |
| Item Name | Diaphragm,valve,flat |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Siemens Industry, Inc. Dba Siemens Energy Div Process Industries and Drives |
| Status | ACTIVE |
| Outside Diameter | 3.375 INCHES NOMINAL IN |
| Material Thickness | 0.016 INCHES NOMINAL IN |
| Bolt Hole Quantity | 12 |
| Bolt Circle Diameter | 2.885 INCHES NOMINAL IN |
| Material | RUBBER |
| Hole Diameter | 0.285 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 |
|---|---|
| 14495-21 | Siemens Industry, Inc. Dba Siemens Energy Div Process Industries and Drives (USA) |
| 14495-55AND57 PRIMARY | Siemens Industry, Inc. Dba Siemens Energy Div Process Industries and Drives (USA) |
NSN 4820-01-040-4501 is a Diaphragm,valve,flat, manufactured by Siemens Industry, Inc. Dba Siemens Energy Div Process Industries and Drives, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-040-4501 has 2 manufacturer part numbers on file: 14495-21 (Siemens Industry, Inc. Dba Siemens Energy Div Process Industries and Drives), 14495-55AND57 (Siemens Industry, Inc. Dba Siemens Energy Div Process Industries and Drives).
Key specifications for 14495-55AND57: Outside Diameter: 3.375 INCHES NOMINAL IN; Material Thickness: 0.016 INCHES NOMINAL IN; Bolt Hole Quantity: 12; Bolt Circle Diameter: 2.885 INCHES NOMINAL IN. 6 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.