The Disk,valve, cataloged under National Stock Number 4820-00-467-6873, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Rolls-Royce Controls and Data Services Limited. Government technical data includes 6 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-467-6873 |
| Primary Part Number | 640A500 |
| Item Name | Disk,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Rolls-Royce Controls and Data Services Limited |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.109 INCHES NOMINAL IN |
| Outside Diameter | 0.875 INCHES NOMINAL IN |
| Nominal Thread Size | 0.516 INCHES IN |
| Thread Class | 2A A |
| Material | STEEL |
| Thread Series Designator | UNF |
| 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 |
|---|---|
| 640A500 | Rolls-Royce Controls and Data Services Limited (GBR) |
| Reference | Meaning |
|---|---|
| 640A500 | 3/2 Design control — primary reference U.S. Government activity |
| 640A500 | 5/9 Secondary reference Goodrich Control Systems Ltd T/a Goodrich Engine Control Systems |
NSN 4820-00-467-6873 is a Disk,valve, manufactured by Rolls-Royce Controls and Data Services Limited, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-467-6873 has 1 manufacturer part number on file: 640A500 (Rolls-Royce Controls and Data Services Limited).
Key specifications for 640A500: Flange Seat to Disk End Height: 0.109 INCHES NOMINAL IN; Overall Height: 0.625 INCHES NOMINAL IN; Outside Diameter: 0.875 INCHES NOMINAL IN; Nominal Thread Size: 0.516 INCHES 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.