The Disk,valve, cataloged under National Stock Number 4820-01-039-1981, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 4 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4820-01-039-1981 |
| Primary Part Number | 4666813 |
| Item Name | Disk,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Outside Diameter | 0.495 INCHES MINIMUM AND 0.502 INCHES MAXIMUM IN |
| Style Designator | PLAIN |
| Inside Diameter | 0.372 INCHES MINIMUM AND 0.380 INCHES MAXIMUM IN |
| Material | PLASTIC ACETAL |
| 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 |
|---|---|
| 4666813 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 4666813 | 5/2 Secondary reference U.S. Government activity |
NSN 4820-01-039-1981 is a Disk,valve, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-039-1981 has 1 manufacturer part number on file: 4666813 (Naval Sea Systems Command).
Key specifications for 4666813: Overall Height: 0.015 INCHES MINIMUM AND 0.025 INCHES MAXIMUM IN; Outside Diameter: 0.495 INCHES MINIMUM AND 0.502 INCHES MAXIMUM IN; Style Designator: PLAIN; Inside Diameter: 0.372 INCHES MINIMUM AND 0.380 INCHES MAXIMUM IN. 4 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.