The Disk,valve, cataloged under National Stock Number 4820-01-666-8000, 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 3 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4820-01-666-8000 |
| Primary Part Number | 845-8616935 ITEM 77 |
| Item Name | Disk,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Outside Diameter | 2.50 INCHES NOMINAL IN |
| Material Document and Classification | AMS-T-9046 MIL STD SINGLE MATERIAL RESPONSE |
| Material | TITANIUM ALLOY |
| 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 |
|---|---|
| 845-8616935 ITEM 77 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 2644-253-01 ITEM 77 | 5/2 Secondary reference U.S. Government activity |
NSN 4820-01-666-8000 is a Disk,valve, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-666-8000 has 1 manufacturer part number on file: 845-8616935 ITEM 77 (Naval Sea Systems Command).
Key specifications for 845-8616935 ITEM 77: Outside Diameter: 2.50 INCHES NOMINAL IN; Material Document and Classification: AMS-T-9046 MIL STD SINGLE MATERIAL RESPONSE; Part Name Assigned by Controlling Agency: DISC; End Item Identification: VALVE,SWING CHECK. 3 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.