The Disk,valve, cataloged under National Stock Number 4820-01-105-0002, 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 5 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-105-0002 |
| Primary Part Number | 845-4558743 ITEM 21 |
| Item Name | Disk,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Shank Diameter | 2.123 INCHES NOMINAL IN |
| Flange Diameter | 3.875 INCHES NOMINAL IN |
| Style Designator | POPPET |
| Material Document and Classification | QQ-S-763, CLASS 304, COND A FED SPEC SINGLE MATERIAL RESPONSE |
| Material | STEEL COMP 304 |
| 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 |
|---|---|
| 845-4558743 ITEM 21 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 845-4558743 | D/9 Drawing number reference only Naval Sea Systems Command |
| 2641-809-42 | 5/9 Secondary reference U.S. Government activity |
| 2641-809-42 ITEM 82 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-105-0002 is a Disk,valve, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-105-0002 has 1 manufacturer part number on file: 845-4558743 ITEM 21 (Naval Sea Systems Command).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-105-1299. Verify interchangeability with system specifications before substitution.
Key specifications for 845-4558743 ITEM 21: Shank Diameter: 2.123 INCHES NOMINAL IN; Flange Diameter: 3.875 INCHES NOMINAL IN; Overall Height: 5.438 INCHES NOMINAL IN; Style Designator: POPPET. 5 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.