The Stem,fluid Valve, cataloged under National Stock Number 4820-01-331-1820, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 2 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-331-1820 |
| Item Name | Stem,fluid Valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Criticality Code Justification | ZZZY |
| Reference Number Differentiating Characteristics | QUALITY CONTROL IAW NAVSHIPS 0948-045-7010 MATERIAL IDENTIFICATION AND CONTROL INSTRUCTION FOR LEVEL 1 ITEMS |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Reference | Meaning |
|---|---|
| SS845-2445483 ASSY AF | 3/1 Design control — primary reference U.S. Government activity |
| 26M00-81RR01 ASSY AF | 5/1 Secondary reference U.S. Government activity |
| SS845-2445483 ASSY AFL1 | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
| 26M00-81RR01 ASSY AFL1 | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
NSN 4820-01-331-1820 is a Stem,fluid Valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-331-1820: Criticality Code Justification: ZZZY; End Item Identification: BALL VALVE; Reference Number Differentiating Characteristics: QUALITY CONTROL IAW NAVSHIPS 0948-045-7010 MATERIAL IDENTIFICATION AND CONTROL INSTRUCTION FOR LEVEL 1 ITEMS. 2 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.
NSN 4820-01-331-1820 has DEMIL Code B. Demilitarization may be required before disposal or transfer to non-military entities.
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.