The Stem,fluid Valve, cataloged under National Stock Number 4820-01-331-6893, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Inventory Control Point Mechanicsburg. Government technical data includes 6 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-331-6893 |
| Primary Part Number | 2640-806X5 PIECE 18L1 |
| Item Name | Stem,fluid Valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Inventory Control Point Mechanicsburg |
| Status | ACTIVE |
| Valve Type for Which Designed | BALL |
| Criticality Code Justification | ZZZY |
| Material Document and Classification | QQ-N-286 FED SPEC SINGLE MATERIAL RESPONSE |
| Valve Size for Which Designed | 0.500 INCHES IN |
| Material | NICKEL AND COPPER AND ALUMINUM ALLOY |
| 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 Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Part Number | Manufacturer |
|---|---|
| 2640-806X5 PIECE 18L1 | Naval Inventory Control Point Mechanicsburg (USA) |
| 255587 PIECE 18L1 | Naval Inventory Control Point Mechanicsburg (USA) |
| 255580 PIECE 9L1 | Naval Inventory Control Point Mechanicsburg (USA) |
| Reference | Meaning |
|---|---|
| 255587 PIECE 18 | 3/1 Design control — primary reference Huntington Ingalls Inc Div Newport News Shipbuilding |
| 255580 PIECE 9 | 5/1 Secondary reference Huntington Ingalls Inc Div Newport News Shipbuilding |
| SS845-2445483 ASSY MW | 5/1 Secondary reference U.S. Government activity |
| SS845-2445483 ASSY MWL1 | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
NSN 4820-01-331-6893 is a Stem,fluid Valve, manufactured by Naval Inventory Control Point Mechanicsburg, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-331-6893 has 3 manufacturer part numbers on file: 2640-806X5 PIECE 18L1 (Naval Inventory Control Point Mechanicsburg), 255587 PIECE 18L1 (Naval Inventory Control Point Mechanicsburg), 255580 PIECE 9L1 (Naval Inventory Control Point Mechanicsburg).
Key specifications for 2640-806X5 PIECE 18L1: Valve Type for Which Designed: BALL; Criticality Code Justification: ZZZY; Material Document and Classification: QQ-N-286 FED SPEC SINGLE MATERIAL RESPONSE; Valve Size for Which Designed: 0.500 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.
NSN 4820-01-331-6893 has DEMIL Code Q. 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.