The Stem,fluid Valve, cataloged under National Stock Number 4820-01-356-1286, 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 5 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-356-1286 |
| Primary Part Number | 845-4558791 ITEM 24L1 |
| 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 |
| Stem Actuating End Type | SQUARE |
| Criticality Code Justification | ZZZY |
| Valve Size for Which Designed | 0.500 INCHES IN |
| Material | COPPER ALLOY |
| Reference Number Differentiating Characteristics | MATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I 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 |
| Part Number | Manufacturer |
|---|---|
| 845-4558791 ITEM 24L1 | Naval Inventory Control Point Mechanicsburg (USA) |
| 2643-852-01 ITEM 18L1 | Naval Inventory Control Point Mechanicsburg (USA) |
| 4558766-003AL1 | Naval Inventory Control Point Mechanicsburg (USA) |
| 2642-806-05 ITEM 3AL1 | Naval Inventory Control Point Mechanicsburg (USA) |
| 845-7286652 ITEM 18L1 | Naval Inventory Control Point Mechanicsburg (USA) |
| Reference | Meaning |
|---|---|
| 845-4558791 ITEM 24 | 3/1 Design control — primary reference U.S. Government activity |
| 2642-806-05 ITEM 3A | 5/1 Secondary reference U.S. Government activity |
| 4558766-003A | 5/1 Secondary reference U.S. Government activity |
| 2643-852-01 ITEM 18 | 5/1 Secondary reference U.S. Government activity |
| 845-7286652 ITEM 18 | 5/1 Secondary reference Naval Sea Systems Command |
NSN 4820-01-356-1286 is a Stem,fluid Valve, manufactured by Naval Inventory Control Point Mechanicsburg, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-356-1286 has 5 manufacturer part numbers on file: 845-4558791 ITEM 24L1 (Naval Inventory Control Point Mechanicsburg), 2643-852-01 ITEM 18L1 (Naval Inventory Control Point Mechanicsburg), 4558766-003AL1 (Naval Inventory Control Point Mechanicsburg), 2642-806-05 ITEM 3AL1 (Naval Inventory Control Point Mechanicsburg), 845-7286652 ITEM 18L1 (Naval Inventory Control Point Mechanicsburg).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-710-7724. Verify interchangeability with system specifications before substitution.
Key specifications for 845-4558791 ITEM 24L1: Valve Type for Which Designed: BALL; Stem Actuating End Type: SQUARE; Criticality Code Justification: ZZZY; 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 4820-01-356-1286 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.