The Ball,check, cataloged under National Stock Number 4820-01-522-4218, 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 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-522-4218 |
| Primary Part Number | 801-6405342 FIND 41, 11CP |
| Item Name | Ball,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Inventory Control Point Mechanicsburg |
| Status | ACTIVE |
| Spherical Diameter | 1.060 INCHES NOMINAL IN |
| Valve Model Number for Which Designed | 6405342 ASSY 95 |
| Criticality Code Justification | ZZZY |
| Valve Size for Which Designed | 0.500 INCHES IN |
| Valve Design Control Activity | 53711 |
| Reference Number Differentiating Characteristics | CLEANING, PACKAGING, AND MARKING IAW THE LATEST REVISION OF MIL-STD-1330 |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Part Number | Manufacturer |
|---|---|
| 801-6405342 FIND 41, 11CP | Naval Inventory Control Point Mechanicsburg (USA) |
| 211096017/211081997CP | Naval Inventory Control Point Mechanicsburg (USA) |
| Reference | Meaning |
|---|---|
| 211096017/211081997 | 3/1 Design control — primary reference Naval Sea Systems Command |
| 801-6405342 FIND 41,11 | 5/1 Secondary reference Naval Sea Systems Command |
NSN 4820-01-522-4218 is a Ball,check, manufactured by Naval Inventory Control Point Mechanicsburg, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-522-4218 has 2 manufacturer part numbers on file: 801-6405342 FIND 41, 11CP (Naval Inventory Control Point Mechanicsburg), 211096017/211081997CP (Naval Inventory Control Point Mechanicsburg).
2 possible matches (shared part number, not a government interchangeability claim): 4820-01-534-9797, 4820-01-537-8232. Verify interchangeability with system specifications before substitution.
Key specifications for 801-6405342 FIND 41, 11CP: Spherical Diameter: 1.060 INCHES NOMINAL IN; Valve Model Number for Which Designed: 6405342 ASSY 95; 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.
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.