The Ball,check, cataloged under National Stock Number 4820-01-524-5135, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Danfoss Inc. Government technical data includes 2 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. 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 | 4820-01-524-5135 |
| Primary Part Number | 689X1040 |
| Item Name | Ball,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Danfoss Inc |
| Status | ACTIVE |
| Valve Model Number for Which Designed | 49746 |
| Valve Design Control Activity | 60848 |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 4820-01-524-5135 is a Ball,check, manufactured by Danfoss Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-524-5135 has 2 manufacturer part numbers on file: 689X1040 (Danfoss Inc), 238974 (Allied Systems Company Dba Allied Systems Co).
1 possible match (shared part number, not a government interchangeability claim): 6545-01-612-2553. Verify interchangeability with system specifications before substitution.
Key specifications for 689X1040: Valve Model Number for Which Designed: 49746; Part Name Assigned by Controlling Agency: BALL; Valve Design Control Activity: 60848; End Item Identification: CONTROL VALVE ASSEMBLY. 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.
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.