The Ball,check, cataloged under National Stock Number 4820-01-521-6399, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Huck International, Inc. Div Kingston Operations. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-521-6399 |
| Primary Part Number | 502506 |
| Item Name | Ball,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Huck International, Inc. Div Kingston Operations |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 502506 PRIMARY | Huck International, Inc. Div Kingston Operations (USA) |
NSN 4820-01-521-6399 is a Ball,check, manufactured by Huck International, Inc. Div Kingston Operations, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-521-6399 has 1 manufacturer part number on file: 502506 (Huck International, Inc. Div Kingston Operations).
Key specifications for 502506: Special Features: MODEL 256 CAN INSTALL UP TO 3/8 INCH STEEL HAGNA-GRIP FASTENERS, WEIGHT: 11.1 POUNDS LBS; End Item Identification: VALVE, BALL. 0 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.