The Disk,valve, cataloged under National Stock Number 4820-01-121-6406, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Hunt Valve Company, Inc.. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 9 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 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 | 4820-01-121-6406 |
| Primary Part Number | 400456 |
| Item Name | Disk,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Hunt Valve Company, Inc. |
| Status | ACTIVE |
| Outside Diameter | 0.750 INCHES NOMINAL IN |
| 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 |
|---|---|
| C522-1-B ITEM 17 | Hunt Valve Company, Inc. (USA) |
| C422-0-B ITEM 17 | Hunt Valve Company, Inc. (USA) |
| C422-1-B ITEM 17 | Hunt Valve Company, Inc. (USA) |
| C322-1-B PIECE 17 | Hunt Valve Company, Inc. (USA) |
| 400456 PRIMARY | Hunt Valve Company, Inc. (USA) |
| C522-1-B PIECE 17 | Hunt Valve Company, Inc. (USA) |
| C222-1-B ITEM 17 | Hunt Valve Company, Inc. (USA) |
| C522-0-B PIECE 17 | Hunt Valve Company, Inc. (USA) |
| C522-0-B ITEM 17 | Hunt Valve Company, Inc. (USA) |
NSN 4820-01-121-6406 is a Disk,valve, manufactured by Hunt Valve Company, Inc., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-121-6406 has 9 manufacturer part numbers on file: C522-1-B ITEM 17 (Hunt Valve Company, Inc.), C422-0-B ITEM 17 (Hunt Valve Company, Inc.), C422-1-B ITEM 17 (Hunt Valve Company, Inc.), C322-1-B PIECE 17 (Hunt Valve Company, Inc.), 400456 (Hunt Valve Company, Inc.) and 4 more.
2 possible matches (shared part number, not a government interchangeability claim): 6525-01-428-1558, 4730-01-542-5377. Verify interchangeability with system specifications before substitution.
Key specifications for 400456: Overall Height: 1.055 INCHES NOMINAL IN; Outside Diameter: 0.750 INCHES NOMINAL IN; Special Features: COBALT ALLOY,ASTM A567,GRADE 1. 1 specification is 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.