The Stem,fluid Valve, cataloged under National Stock Number 4820-01-429-1276, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 6 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-429-1276 |
| Primary Part Number | 556-6408987 FIND B-6 |
| Item Name | Stem,fluid Valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Valve Type for Which Designed | BALL |
| Stem Actuating End Type | THREADED EXTERNALLY |
| Material Document and Classification | QQ-C-465 ALLOY C63200 FED SPEC SINGLE MATERIAL RESPONSE |
| Features Provided | SPECIAL MARKING |
| Valve Size for Which Designed | 1.000 INCHES IN |
| Material | COPPER ALLOY |
| 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 |
|---|---|
| 556-6408987 FIND B-6 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 6408987 | D/9 Drawing number reference only Naval Sea Systems Command |
| 2643-787-01 FN B-6 | 5/9 Secondary reference U.S. Government activity |
NSN 4820-01-429-1276 is a Stem,fluid Valve, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-429-1276 has 1 manufacturer part number on file: 556-6408987 FIND B-6 (Naval Sea Systems Command).
3 possible matches (shared part number, not a government interchangeability claim): 4820-01-429-2492, 4730-01-432-9230, 4820-01-442-3077. Verify interchangeability with system specifications before substitution.
Key specifications for 556-6408987 FIND B-6: Valve Type for Which Designed: BALL; Stem Actuating End Type: THREADED EXTERNALLY; Material Document and Classification: QQ-C-465 ALLOY C63200 FED SPEC SINGLE MATERIAL RESPONSE; Overall Length: 4.250 INCHES NOMINAL 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.