The Cap,valve, cataloged under National Stock Number 4820-01-421-8094, 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 7 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-421-8094 |
| Primary Part Number | 211061031 |
| Item Name | Cap,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Valve Type for Which Designed | BALL |
| Material Document and Classification | QQ-N-281, CL A, FORM 1, COND HF FED SPEC SINGLE MATERIAL RESPONSE |
| Outside Diameter | 12.300 INCHES NOMINAL IN |
| Valve Size for Which Designed | 4.000 INCHES IN |
| Height | 2.973 INCHES MINIMUM AND 2.983 INCHES MAXIMUM IN |
| Material | NICKEL ALLOY |
| Attachment Method | BOLTS |
| 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 |
|---|---|
| 801-6404929 IT 35 | Naval Sea Systems Command (USA) |
| 211061031 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 6404929 | D/9 Drawing number reference only Naval Sea Systems Command |
| DF330633 FN-35 | 5/9 Secondary reference Huntington Ingalls Inc Div Newport News Shipbuilding |
NSN 4820-01-421-8094 is a Cap,valve, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-421-8094 has 2 manufacturer part numbers on file: 801-6404929 IT 35 (Naval Sea Systems Command), 211061031 (Naval Sea Systems Command).
2 possible matches (shared part number, not a government interchangeability claim): 4820-01-435-1830, 4820-01-461-2981. Verify interchangeability with system specifications before substitution.
Key specifications for 211061031: Valve Type for Which Designed: BALL; Material Document and Classification: QQ-N-281, CL A, FORM 1, COND HF FED SPEC SINGLE MATERIAL RESPONSE; Outside Diameter: 12.300 INCHES NOMINAL IN; Valve Size for Which Designed: 4.000 INCHES IN. 7 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.