The Valve,flow Control, cataloged under National Stock Number 4820-01-031-4338, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is U S Army Tank Automotive Command Amsta-Im-Mm. Government technical data includes 7 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-031-4338 |
| Primary Part Number | 11621558 |
| Item Name | Valve,flow Control |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| Flow Control Device | DISK |
| Connection Type | THREADED EXTERNAL TUBE |
| Nominal Thread Size | 0.438 INCHES IN |
| Body Material | COPPER ALLOY AND ZINC |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 20 |
| Thread Series Designator | UNF |
| 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 |
|---|---|
| 11621558 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| Reference | Meaning |
|---|---|
| 138-4B | 5/9 Secondary reference U.S. Government activity |
| 10086271 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| 102367 | 5/9 Secondary reference Mil-Tech Mfg Inc |
NSN 4820-01-031-4338 is a Valve,flow Control, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-031-4338 has 1 manufacturer part number on file: 11621558 (U S Army Tank Automotive Command Amsta-Im-Mm).
2 possible matches (shared part number, not a government interchangeability claim): 3020-01-310-1223, 6660-01-497-9184. Verify interchangeability with system specifications before substitution.
Key specifications for 11621558: Flow Control Device: DISK; Connection Type: THREADED EXTERNAL TUBE; Nominal Thread Size: 0.438 INCHES IN; Body Material: COPPER ALLOY AND ZINC. 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.