The Plug,balance, cataloged under National Stock Number 4820-01-121-1937, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Fisher Controls Co Inc. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-121-1937 |
| Primary Part Number | 2DA3507X052 |
| Item Name | Plug,balance |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Fisher Controls Co Inc |
| Status | ACTIVE |
| General Characteristics Item Description | BRONZE |
| 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 |
|---|---|
| 2DA3507X052 PRIMARY | Fisher Controls Co Inc (USA) |
| 42A3444 PIECE 41 | Fisher Controls Co Inc (USA) |
| Reference | Meaning |
|---|---|
| 42A3444 | D/9 Drawing number reference only Fisher Controls Co Inc |
| 20A3507X052 | C/1 Advisory reference — outside the item-of-supply concept Fisher Controls Co Inc |
NSN 4820-01-121-1937 is a Plug,balance, manufactured by Fisher Controls Co Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-121-1937 has 2 manufacturer part numbers on file: 2DA3507X052 (Fisher Controls Co Inc), 42A3444 PIECE 41 (Fisher Controls Co Inc).
2 possible matches (shared part number, not a government interchangeability claim): 4820-01-121-2450, 4820-01-333-1276. Verify interchangeability with system specifications before substitution.
Key specifications for 2DA3507X052: General Characteristics Item Description: BRONZE. 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.