The Stem,fluid Valve, cataloged under National Stock Number 4820-01-256-9097, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Steward Machine Co Inc. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-256-9097 |
| Primary Part Number | 642-489 |
| Item Name | Stem,fluid Valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Steward Machine Co Inc |
| Status | ACTIVE |
| Material | STEEL |
| 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 |
|---|---|
| 642-489 PRIMARY | Steward Machine Co Inc (USA) |
| Reference | Meaning |
|---|---|
| 60-642 PC489 | 5/9 Secondary reference Hardie-Tynes Co., Inc. |
| 642-489 | 5/9 Secondary reference Hardie-Tynes Co., Inc. |
| 60-642 | D/9 Drawing number reference only Hardie-Tynes Co., Inc. |
NSN 4820-01-256-9097 is a Stem,fluid Valve, manufactured by Steward Machine Co Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-256-9097 has 1 manufacturer part number on file: 642-489 (Steward Machine Co Inc).
3 possible matches (shared part number, not a government interchangeability claim): 4820-01-256-9098, 4130-01-261-4633, 6210-01-725-3693. Verify interchangeability with system specifications before substitution.
Key specifications for 642-489: Overall Length: 3.312 INCHES NOMINAL IN; Material: STEEL. 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.