The Stem,fluid Valve, cataloged under National Stock Number 4820-01-407-0789, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Derbyshire Machine & Tool Co. Government technical data includes 5 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-407-0789 |
| Primary Part Number | 90-D-181-8 |
| Item Name | Stem,fluid Valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Derbyshire Machine & Tool Co |
| Status | ACTIVE |
| Valve Type for Which Designed | ANGLE |
| Largest Outside Diameter | 1.250 INCHES NOMINAL IN |
| Stem Actuating End Type | THREADED INTERNALLY |
| Valve Size for Which Designed | 2.000 INCHES IN |
| Material | NICKEL 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 |
|---|---|
| 90-D-181-8 PRIMARY | Derbyshire Machine & Tool Co (USA) |
| 90-D-181 PC 8 | Derbyshire Machine & Tool Co (USA) |
| Reference | Meaning |
|---|---|
| 90-D-181 | D/9 Drawing number reference only Derbyshire Machine & Tool Co |
NSN 4820-01-407-0789 is a Stem,fluid Valve, manufactured by Derbyshire Machine & Tool Co, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-407-0789 has 2 manufacturer part numbers on file: 90-D-181-8 (Derbyshire Machine & Tool Co), 90-D-181 PC 8 (Derbyshire Machine & Tool Co).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-407-0791. Verify interchangeability with system specifications before substitution.
Key specifications for 90-D-181-8: Valve Type for Which Designed: ANGLE; Largest Outside Diameter: 1.250 INCHES NOMINAL IN; Stem Actuating End Type: THREADED INTERNALLY; Overall Length: 11.313 INCHES NOMINAL IN. 5 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.