The Disk,valve, cataloged under National Stock Number 4820-01-240-2001, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Mccay Tool and Engineering Company Dba Mccay Tool & Engineering Co. Government technical data includes 6 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-240-2001 |
| Primary Part Number | 75D141021-2001 |
| Item Name | Disk,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Mccay Tool and Engineering Company Dba Mccay Tool & Engineering Co |
| Status | ACTIVE |
| Shank Diameter | 1.750 INCHES NOMINAL IN |
| Flange Seat to Disk End Height | 0.600 INCHES NOMINAL IN |
| Outside Diameter | 3.500 INCHES NOMINAL IN |
| Style Designator | POPPET |
| Media for Which Designed | HYDRAULIC FLUID |
| Material | STEEL CORROSION RESISTING |
| 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 |
|---|---|
| 75D141021-2001 | The Boeing Company Div Defense (USA) |
| 75D141021-2001 PRIMARY | Mccay Tool and Engineering Company Dba Mccay Tool & Engineering Co (USA) |
| Reference | Meaning |
|---|---|
| 75D141021-2001 | 5/9 Secondary reference Pioneer Machine Products Inc. |
| 75D141021 | D/9 Drawing number reference only The Boeing Company Div Defense |
NSN 4820-01-240-2001 is a Disk,valve, manufactured by Mccay Tool and Engineering Company Dba Mccay Tool & Engineering Co, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-240-2001 has 2 manufacturer part numbers on file: 75D141021-2001 (The Boeing Company Div Defense), 75D141021-2001 (Mccay Tool and Engineering Company Dba Mccay Tool & Engineering Co).
Key specifications for 75D141021-2001: Shank Diameter: 1.750 INCHES NOMINAL IN; Flange Seat to Disk End Height: 0.600 INCHES NOMINAL IN; Overall Height: 1.000 INCHES NOMINAL IN; Outside Diameter: 3.500 INCHES NOMINAL IN. 6 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.