The Window,observation, cataloged under National Stock Number 9340-01-442-1663, is classified within Federal Supply Class 9340 (Glass Fabricated Materials) of the Nonmetallic Fabricated Materials group. The manufacturer of record is L3 Technologies, Inc.. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 9340-01-442-1663 |
| Primary Part Number | A-20041 |
| Item Name | Window,observation |
| FSC / FSG | 9340 / 93 — Glass Fabricated Materials |
| Manufacturer | L3 Technologies, Inc. |
| Status | ACTIVE |
| Overall Diameter | 7.656 INCHES MINIMUM AND 7.781 INCHES MAXIMUM IN |
| Surface Finish | GROUND |
| Overall Thickness | 0.375 INCHES NOMINAL IN |
| Material Transparency | CLEAR |
| Style Designator | CIRCULAR |
| Ply Quantity | 1 |
| Material | GLASS |
| 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 |
|---|---|
| A-20041 PRIMARY | L3 Technologies, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 10-1928-1 ITEM NO. 6 | 5/9 Secondary reference L3 Technologies, Inc. |
NSN 9340-01-442-1663 is a Window,observation, manufactured by L3 Technologies, Inc., classified under FSC 9340, Glass Fabricated Materials. Status: active.
NSN 9340-01-442-1663 has 1 manufacturer part number on file: A-20041 (L3 Technologies, Inc.).
1 possible match (shared part number, not a government interchangeability claim): 5340-01-642-7899. Verify interchangeability with system specifications before substitution.
Key specifications for A-20041: Overall Diameter: 7.656 INCHES MINIMUM AND 7.781 INCHES MAXIMUM IN; Surface Finish: GROUND; Overall Thickness: 0.375 INCHES NOMINAL IN; Material Transparency: CLEAR. 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.