The Window,observation, cataloged under National Stock Number 9340-01-560-3522, is classified within Federal Supply Class 9340 (Glass Fabricated Materials) of the Nonmetallic Fabricated Materials group. Government technical data includes 2 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 9340-01-560-3522 |
| Item Name | Window,observation |
| FSC / FSG | 9340 / 93 — Glass Fabricated Materials |
| Status | ACTIVE |
| Style Designator | CIRCULAR |
| Material | GLASS BOROSILICATE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 910-F 1/2IN ITEM 4 | 5/9 Secondary reference Ernst Flow Industries |
| C2140 | 3/9 Design control — primary reference Ernst Flow Industries |
NSN 9340-01-560-3522 is a Window,observation, classified under FSC 9340, Glass Fabricated Materials. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 6680-01-660-0461. Verify interchangeability with system specifications before substitution.
Key specifications for 9340-01-560-3522: Style Designator: CIRCULAR; Part Name Assigned by Controlling Agency: (INAVY)BOROSILICATE CIRCLE; End Item Identification: 910-F 1/2" SIGHT FLOW INDICATOR; Material: GLASS BOROSILICATE. 2 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.