The Window,observation, cataloged under National Stock Number 9340-01-179-2376, is classified within Federal Supply Class 9340 (Glass Fabricated Materials) of the Nonmetallic Fabricated Materials group. The manufacturer of record is Kaydon Custom Filtration Corporation. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Item Name | Window,observation |
| FSC / FSG | 9340 — Glass Fabricated Materials (FSG 93) |
| Manufacturers | Kaydon Custom Filtration Corporation (CAGE 53964) |
| Parameter | Value |
|---|---|
| NSN | 9340-01-179-2376 |
| Primary Part Number | 88521 |
| Item Name | Window,observation |
| FSC / FSG | 9340 / 93 — Glass Fabricated Materials |
| Manufacturer | Kaydon Custom Filtration Corporation |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Part Number | Manufacturer |
|---|---|
| 88521 PRIMARY | Kaydon Custom Filtration Corporation (USA) |
| Reference | Meaning |
|---|---|
| 88521 | 5/9 Secondary reference Kaydon Corporation Dba Kaydon Filtration Group |
NSN 9340-01-179-2376 is a Window,observation, manufactured by Kaydon Custom Filtration Corporation, classified under FSC 9340, Glass Fabricated Materials. Status: active.
NSN 9340-01-179-2376 has 1 manufacturer part number on file: 88521 (Kaydon Custom Filtration Corporation).
2 possible matches (shared part number, not a government interchangeability claim): 6105-01-196-6374, 4820-01-232-6002. Verify interchangeability with system specifications before substitution.
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.