The Window,observation, cataloged under National Stock Number 9340-00-643-1654, is classified within Federal Supply Class 9340 (Glass Fabricated Materials) of the Nonmetallic Fabricated Materials group. The manufacturer of record is Raytheon Company Div Corp. Government technical data includes 5 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 9340-00-643-1654 |
| Primary Part Number | 3K1L27 |
| Item Name | Window,observation |
| FSC / FSG | 9340 / 93 — Glass Fabricated Materials |
| Manufacturer | Raytheon Company Div Corp |
| Status | ACTIVE |
| Overall Diameter | 2.078 INCHES NOMINAL IN |
| Overall Thickness | 0.125 INCHES NOMINAL IN |
| Material Transparency | CLEAR |
| Style Designator | HALF ROUND |
| 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 |
|---|---|
| 3K1L27 PRIMARY | Raytheon Company Div Corp (USA) |
| Reference | Meaning |
|---|---|
| 3K1L27P1 | C/1 Advisory reference — outside the item-of-supply concept Zf Industrieantriebe Witten Gmbh |
NSN 9340-00-643-1654 is a Window,observation, manufactured by Raytheon Company Div Corp, classified under FSC 9340, Glass Fabricated Materials. Status: active.
NSN 9340-00-643-1654 has 1 manufacturer part number on file: 3K1L27 (Raytheon Company Div Corp).
Key specifications for 3K1L27: Overall Diameter: 2.078 INCHES NOMINAL IN; Overall Thickness: 0.125 INCHES NOMINAL IN; Material Transparency: CLEAR; Style Designator: HALF ROUND. 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.