The Window,observation, cataloged under National Stock Number 9340-00-447-1801, is classified within Federal Supply Class 9340 (Glass Fabricated Materials) of the Nonmetallic Fabricated Materials group. The manufacturer of record is Bijur Lubricating Corp. Government technical data includes 8 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 9340-00-447-1801 |
| Primary Part Number | B5590 |
| Item Name | Window,observation |
| FSC / FSG | 9340 / 93 — Glass Fabricated Materials |
| Manufacturer | Bijur Lubricating Corp |
| Status | ACTIVE |
| FSC Application Data | GLASS FABRICATED MATERIALS |
| Insulating Air Space Material Arrangement | METAL TO GLASS |
| Overall Diameter | 0.878 INCHES MINIMUM AND 0.879 INCHES MAXIMUM IN |
| Overall Thickness | 0.300 INCHES NOMINAL IN |
| Material Transparency | CLEAR |
| Style Designator | CIRCULAR |
| Edge Type | FLAT FINISH |
| 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 |
|---|---|
| B5590 PRIMARY | Bijur Lubricating Corp (USA) |
| Reference | Meaning |
|---|---|
| 8991255-1 | 5/9 Secondary reference Lockheed Martin Corporation Dba Lockheed Martin Div Lockheed Martin |
| 8991255-1 | 5/9 Secondary reference Lockheed Martin Corporation Div Rms |
NSN 9340-00-447-1801 is a Window,observation, manufactured by Bijur Lubricating Corp, classified under FSC 9340, Glass Fabricated Materials. Status: active.
NSN 9340-00-447-1801 has 1 manufacturer part number on file: B5590 (Bijur Lubricating Corp).
Key specifications for B5590: FSC Application Data: GLASS FABRICATED MATERIALS; Insulating Air Space Material Arrangement: METAL TO GLASS; Overall Diameter: 0.878 INCHES MINIMUM AND 0.879 INCHES MAXIMUM IN; Overall Thickness: 0.300 INCHES NOMINAL IN. 8 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.