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B5590 — WINDOW,OBSERVATION

✓ Government record, cited
— · COMPONENT
PRODUCT OVERVIEW

B5590: WINDOW,OBSERVATION.

The WINDOW,OBSERVATION is a the manufacturer industrial component. Key specifications include material: GLASS, edge_type: FLAT FINISH, overall_diameter: 0.878 INCHES MINIMUM AND 0.879 INCHES MAXIMUM IN, style_designator: CIRCULAR, overall_thickness: 0.300 INCHES NOMINAL IN, fsc_application_data: GLASS FABRICATED MATERIALS. This part is cataloged in the U.S.

Government catalog under NSN 9340-00-447-1801, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
B5590
NSN: 9340-00-447-1801
FSC: 9340 — Glass Fabricated Materials
CAGE: 70925 — BIJUR LUBRICATING CORP (USA)
SPECIFICATIONS
materialGLASS
edge_typeFLAT FINISH
overall_diameter0.878 INCHES MINIMUM AND 0.879 INCHES MAXIMUM IN
style_designatorCIRCULAR
overall_thickness0.300 INCHES NOMINAL IN
fsc_application_dataGLASS FABRICATED MATERIALS
material_transparencyCLEAR
end_item_identificationRADAR SET,AN/UPS-1
insulating_air_space_material_arrangementMETAL TO GLASS
NSN9340-00-447-1801
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available WINDOW,OBSERVATION TITLE COMPONENT PN B5590 MFR WINDOW,OBSERVATION
KEY FEATURES
•
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
TECHNICAL CHARACTERISTICS
FSC APPLICATION DATAGLASS FABRICATED MATERIALS
INSULATING AIR SPACE MATERIAL ARRANGEMENTMETAL TO GLASS
OVERALL DIAMETER0.878 INCHES MINIMUM AND 0.879 INCHES MAXIMUM IN
OVERALL THICKNESS0.300 INCHES NOMINAL IN
MATERIAL TRANSPARENCYCLEAR
STYLE DESIGNATORCIRCULAR
EDGE TYPEFLAT FINISH
END ITEM IDENTIFICATIONRADAR SET,AN/UPS-1
MATERIALGLASS
OTHER ITEMS IN FSC 9340 — Glass Fabricated Materials
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
9340-00-001-2702 9340-00-001-3590 9340-00-001-3591 9340-00-001-3592 9340-00-003-0380 9340-00-003-1497 9340-00-003-1553 9340-00-003-7325
SUBSTITUTES & CROSS-REFERENCES 1
8991255-1Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is B5590?
B5590 is a WINDOW,OBSERVATION.
What parts can replace B5590?
There is 1 known substitute for B5590: 8991255-1. Substitute compatibility should be verified for your specific system.
What is the NSN for B5590?
B5590 is cataloged in the U.S. Government catalog under NSN 9340-00-447-1801. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.