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8477K42 — WINDOW,OBSERVATION

✓ Government record, cited
— · COMPONENT
PRODUCT OVERVIEW

8477K42: WINDOW,OBSERVATION.

The WINDOW,OBSERVATION is a the manufacturer industrial component. Key specifications include material: GLASS BOROSILICATE, edge_type: FLAT FINISH, surface_finish: FIRE FINISH, overall_diameter: 2.000 INCHES NOMINAL IN, style_designator: CIRCULAR, overall_thickness: 0.375 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 9340-01-444-1698, 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
8477K42
NSN: 9340-01-444-1698
FSC: 9340 — Glass Fabricated Materials
CAGE: 39428 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
materialGLASS BOROSILICATE
edge_typeFLAT FINISH
ply_quantity1
surface_finishFIRE FINISH
overall_diameter2.000 INCHES NOMINAL IN
style_designatorCIRCULAR
overall_thickness0.375 INCHES NOMINAL IN
material_transparencyCLEAR
environmental_protectionHIGH TEMPERATURE RESISTANT
temp_at_maximum_operating_pressure446.0 FAHRENHEIT DEGF
NSN9340-01-444-1698
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available WINDOW,OBSERVATION TITLE COMPONENT PN 8477K42 MFR WINDOW,OBSERVATION
KEY FEATURES
•
OVERALL DIAMETER: 2.000 INCHES NOMINAL IN
•
SURFACE FINISH: FIRE FINISH
•
OVERALL THICKNESS: 0.375 INCHES NOMINAL IN
•
MATERIAL TRANSPARENCY: CLEAR
•
STYLE DESIGNATOR: CIRCULAR
•
TEMP AT MAXIMUM OPERATING PRESSURE: 446.0 FAHRENHEIT DEGF
•
EDGE TYPE: FLAT FINISH
•
PLY QUANTITY: 1
TECHNICAL CHARACTERISTICS
OVERALL DIAMETER2.000 INCHES NOMINAL IN
SURFACE FINISHFIRE FINISH
OVERALL THICKNESS0.375 INCHES NOMINAL IN
MATERIAL TRANSPARENCYCLEAR
STYLE DESIGNATORCIRCULAR
TEMP AT MAXIMUM OPERATING PRESSURE446.0 FAHRENHEIT DEGF
EDGE TYPEFLAT FINISH
PLY QUANTITY1
ENVIRONMENTAL PROTECTIONHIGH TEMPERATURE RESISTANT
MATERIALGLASS BOROSILICATE
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

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 8477K42?
8477K42 is a WINDOW,OBSERVATION.
What is the NSN for 8477K42?
8477K42 is cataloged in the U.S. Government catalog under NSN 9340-01-444-1698. 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.