PartsTable
Technical Data Sheet
Download PDF

BL81204 — WINDOW,OBSERVATION

✓ Government record, cited
— · COMPONENT
PRODUCT OVERVIEW

BL81204: WINDOW,OBSERVATION.

The WINDOW,OBSERVATION is a the manufacturer industrial component. Key specifications include material: GLASS, edge_type: FLAT FINISH, surface_finish: FIRE FINISH, overall_diameter: 5.811 INCHES MINIMUM AND 5.843 INCHES MAXIMUM IN, special_features: CENTER 3 IN. DIA AREA SHALL BE TOTALLY FREE OF IMPERFECTIONS VISIBLE TO THE UNAIDED EYE IN, style_designator: CIRCULAR.

This part is cataloged in the U.S. Government catalog under NSN 9340-00-265-9689, 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
BL81204
NSN: 9340-00-265-9689
FSC: 9340 — Glass Fabricated Materials
CAGE: 64959 — AMERICAN TELEPHONE AND TELEGRAPH CO (USA)
SPECIFICATIONS
materialGLASS
edge_typeFLAT FINISH
ply_quantity2
surface_finishFIRE FINISH
overall_diameter5.811 INCHES MINIMUM AND 5.843 INCHES MAXIMUM IN
special_featuresCENTER 3 IN. DIA AREA SHALL BE TOTALLY FREE OF IMPERFECTIONS VISIBLE TO THE UNAIDED EYE IN
style_designatorCIRCULAR
overall_thickness0.281 INCHES MINIMUM AND 0.344 INCHES MAXIMUM IN
fsc_application_dataRANGE INDICATOR TYPE NO. IP107/SPS-48
material_transparencyCLEAR
NSN9340-00-265-9689
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available WINDOW,OBSERVATION TITLE COMPONENT PN BL81204 MFR WINDOW,OBSERVATION
KEY FEATURES
•
FSC APPLICATION DATA: RANGE INDICATOR TYPE NO. IP107/SPS-48
•
OVERALL DIAMETER: 5.811 INCHES MINIMUM AND 5.843 INCHES MAXIMUM IN
•
SURFACE FINISH: FIRE FINISH
•
OVERALL THICKNESS: 0.281 INCHES MINIMUM AND 0.344 INCHES MAXIMUM IN
•
MATERIAL TRANSPARENCY: CLEAR
•
STYLE DESIGNATOR: CIRCULAR
•
EDGE TYPE: FLAT FINISH
•
PLY QUANTITY: 2
TECHNICAL CHARACTERISTICS
FSC APPLICATION DATARANGE INDICATOR TYPE NO. IP107/SPS-48
OVERALL DIAMETER5.811 INCHES MINIMUM AND 5.843 INCHES MAXIMUM IN
SURFACE FINISHFIRE FINISH
OVERALL THICKNESS0.281 INCHES MINIMUM AND 0.344 INCHES MAXIMUM IN
MATERIAL TRANSPARENCYCLEAR
STYLE DESIGNATORCIRCULAR
EDGE TYPEFLAT FINISH
PLY QUANTITY2
SPECIAL FEATURESCENTER 3 IN. DIA AREA SHALL BE TOTALLY FREE OF IMPERFECTIONS VISIBLE TO THE UNAIDED EYE IN
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
671849Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
Ready to buy BL81204?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is BL81204?
BL81204 is a WINDOW,OBSERVATION.
What parts can replace BL81204?
There is 1 known substitute for BL81204: 671849. Substitute compatibility should be verified for your specific system.
What is the NSN for BL81204?
BL81204 is cataloged in the U.S. Government catalog under NSN 9340-00-265-9689. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — BL81204

✓ 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.