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1870403 — WINDOW,OBSERVATION

✓ Government record, cited
— · COMPONENT
PRODUCT OVERVIEW

1870403: WINDOW,OBSERVATION.

The WINDOW,OBSERVATION is a the manufacturer industrial component. Key specifications include material: GLASS SAFETY, edge_type: FLAT FINISH, surface_finish: POLISHED, overall_diameter: 2.617 INCHES MINIMUM AND 2.620 INCHES MAXIMUM IN, special_features: WHITE LINE 0.020 IN. W THROUGH CENTER 0.750 IN.

LG IN, style_designator: CIRCULAR. This part is cataloged in the U.S. Government catalog under NSN 9340-00-684-0873, 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
1870403
NSN: 9340-00-684-0873
FSC: 9340 — Glass Fabricated Materials
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
materialGLASS SAFETY
edge_typeFLAT FINISH
ply_quantity1
surface_finishPOLISHED
overall_diameter2.617 INCHES MINIMUM AND 2.620 INCHES MAXIMUM IN
special_featuresWHITE LINE 0.020 IN. W THROUGH CENTER 0.750 IN. LG IN
style_designatorCIRCULAR
overall_thickness0.250 INCHES NOMINAL IN
material_transparencyCLEAR
environmental_protectionSHATTER PROOF
material_document_and_classificationDD-G-451 FED SPEC SINGLE MATERIAL RESPONSE
NSN9340-00-684-0873
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available WINDOW,OBSERVATION TITLE COMPONENT PN 1870403 MFR WINDOW,OBSERVATION
KEY FEATURES
•
OVERALL DIAMETER: 2.617 INCHES MINIMUM AND 2.620 INCHES MAXIMUM IN
•
SURFACE FINISH: POLISHED
•
OVERALL THICKNESS: 0.250 INCHES NOMINAL IN
•
MATERIAL TRANSPARENCY: CLEAR
•
STYLE DESIGNATOR: CIRCULAR
•
MATERIAL DOCUMENT AND CLASSIFICATION: DD-G-451 FED SPEC SINGLE MATERIAL RESPONSE
•
EDGE TYPE: FLAT FINISH
•
PLY QUANTITY: 1
TECHNICAL CHARACTERISTICS
OVERALL DIAMETER2.617 INCHES MINIMUM AND 2.620 INCHES MAXIMUM IN
SURFACE FINISHPOLISHED
OVERALL THICKNESS0.250 INCHES NOMINAL IN
MATERIAL TRANSPARENCYCLEAR
STYLE DESIGNATORCIRCULAR
MATERIAL DOCUMENT AND CLASSIFICATIONDD-G-451 FED SPEC SINGLE MATERIAL RESPONSE
EDGE TYPEFLAT FINISH
PLY QUANTITY1
SPECIAL FEATURESWHITE LINE 0.020 IN. W THROUGH CENTER 0.750 IN. LG IN
ENVIRONMENTAL PROTECTIONSHATTER PROOF
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: Terminal item — stock exhausted; no further procurementNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 1870403?
1870403 is a WINDOW,OBSERVATION.
What is the NSN for 1870403?
1870403 is cataloged in the U.S. Government catalog under NSN 9340-00-684-0873. 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.