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Technical Data Sheet
PartsTable / COMPONENT / 28-778K
28-778K ✓ Verified by PartsTable
— · COMPONENT
WHAT YOU NEED TO KNOW
Verify manufacturer and server generation compatibility Check if Option PN or Spare PN — same part, different channel
Confirm exact part number — similar PNs may be different parts
PRODUCT OVERVIEW

The GLASS,SIGHT is a the manufacturer industrial component. Key specifications include material: ASBESTOS AND RUBBER NATURAL OR RUBBER SYNTHETIC OVERALL, outside_diameter: 2.250 INCHES NOMINAL IN, style_designator: CIRCULAR, aperture_diameter: 1.750 INCHES NOMINAL IN, cross-sectional_thickness: 0.062 INCHES NOMINAL IN, cross-sectional_shape_style: SOLID SINGLE OR COMPOSITION. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5975-01-198-3590, 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
28-778K
NSN: 5975-01-198-3590
FSC: 5975
CAGE: 66935 — JOHNSON CONTROLS NAVY SYSTEMS, LLC (USA)
SPECIFICATIONS
materialASBESTOS AND RUBBER NATURAL OR RUBBER SYNTHETIC OVERALL
outside_diameter2.250 INCHES NOMINAL IN
style_designatorCIRCULAR
aperture_diameter1.750 INCHES NOMINAL IN
cross-sectional_thickness0.062 INCHES NOMINAL IN
cross-sectional_shape_styleSOLID SINGLE OR COMPOSITION
material_document_and_classificationMIL-A-17472 MIL SPEC ALL MATERIAL RESPONSES OVERALL
NSN5975-01-198-3590
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available GLASS,SIGHT TITLE COMPONENT PN 28-778K MFR GLASS,SIGHT
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
BB58S59-21PC7Interchangeable
interchangeable cross-reference
interchangeable
BB58S59-31PC6Interchangeable
interchangeable cross-reference
interchangeable
190203PC6Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 28-778K?
28-778K is a GLASS,SIGHT.
What parts can replace 28-778K?
There are 3 known substitutes for 28-778K: BB58S59-21PC7, BB58S59-31PC6, 190203PC6. Substitute compatibility should be verified for your specific system.
What is the NSN for 28-778K?
28-778K is cataloged in the Federal Logistics Information System (FLIS) under NSN 5975-01-198-3590. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026