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645285 — RING ASSEMBLY,ELECTRICAL CONTACT

✓ Government record, cited
— · COMPONENT
PRODUCT OVERVIEW

645285: RING ASSEMBLY,ELECTRICAL CONTACT.

RING ASSEMBLY,ELECTRICAL CONTACT. Key specifications include width: 0.313 INCHES NOMINAL IN, diameter: 5.188 INCHES NOMINAL IN, overall_height: 4.125 INCHES NOMINAL IN, overall_diameter: 5.375 INCHES NOMINAL IN, fsc_application_data: COMPASS,GYRO, mounting_configuration: SIX 0.125 IN. DIA MTG HOLES EQUALLY SPACED ON 4.625 IN.

DIA BOLT CIRCLE IN. This part is cataloged in the U.S. Government catalog under NSN 5977-00-504-5408, 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
645285
NSN: 5977-00-504-5408
FSC: 5977 — Electrical Contact Brushes and Electrodes
CAGE: 56232 — LOCKHEED MARTIN CORPORATION DIV RMS - MITCHEL FIELD (USA)
SPECIFICATIONS
width0.313 INCHES NOMINAL IN
diameter5.188 INCHES NOMINAL IN
overall_height4.125 INCHES NOMINAL IN
overall_diameter5.375 INCHES NOMINAL IN
fsc_application_dataCOMPASS,GYRO
contact_ring_quantity5
mounting_configurationSIX 0.125 IN. DIA MTG HOLES EQUALLY SPACED ON 4.625 IN. DIA BOLT CIRCLE IN
NSN5977-00-504-5408
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available RING ASSEMBLY,ELECTRICAL CONTACT TITLE COMPONENT PN 645285 MFR RING ASSEMBLY,ELECTRIC
KEY FEATURES
•
FSC APPLICATION DATA: COMPASS,GYRO
•
OVERALL DIAMETER: 5.375 INCHES NOMINAL IN
•
DIAMETER: 5.188 INCHES NOMINAL IN
•
MOUNTING CONFIGURATION: SIX 0.125 IN. DIA MTG HOLES EQUALLY SPACED ON 4.625 IN. DIA BOLT CIRCLE IN
•
WIDTH: 0.313 INCHES NOMINAL IN
•
CONTACT RING QUANTITY: 5
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT4.125 INCHES NOMINAL IN
FSC APPLICATION DATACOMPASS,GYRO
OVERALL DIAMETER5.375 INCHES NOMINAL IN
DIAMETER5.188 INCHES NOMINAL IN
MOUNTING CONFIGURATIONSIX 0.125 IN. DIA MTG HOLES EQUALLY SPACED ON 4.625 IN. DIA BOLT CIRCLE IN
WIDTH0.313 INCHES NOMINAL IN
CONTACT RING QUANTITY5
OTHER ITEMS IN FSC 5977 — Electrical Contact Brushes and Electrodes
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5977-00-001-8018 5977-00-001-8867 5977-00-002-9654 5977-00-003-0257 5977-00-003-0258 5977-00-003-0264 5977-00-003-1196 5977-00-003-1197
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 645285?
645285 is a RING ASSEMBLY,ELECTRICAL CONTACT.
What is the NSN for 645285?
645285 is cataloged in the U.S. Government catalog under NSN 5977-00-504-5408. 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.