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Technical Data Sheet
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640878 — BEARING,BALL,DUPLEX

✓ Government record, cited
— · TAPERED BEARING
PRODUCT OVERVIEW

640878: BEARING,BALL,DUPLEX.

The BEARING,BALL,DUPLEX is a the manufacturer industrial component. Key specifications include end_item_identification: 3930-01-478-3519. This part is cataloged in the U.S.

Government catalog under NSN 3110-00-945-8304, 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
640878
NSN: 3110-00-945-8304
NIINs: 009458304, 014957492
FSC: 3110 — Bearings, Antifriction, Unmounted
CAGE: 62983 — EATON AEROSPACE, LLC DBA JACKSON SOUTH (USA)
SPECIFICATIONS
end_item_identification3930-01-478-3519
NSN3110-00-945-8304
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: 640878 · OEM ⚠ VERIFY BEFORE ORDERING Cup and cone sold separately — verify you are ordering BOTH parts or the correct component. Always replace cup and cone together — mismatched wear = premature failure ✓ BROKER TIP Taper angle determines axial load capacity. Steeper angle = higher axial load rating. Timken series numbers indicate dimensions — cross-reference carefully PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
RETAINER FABRICATION METHOD: MACHINED
•
INTERNAL CLEARANCE: 0.0020 INCHES MINIMUM RADIAL AND 0.0024 INCHES MAXIMUM RADIAL IN
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SURFACE FINISH: GROUND
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LOAD DIRECTION: RADIAL
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STANDARD TOLERANCE DESIGNATION: ABEC NO.5
•
MATERIAL: STEEL OUTER RING
TECHNICAL CHARACTERISTICS
RETAINER FABRICATION METHODMACHINED
INTERNAL CLEARANCE0.0020 INCHES MINIMUM RADIAL AND 0.0024 INCHES MAXIMUM RADIAL IN
SURFACE FINISHGROUND
LOAD DIRECTIONRADIAL
SPECIAL FEATURESPAIR OF BEARINGS,TANDEM MOUNTING
STANDARD TOLERANCE DESIGNATIONABEC NO.5
MATERIALSTEEL OUTER RING
MATERIALSTEEL INNER RING
MATERIALCOPPER ALLOY RETAINER
MATERIALSTEEL BALL
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 640878?
640878 is a BEARING,BALL,DUPLEX.
What is the NSN for 640878?
640878 is cataloged in the U.S. Government catalog under NSN 3110-00-945-8304. 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.