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Technical Data Sheet
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A989 — Technical Data Sheet

✓ Verified by PartsTable
— · TAPERED BEARING
WHAT YOU NEED TO KNOW
Cup and cone sold separately — confirm both needed Timken series numbers indicate dimensions
Cup and cone NOT sold as set — verify order
PRODUCT OVERVIEW

CAPACITOR,FIXED,PAPER DIELECTRIC. Key specifications include helix_angle: 45.0000 DEGREES, gear_material: STEEL, overall_length: 1.250 INCHES NOMINAL IN, shaft_end_size: 1.875 INCHES IN, shaft_material: STEEL, teeth_quantity: 27. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System under NSN 3110-00-198-2443, 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
A989
NSN: 3110-00-198-2443
FSC: 3110
CAGE: 70801 — AUTOMOTIVE THRUST BEARING CORP (USA)
SPECIFICATIONS
helix_angle45.0000 DEGREES
gear_materialSTEEL
overall_length1.250 INCHES NOMINAL IN
shaft_end_size1.875 INCHES IN
shaft_materialSTEEL
teeth_quantity27
tooth_directionRIGHT
NSN3110-00-198-2443
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: A989 · 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
•
SURFACE FINISH: GROUND
•
BORE SMALLEST DIAMETER: 1.6250 INCHES MINIMUM AND 1.6260 INCHES MAXIMUM IN
•
THRUST DIRECTIONAL CAPABILITY DESIGNATION: SINGLE
•
ALIGNMENT TYPE: RIGID
•
OVERALL OUTSIDE DIAMETER: 3.1100 INCHES MINIMUM AND 3.1400 INCHES MAXIMUM IN
•
MATERIAL: COPPER ALLOY RETAINER
TYPICAL APPLICATIONS
  • RAID cache protection during power loss events
  • Write-back cache enablement for storage controllers
  • Enterprise server data integrity assurance
  • Hot-swap battery/capacitor replacement in production
TECHNICAL CHARACTERISTICS
SURFACE FINISHGROUND
BORE SMALLEST DIAMETER1.6250 INCHES MINIMUM AND 1.6260 INCHES MAXIMUM IN
THRUST DIRECTIONAL CAPABILITY DESIGNATIONSINGLE
ALIGNMENT TYPERIGID
OVERALL OUTSIDE DIAMETER3.1100 INCHES MINIMUM AND 3.1400 INCHES MAXIMUM IN
MATERIALCOPPER ALLOY RETAINER
MATERIALSTEEL WASHER
OVERALL HEIGHT0.7445 INCHES NOMINAL IN
STYLE DESIGNATORCLUTCH RELEASE, THRUST, LUBRICATED AND SEALED
MATERIALSTEEL BALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
20-2181InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
311-001-031InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
5905001410742InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
GP7766InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
R20838InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
18-8-1InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVEGOVERNMENT REGISTRY
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A989?
A989 is a CAPACITOR,FIXED,PAPER DIELECTRIC.
What parts can replace A989?
There are 15 known substitutes for A989: 20-2181, 311-001-031, 5905001410742 and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for A989?
A989 is cataloged in the Federal Logistics Information System under NSN 3110-00-198-2443. 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: September 2026