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Technical Data Sheet
PartsTable / COMPONENT / T1389A
T1389A ✓ 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

CONE AND ROLLERS,TAPERED ROLLER. Key specifications include material: STEEL OVERALL, cone_width: 0.8640 INCHES NOMINAL IN, bore_diameter: 2.1250 INCHES NOMINAL IN, style_designator: NORMAL ANGLE, cone_corner_radius: 0.0312 INCHES NOMINAL IN, standard_tolerance_designation: AFBMA CLASS 2. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-142-4359, 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
T1389A
NSN: 3110-00-142-4359
FSC: 3110
CAGE: 09605 — BOMAG USA SUB OF UNITED DOMINION INDUSTRIES LTD (USA)
SPECIFICATIONS
materialSTEEL OVERALL
cone_width0.8640 INCHES NOMINAL IN
bore_diameter2.1250 INCHES NOMINAL IN
style_designatorNORMAL ANGLE
cone_corner_radius0.0312 INCHES NOMINAL IN
standard_tolerance_designationAFBMA CLASS 2
NSN3110-00-142-4359
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: T1389A · 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
•
MATERIAL: STEEL OVERALL
•
STYLE DESIGNATOR: NORMAL ANGLE
•
CONE WIDTH: 0.8640 INCHES NOMINAL IN
•
STANDARD TOLERANCE DESIGNATION: AFBMA CLASS 2
•
BORE DIAMETER: 2.1250 INCHES NOMINAL IN
•
CONE CORNER RADIUS: 0.0312 INCHES NOMINAL IN
TYPICAL APPLICATIONS
  • Long-term data archival and compliance retention
  • Offsite backup and disaster recovery
  • Air-gapped ransomware protection
  • Cold storage tier for infrequently accessed data
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALSTEEL OVERALL
STYLE DESIGNATORNORMAL ANGLE
CONE WIDTH0.8640 INCHES NOMINAL IN
STANDARD TOLERANCE DESIGNATIONAFBMA CLASS 2
BORE DIAMETER2.1250 INCHES NOMINAL IN
CONE CORNER RADIUS0.0312 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 11
389AInterchangeable
interchangeable cross-reference
interchangeable
ES398AInterchangeable
interchangeable cross-reference
interchangeable
EE35980Interchangeable
interchangeable cross-reference
interchangeable
391BInterchangeable
interchangeable cross-reference
interchangeable
390AInterchangeable
interchangeable cross-reference
interchangeable
CVC MULTIMETERInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is T1389A?
T1389A is a CONE AND ROLLERS,TAPERED ROLLER.
What parts can replace T1389A?
There are 11 known substitutes for T1389A: 389A, ES398A, EE35980 and 8 more. Substitute compatibility should be verified for your specific system.
What is the NSN for T1389A?
T1389A is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-142-4359. 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