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Technical Data Sheet
PartsTable / COMPONENT / MA12109
MA12109 ✓ 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

The RING,BEARING,INNER is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, bore_shape: STRAIGHT, bore_diameter: 1.7717 INCHES NOMINAL IN, overall_width: 0.7480 INCHES NOMINAL IN, surface_finish: GROUND, style_designator: INNER RING, ROLLER, CYLINDRICAL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-916-6468, 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
MA12109
NSN: 3110-00-916-6468
FSC: 3110
CAGE: 0LTL1 — NTN BEARING CORPORATION OF AMERICA (USA)
SPECIFICATIONS
materialSTEEL OVERALL
bore_shapeSTRAIGHT
bore_diameter1.7717 INCHES NOMINAL IN
overall_width0.7480 INCHES NOMINAL IN
surface_finishGROUND
style_designatorINNER RING, ROLLER, CYLINDRICAL
overall_outside_diameter2.1858 INCHES NOMINAL IN
standard_tolerance_designationRBEC NO.1
NSN3110-00-916-6468
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: MA12109 · 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
•
OVERALL OUTSIDE DIAMETER: 2.1858 INCHES NOMINAL IN
•
BORE SHAPE: STRAIGHT
•
STYLE DESIGNATOR: INNER RING, ROLLER, CYLINDRICAL
•
BORE DIAMETER: 1.7717 INCHES NOMINAL IN
•
MATERIAL: STEEL OVERALL
•
STANDARD TOLERANCE DESIGNATION: RBEC NO.1
•
SURFACE FINISH: GROUND
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL OUTSIDE DIAMETER2.1858 INCHES NOMINAL IN
BORE SHAPESTRAIGHT
STYLE DESIGNATORINNER RING, ROLLER, CYLINDRICAL
BORE DIAMETER1.7717 INCHES NOMINAL IN
MATERIALSTEEL OVERALL
OVERALL WIDTH0.7480 INCHES NOMINAL IN
STANDARD TOLERANCE DESIGNATIONRBEC NO.1
SURFACE FINISHGROUND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
1866-1Interchangeable
interchangeable cross-reference
interchangeable
6230-1Interchangeable
interchangeable cross-reference
interchangeable
BUNA-N-223Interchangeable
interchangeable cross-reference
interchangeable
A1200Interchangeable
interchangeable cross-reference
interchangeable
A1209Interchangeable
interchangeable cross-reference
interchangeable
2K5253Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MA12109?
MA12109 is a RING,BEARING,INNER.
What parts can replace MA12109?
There are 6 known substitutes for MA12109: 1866-1, 6230-1, BUNA-N-223 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MA12109?
MA12109 is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-916-6468. 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