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Technical Data Sheet
PartsTable / COMPONENT / 55BA03
55BA03 ✓ 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 BEARING,BALL,ANNULAR is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, bore_shape: STRAIGHT, bore_diameter: 55.00 MILLIMETERS NOMINAL MM, contact_angle: 25.0 DEGREES MINIMUM, overall_width: 29.0 MILLIMETERS NOMINAL MM, load_direction: ANGULAR. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-156-8137, 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
55BA03
NSN: 3110-00-156-8137
FSC: 3110
CAGE: 70413 — ANTI-FRICTION BEARING MFG ASSN INC THE (USA)
SPECIFICATIONS
materialSTEEL OVERALL
bore_shapeSTRAIGHT
bore_diameter55.00 MILLIMETERS NOMINAL MM
contact_angle25.0 DEGREES MINIMUM
overall_width29.0 MILLIMETERS NOMINAL MM
load_directionANGULAR
surface_finishGROUND
style_designatorCOUNTERBORED OUTER RING, NON-SEPARABLE
overall_outside_diameter120.00 MILLIMETERS NOMINAL MM
internal_fit-up_designationSTANDARD
nondefinitive_spec/std_data134 TYPE AND 00 GRADE
retainer_fabrication_methodPRESSED
NSN3110-00-156-8137
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: 55BA03 · 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
•
BORE SHAPE: STRAIGHT
•
OVERALL OUTSIDE DIAMETER: 120.00 MILLIMETERS NOMINAL MM
•
INTERNAL FIT-UP DESIGNATION: STANDARD
•
STANDARD TOLERANCE DESIGNATION: ABEC NO.1
•
LOAD DIRECTION: ANGULAR
•
NONDEFINITIVE SPEC/STD DATA: 134 TYPE AND 00 GRADE
TECHNICAL CHARACTERISTICS (FLIS)
BORE SHAPESTRAIGHT
OVERALL OUTSIDE DIAMETER120.00 MILLIMETERS NOMINAL MM
INTERNAL FIT-UP DESIGNATIONSTANDARD
STANDARD TOLERANCE DESIGNATIONABEC NO.1
INTERNAL FIT-UP DESIGNATIONSTANDARD
OVERALL WIDTH29.0 MILLIMETERS NOMINAL MM
LOAD DIRECTIONANGULAR
NONDEFINITIVE SPEC/STD DATA134 TYPE AND 00 GRADE
STYLE DESIGNATORCOUNTERBORED OUTER RING, NON-SEPARABLE
MATERIALSTEEL OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 24
297BCInterchangeable
interchangeable cross-reference
interchangeable
21-291Interchangeable
interchangeable cross-reference
interchangeable
52-S-2112Interchangeable
interchangeable cross-reference
interchangeable
1118200Interchangeable
interchangeable cross-reference
interchangeable
584369C1Interchangeable
interchangeable cross-reference
interchangeable
CR77048PC121Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 55BA03?
55BA03 is a BEARING,BALL,ANNULAR.
What parts can replace 55BA03?
There are 24 known substitutes for 55BA03: 297BC, 21-291, 52-S-2112 and 21 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 55BA03?
55BA03 is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-156-8137. 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