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ST523 ✓ 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 OUTER RING, bore_shape: STRAIGHT, bore_diameter: 25.0 MILLIMETERS NOMINAL MM, load_direction: RADIAL, surface_finish: GROUND, inner_ring_width: 0.9840 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-156-3547, 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
ST523
NSN: 3110-00-156-3547
FSC: 3110
CAGE: 31007 — NAVISTAR INTERNATIONAL CORPORATION DBA NAVISTAR (USA)
SPECIFICATIONS
materialSTEEL OUTER RING
bore_shapeSTRAIGHT
bore_diameter25.0 MILLIMETERS NOMINAL MM
seal_quantity2
load_directionRADIAL
surface_finishGROUND
inner_ring_width0.9840 INCHES NOMINAL IN
outer_ring_width0.6690 INCHES NOMINAL IN
style_designatorNON-LOADING GROOVE, NON-SEPARABLE
bearing_seal_typeCONTACT
lubrication_materialGREASE
overall_outside_diameter62.0 MILLIMETERS NOMINAL MM
NSN3110-00-156-3547
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: ST523 · 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
•
STANDARD TOLERANCE DESIGNATION: ABEC NO.1
•
SEAL QUANTITY: 2
•
LUBRICATION MATERIAL: GREASE
•
INNER RING WIDTH: 0.9840 INCHES NOMINAL IN
•
INTERNAL FIT-UP DESIGNATION: STANDARD
•
BEARING SEAL TYPE: CONTACT
TECHNICAL CHARACTERISTICS (FLIS)
STANDARD TOLERANCE DESIGNATIONABEC NO.1
SEAL QUANTITY2
LUBRICATION MATERIALGREASE
INNER RING WIDTH0.9840 INCHES NOMINAL IN
INTERNAL FIT-UP DESIGNATIONSTANDARD
BEARING SEAL TYPECONTACT
STANDARD TOLERANCE DESIGNATIONABEC NO.1
LUBRICATION MATERIALGREASE
SURFACE FINISHGROUND
OUTER RING WIDTH0.6690 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 19
FF-B-171/36J05D2XInterchangeable
interchangeable cross-reference
interchangeable
700943Interchangeable
interchangeable cross-reference
interchangeable
FF-B-171B SUPP 1Interchangeable
interchangeable cross-reference
interchangeable
FF-B-171/10J14C2XInterchangeable
interchangeable cross-reference
interchangeable
FF-B-171/10Interchangeable
interchangeable cross-reference
interchangeable
43614Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is ST523?
ST523 is a BEARING,BALL,ANNULAR.
What parts can replace ST523?
There are 19 known substitutes for ST523: FF-B-171/36J05D2X, 700943, FF-B-171B SUPP 1 and 16 more. Substitute compatibility should be verified for your specific system.
What is the NSN for ST523?
ST523 is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-156-3547. 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