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PartsTable / COMPONENT / SY258
SY258 ✓ 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 INNER RING, bore_shape: STRAIGHT, bore_diameter: 4.3747 INCHES MINIMUM AND 4.3750 INCHES MAXIMUM IN, contact_angle: 25.0 DEGREES MAXIMUM, overall_width: 0.6870 INCHES MINIMUM AND 0.6875 INCHES MAXIMUM IN, 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 3110-00-198-1704, 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
SY258
NSN: 3110-00-198-1704
FSC: 3110
CAGE: 53035 — NSK CORP BEARING DIV (USA)
SPECIFICATIONS
materialSTEEL INNER RING
bore_shapeSTRAIGHT
bore_diameter4.3747 INCHES MINIMUM AND 4.3750 INCHES MAXIMUM IN
contact_angle25.0 DEGREES MAXIMUM
overall_width0.6870 INCHES MINIMUM AND 0.6875 INCHES MAXIMUM IN
load_directionANGULAR
surface_finishGROUND
special_featuresBLACK OXIDE FINISH ON ALL EXPOSED SURFACES
style_designatorCOUNTERBORED OUTER RING, NON-SEPARABLE
overall_outside_diameter5.7496 INCHES MINIMUM AND 5.7500 INCHES MAXIMUM IN
retainer_fabrication_methodMACHINED
NSN3110-00-198-1704
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: SY258 · 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
•
CONTACT ANGLE: 25.0 DEGREES MAXIMUM
•
MATERIAL: STEEL INNER RING
•
STYLE DESIGNATOR: COUNTERBORED OUTER RING, NON-SEPARABLE
TECHNICAL CHARACTERISTICS (FLIS)
SURFACE FINISHGROUND
CONTACT ANGLE25.0 DEGREES MAXIMUM
MATERIALSTEEL INNER RING
MATERIALPLASTIC PHENOLIC RETAINER
MATERIALSTEEL INNER RING
MATERIALSTEEL BALL
STYLE DESIGNATORCOUNTERBORED OUTER RING, NON-SEPARABLE
SPECIAL FEATURESBLACK OXIDE FINISH ON ALL EXPOSED SURFACES
STYLE DESIGNATORCOUNTERBORED OUTER RING, NON-SEPARABLE
OVERALL WIDTH0.6870 INCHES MINIMUM AND 0.6875 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
5133-15HInterchangeable
interchangeable cross-reference
interchangeable
74-45308-1007Interchangeable
interchangeable cross-reference
interchangeable
910510-06Interchangeable
interchangeable cross-reference
interchangeable
Z38Interchangeable
interchangeable cross-reference
interchangeable
7413Interchangeable
interchangeable cross-reference
interchangeable
61A53C30Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is SY258?
SY258 is a BEARING,BALL,ANNULAR.
What parts can replace SY258?
There are 6 known substitutes for SY258: 5133-15H, 74-45308-1007, 910510-06 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for SY258?
SY258 is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-198-1704. 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