PartsTable
Technical Data Sheet
521578 ✓ 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,ROLLER,NEEDLE is a the manufacturer industrial component. Key specifications include material: STEEL COMP 302 OR STEEL COMP 304 OVERALL, thickness: 0.040 INCHES NOMINAL IN, hole_diameter: 0.197 INCHES MINIMUM AND 0.200 INCHES MAXIMUM IN, overall_diameter: 0.323 INCHES MINIMUM AND 0.326 INCHES MAXIMUM IN, peripheral_shape_style: ROUND, center_hole_shape_style: ROUND. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-277-0532, 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
521578
NSN: 3110-00-277-0532
FSC: 3110
CAGE: 02978 — RENK AMERICA LLC DIV RENK AMERICA (USA)
SPECIFICATIONS
materialSTEEL COMP 302 OR STEEL COMP 304 OVERALL
thickness0.040 INCHES NOMINAL IN
hole_diameter0.197 INCHES MINIMUM AND 0.200 INCHES MAXIMUM IN
overall_diameter0.323 INCHES MINIMUM AND 0.326 INCHES MAXIMUM IN
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
NSN3110-00-277-0532
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: 521578 · 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 DIAMETER: 0.5620 INCHES NOMINAL IN
STANDARD TOLERANCE DESIGNATION: AFBMA STD TOLERANCE FOR INDUSTRIAL NEEDLE BEARINGS
OVERALL OUTSIDE DIAMETER: 0.7500 INCHES NOMINAL IN
SURFACE TREATMENT: OXIDE OUTER RACE
ALIGNMENT TYPE: RIGID
TECHNICAL CHARACTERISTICS (FLIS)
BORE DIAMETER0.5620 INCHES NOMINAL IN
STANDARD TOLERANCE DESIGNATIONAFBMA STD TOLERANCE FOR INDUSTRIAL NEEDLE BEARINGS
SPECIAL FEATURESSTAINLESS STEEL NEEDLES
OVERALL OUTSIDE DIAMETER0.7500 INCHES NOMINAL IN
SURFACE TREATMENTOXIDE OUTER RACE
ALIGNMENT TYPERIGID
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
286414Interchangeable
interchangeable cross-reference
interchangeable
11-764368C92R851Interchangeable
interchangeable cross-reference
interchangeable
30730Interchangeable
interchangeable cross-reference
interchangeable
521578Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 521578?
521578 is a BEARING,ROLLER,NEEDLE.
What parts can replace 521578?
There are 4 known substitutes for 521578: 286414, 11-764368C92R851, 30730 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 521578?
521578 is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-277-0532. This indicates validated use in U.S. government and defense supply chains.
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