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Technical Data Sheet
PartsTable / COMPONENT / 15578-15520
15578-15520 ✓ 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,TAPERED is a the manufacturer tape media or drive component used in enterprise backup, archival, and disaster recovery environments. Key specifications include supplementary_features: COGNIZANT SERVICE - UNITED KINGDOM ROYAL AIR FORCE, end_item_identification: UK/FSC/602-PHASE III SERVO INTRODUCTION,RELIANCE ELECTRIC CO. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-100-5281, 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
15578-15520
NSN: 3110-00-100-5281
FSC: 3110
CAGE: 60038 — THE TIMKEN CORPORATION (USA)
SPECIFICATIONS
supplementary_featuresCOGNIZANT SERVICE - UNITED KINGDOM ROYAL AIR FORCE
end_item_identificationUK/FSC/602-PHASE III SERVO INTRODUCTION,RELIANCE ELECTRIC CO
NSN3110-00-100-5281
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: 15578-15520 · 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
•
CUP WIDTH: 0.5313 INCHES NOMINAL IN
•
BORE DIAMETER: 1.0000 INCHES NOMINAL IN
•
STANDARD TOLERANCE DESIGNATION: AFBMA CLASS 2
•
CONE WIDTH: 0.6875 INCHES NOMINAL IN
•
STYLE DESIGNATOR: STRAIGHT BORE, NORMAL ANGLE
•
MATERIAL: STEEL OVERALL
•
CONE CORNER RADIUS: 0.0460 INCHES NOMINAL IN
TYPICAL APPLICATIONS
  • Long-term data archival and compliance retention
  • Offsite backup and disaster recovery
  • Air-gapped ransomware protection
  • Cold storage tier for infrequently accessed data
TECHNICAL CHARACTERISTICS (FLIS)
CUP WIDTH0.5313 INCHES NOMINAL IN
BORE DIAMETER1.0000 INCHES NOMINAL IN
OVERALL WIDTH0.6875 INCHES NOMINAL IN
STANDARD TOLERANCE DESIGNATIONAFBMA CLASS 2
CONE WIDTH0.6875 INCHES NOMINAL IN
STYLE DESIGNATORSTRAIGHT BORE, NORMAL ANGLE
MATERIALSTEEL OVERALL
CONE CORNER RADIUS0.0460 INCHES NOMINAL IN
OVERALL OUTSIDE DIAMETER2.2500 INCHES NOMINAL IN
BACKFACE CORNER RADIUS0.0620 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 16
103710Interchangeable
interchangeable cross-reference
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103665Interchangeable
interchangeable cross-reference
interchangeable
112639Interchangeable
Ef-VG970
interchangeable
232N90-4Interchangeable
interchangeable cross-reference
interchangeable
MS28034-2Interchangeable
interchangeable cross-reference
interchangeable
247728Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 15578-15520?
15578-15520 is a BEARING,ROLLER,TAPERED.
What parts can replace 15578-15520?
There are 16 known substitutes for 15578-15520: 103710, 103665, 112639 and 13 more. Substitute compatibility should be verified for your specific system.
Is 15578-15520 still available?
15578-15520 is currently cancelled.
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PartsTable Design LLC · partstable.com
Last verified: July 2026