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Technical Data Sheet
PartsTable / COMPONENT / 25578-25520
25578-25520 ✓ 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 material: STEEL OVERALL, cup_width: 0.7500 INCHES NOMINAL IN, cone_width: 1.0000 INCHES NOMINAL IN, bore_diameter: 1.6875 INCHES NOMINAL IN, overall_width: 0.9375 INCHES NOMINAL IN, standout_width: 0.1875 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 3110-00-100-5305, 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
25578-25520
NSN: 3110-00-100-5305
FSC: 3110
CAGE: 60038 — THE TIMKEN CORPORATION (USA)
SPECIFICATIONS
materialSTEEL OVERALL
cup_width0.7500 INCHES NOMINAL IN
cone_width1.0000 INCHES NOMINAL IN
bore_diameter1.6875 INCHES NOMINAL IN
overall_width0.9375 INCHES NOMINAL IN
standout_width0.1875 INCHES NOMINAL IN
style_designatorSTRAIGHT BORE, NORMAL ANGLE
cone_corner_radius0.0900 INCHES NOMINAL IN
backface_corner_radius0.0310 INCHES NOMINAL IN
overall_outside_diameter3.2650 INCHES NOMINAL IN
standard_tolerance_designationAFBMA CLASS 2
NSN3110-00-100-5305
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: 25578-25520 · 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
•
STANDOUT WIDTH: 0.1875 INCHES NOMINAL IN
•
MATERIAL: STEEL OVERALL
•
CUP WIDTH: 0.7500 INCHES NOMINAL IN
•
STANDARD TOLERANCE DESIGNATION: AFBMA CLASS 2
•
CONE WIDTH: 1.0000 INCHES NOMINAL IN
•
BORE DIAMETER: 1.6875 INCHES NOMINAL IN
•
OVERALL OUTSIDE DIAMETER: 3.2650 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)
STANDOUT WIDTH0.1875 INCHES NOMINAL IN
MATERIALSTEEL OVERALL
CUP WIDTH0.7500 INCHES NOMINAL IN
STANDARD TOLERANCE DESIGNATIONAFBMA CLASS 2
CONE WIDTH1.0000 INCHES NOMINAL IN
BORE DIAMETER1.6875 INCHES NOMINAL IN
OVERALL OUTSIDE DIAMETER3.2650 INCHES NOMINAL IN
OVERALL WIDTH0.9375 INCHES NOMINAL IN
STYLE DESIGNATORSTRAIGHT BORE, NORMAL ANGLE
CONE CORNER RADIUS0.0900 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
S6763Interchangeable
interchangeable cross-reference
interchangeable
C31-30894A1Interchangeable
interchangeable cross-reference
interchangeable
348642Interchangeable
interchangeable cross-reference
interchangeable
154940Interchangeable
interchangeable cross-reference
interchangeable
25520-25578Interchangeable
Same NIIN cross-reference
interchangeable
12313046Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 25578-25520?
25578-25520 is a BEARING,ROLLER,TAPERED.
What parts can replace 25578-25520?
There are 7 known substitutes for 25578-25520: S6763, C31-30894A1, 348642 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 25578-25520?
25578-25520 is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-100-5305. 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