PartsTable
Technical Data Sheet
PartsTable / COMPONENT / 3478-3420
3478-3420 ✓ 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: 0.9375 INCHES NOMINAL IN, cone_width: 1.1721 INCHES NOMINAL IN, bore_diameter: 1.3750 INCHES NOMINAL IN, overall_width: 1.1563 INCHES NOMINAL IN, standout_width: 0.2188 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 3110-00-100-5924, 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
3478-3420
NSN: 3110-00-100-5924
FSC: 3110
CAGE: 60038 — THE TIMKEN CORPORATION (USA)
SPECIFICATIONS
materialSTEEL OVERALL
cup_width0.9375 INCHES NOMINAL IN
cone_width1.1721 INCHES NOMINAL IN
bore_diameter1.3750 INCHES NOMINAL IN
overall_width1.1563 INCHES NOMINAL IN
standout_width0.2188 INCHES NOMINAL IN
style_designatorSTRAIGHT BORE, NORMAL ANGLE
cone_corner_radius0.1400 INCHES NOMINAL IN
backface_corner_radius0.1250 INCHES NOMINAL IN
overall_outside_diameter3.1250 INCHES NOMINAL IN
nondefinitive_spec/std_data751 TYPE
standard_tolerance_designationAFBMA CLASS 2
NSN3110-00-100-5924
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: 3478-3420 · 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
•
BACKFACE CORNER RADIUS: 0.1250 INCHES NOMINAL IN
•
CUP WIDTH: 0.9375 INCHES NOMINAL IN
•
CONE CORNER RADIUS: 0.1400 INCHES NOMINAL IN
•
CONE WIDTH: 1.1721 INCHES NOMINAL IN
•
MATERIAL: STEEL OVERALL
•
NONDEFINITIVE SPEC/STD DATA: 751 TYPE
•
STANDARD TOLERANCE DESIGNATION: AFBMA CLASS 2
•
STYLE DESIGNATOR: STRAIGHT BORE, NORMAL ANGLE
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)
BACKFACE CORNER RADIUS0.1250 INCHES NOMINAL IN
CUP WIDTH0.9375 INCHES NOMINAL IN
CONE CORNER RADIUS0.1400 INCHES NOMINAL IN
CONE WIDTH1.1721 INCHES NOMINAL IN
MATERIALSTEEL OVERALL
NONDEFINITIVE SPEC/STD DATA751 TYPE
STANDARD TOLERANCE DESIGNATIONAFBMA CLASS 2
STYLE DESIGNATORSTRAIGHT BORE, NORMAL ANGLE
OVERALL WIDTH1.1563 INCHES NOMINAL IN
BORE DIAMETER1.3750 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
7191Interchangeable
interchangeable cross-reference
interchangeable
21-0167Interchangeable
interchangeable cross-reference
interchangeable
K3434Interchangeable
Same NIIN cross-reference
interchangeable
0210167-00Interchangeable
Same NIIN cross-reference
interchangeable
FFB187Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 3478-3420?
3478-3420 is a BEARING,ROLLER,TAPERED.
What parts can replace 3478-3420?
There are 5 known substitutes for 3478-3420: 7191, 21-0167, K3434 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 3478-3420?
3478-3420 is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-100-5924. 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