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Technical Data Sheet
PartsTable / COMPONENT / 103S21
103S21 ✓ 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

CONE AND ROLLERS,TAPERED ROLLER. Key specifications include material: STEEL OVERALL, cone_width: 0.8661 INCHES NOMINAL IN, bore_diameter: 2.5000 INCHES NOMINAL IN, style_designator: NORMAL ANGLE, cone_corner_radius: 0.0800 INCHES NOMINAL IN, standard_tolerance_designation: AFBMA CLASS 2. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-903-0913, 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
103S21
NSN: 3110-00-903-0913
FSC: 3110
CAGE: 06848 — HONEYWELL INTERNATIONAL INC DIV AEROSPACE-SOUTH BEND (BENDIX DR) (USA)
SPECIFICATIONS
materialSTEEL OVERALL
cone_width0.8661 INCHES NOMINAL IN
bore_diameter2.5000 INCHES NOMINAL IN
style_designatorNORMAL ANGLE
cone_corner_radius0.0800 INCHES NOMINAL IN
standard_tolerance_designationAFBMA CLASS 2
NSN3110-00-903-0913
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: 103S21 · 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
•
MATERIAL: STEEL OVERALL
•
STYLE DESIGNATOR: NORMAL ANGLE
•
CONE WIDTH: 0.8661 INCHES NOMINAL IN
•
CONE CORNER RADIUS: 0.0800 INCHES NOMINAL IN
•
BORE DIAMETER: 2.5000 INCHES NOMINAL IN
•
STANDARD TOLERANCE DESIGNATION: AFBMA CLASS 2
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)
MATERIALSTEEL OVERALL
STYLE DESIGNATORNORMAL ANGLE
CONE WIDTH0.8661 INCHES NOMINAL IN
CONE CORNER RADIUS0.0800 INCHES NOMINAL IN
BORE DIAMETER2.5000 INCHES NOMINAL IN
STANDARD TOLERANCE DESIGNATIONAFBMA CLASS 2
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
39250Interchangeable
interchangeable cross-reference
interchangeable
FFB187/01-454Interchangeable
interchangeable cross-reference
interchangeable
UG100AUInterchangeable
interchangeable cross-reference
interchangeable
3925-0-2Interchangeable
interchangeable cross-reference
interchangeable
91389023Interchangeable
interchangeable cross-reference
interchangeable
8285-1Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 103S21?
103S21 is a CONE AND ROLLERS,TAPERED ROLLER.
What parts can replace 103S21?
There are 8 known substitutes for 103S21: 39250, FFB187/01-454, UG100AU and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 103S21?
103S21 is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-903-0913. 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