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Technical Data Sheet
PartsTable / COMPONENT / D78303
D78303 ✓ 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, end_style: SPRING END,SQUARED AND GROUND BOTH ENDS, cone_width: 1.2205 INCHES NOMINAL IN, bore_diameter: 3.0625 INCHES NOMINAL IN, inside_diameter: 0.925 INCHES NOMINAL IN, style_designator: CYLINDRICAL. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3110-00-143-7537, 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
D78303
NSN: 3110-00-143-7537
FSC: 3110
CAGE: 23926 — KOMATSU AMERICA CORPORATION (USA)
SPECIFICATIONS
materialSTEEL OVERALL
end_styleSPRING END,SQUARED AND GROUND BOTH ENDS
cone_width1.2205 INCHES NOMINAL IN
bore_diameter3.0625 INCHES NOMINAL IN
coil_quantity8
inside_diameter0.925 INCHES NOMINAL IN
style_designatorCYLINDRICAL
cone_corner_radius0.1406 INCHES NOMINAL IN
spring_free_length3.530 INCHES NOMINAL IN
spring_solid_length0.800 INCHES NOMINAL IN
coil_helix_directionRIGHT-HAND OR LEFT-HAND
spring_deflection_rate16.800 POUNDS PER INCH NOMINAL LBS
NSN3110-00-143-7537
COMPONENT DIAGRAM
TAPERED ROLLER BEARING — CUP & CONE ASSEMBLY CAGE CUP BORE CONE OD: — · BORE: — · WIDTH: — Single Row · PN: D78303 · 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: 3.0625 INCHES NOMINAL IN
•
MATERIAL: STEEL OVERALL
•
STANDARD TOLERANCE DESIGNATION: AFBMA CLASS 2
•
STYLE DESIGNATOR: NORMAL ANGLE
•
CONE WIDTH: 1.2205 INCHES NOMINAL IN
•
CONE CORNER RADIUS: 0.1406 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)
BORE DIAMETER3.0625 INCHES NOMINAL IN
MATERIALSTEEL OVERALL
STANDARD TOLERANCE DESIGNATIONAFBMA CLASS 2
STYLE DESIGNATORNORMAL ANGLE
CONE WIDTH1.2205 INCHES NOMINAL IN
CONE CORNER RADIUS0.1406 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 14
44387Interchangeable
interchangeable cross-reference
interchangeable
42690Interchangeable
interchangeable cross-reference
interchangeable
D78303Interchangeable
interchangeable cross-reference
interchangeable
FC89533Interchangeable
interchangeable cross-reference
interchangeable
CA1385-5-LPInterchangeable
interchangeable cross-reference
interchangeable
36885Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is D78303?
D78303 is a CONE AND ROLLERS,TAPERED ROLLER.
What parts can replace D78303?
There are 14 known substitutes for D78303: 44387, 42690, D78303 and 11 more. Substitute compatibility should be verified for your specific system.
Is D78303 still available?
D78303 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026