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This is the most basic and most widely used type of tapered roller bearing. It consists of two main separable parts: the cone (inner ring) assembly and the cup (outer ring). It is typically mounted in opposing pairs on a shaft.
Unit of Measure

Specifications

Series

 N/A 56000

Cone Part Number

 N/A NA56425SW

Design Units

 N/A Imperial

Cage Type

 N/A Stamped Steel

Dimensions

d - Cone Bore

 N/A 4.25 in107.95 mm

B - Cone Width

 N/A 1.75 in44.45 mm

Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1 N/A 0.14 in3.556 mm

da - Cone Frontface Backing Diameter

 N/A 0 in0 mm

db - Cone Backface Backing Diameter

 N/A 4.84 in123 mm

Ab - Cage-Cone Frontface Clearance

 N/A -0.1 in-0.25 mm

Aa - Cage-Cone Backface Clearance

 N/A 0.27 in6.9 mm
a - Effective Center Location2 N/A -0.05 in-1.3 mm

Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)3 N/A 13200 lbf58700 N
C1 - Dynamic Radial Rating (1 million revolutions)4 N/A 50900 lbf226000 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)5 N/A 11200 lbf50000 N

Factors

K - Factor6 N/A 1.18

G1 - Heat Generation Factor (Roller-Raceway)

 N/A 190.9

G2 - Heat Generation Factor (Rib-Roller End)

 N/A 47.7
  • 1 These maximum fillet radii will be cleared by the bearing corners.
  • 2 Negative value indicates effective center inside cone backface.
  • 3 Based on 90 x 106 revolutions L10 life, for The Timken Company life calculation method. C90 and Ca90 are radial and thrust values.
  • 4 Based on 1 x 106 revolutions L10 life, for the ISO life calculation method.
  • 5 Based on 90 x 106 revolutions L10 life, for The Timken Company life calculation method. C90 and Ca90 are radial and thrust values for a single-row, C90(2) is the two-row radial value.
  • 6 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
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