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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

 93000

Cone Part Number

 93708

Cup Part Number

 93126

Design Unit

 Inch

Cage Material

 Stamped Steel

Dimensions

d - Bore

 7.0856 in179.974 mm

D - Cup Outer Diameter

 12.5000 in317.500 mm

B - Cone Width

 2.5 in63.5 mm

C - Cup Width

 2.0000 in50.800 mm

T - Bearing Width

 2.6875 in68.263 mm

Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1 0.14 in3.600 mm
r - Cup Backface "To Clear" Radius2 0.130 in3.30 mm

da - Cone Frontface Backing Diameter

 8.03 in204 mm

db - Cone Backface Backing Diameter

 8.23 in209 mm

Da - Cup Frontface Backing Diameter

 11.84 in300.00 mm

Db - Cup Backface Backing Diameter

 11.22 in284.99 mm

Ab - Cage-Cone Frontface Clearance

 0.21 in5.3 mm

Aa - Cage-Cone Backface Clearance

 0.32 in8.1 mm
a - Effective Center Location3 0.31 in7.9 mm

Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)4 42600 lbf190000 N
C1 - Dynamic Radial Rating (1 million revolutions)5 164000 lbf731000 N

C0 - Static Radial Rating

 290000 lbf1290000 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)6 38200 lbf170000 N

Factors

K - Factor7 1.12
e - ISO Factor8 0.52
Y - ISO Factor9 1.15

G1 - Heat Generation Factor (Roller-Raceway)

 912.5

G2 - Heat Generation Factor (Rib-Roller End)

 126.1
Cg - Geometry Factor10 0.146
  • 1 These maximum fillet radii will be cleared by the bearing corners.
  • 2 These maximum fillet radii will be cleared by the bearing corners.
  • 3 Negative value indicates effective center inside cone backface.
  • 4 Based on 90 x 106 revolutions L10 life, for The Timken Company life calculation method. C90 and Ca90 are radial and thrust values.
  • 5 Based on 1 x 106 revolutions L10 life, for the ISO life calculation method.
  • 6 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.
  • 7 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 8 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 9 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 10 Geometry constant for Lubrication Life Adjustment Factor a3l.