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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 990000

Cone Part Number

 N/A EE991201

Cup Part Number

 N/A 992550

Design Unit

 N/A Inch

Cage Material

 N/A Pin-Type

Dimensions

d - Bore

 N/A 12 in304.8 mm

D - Cup Outer Diameter

 N/A 25.5000 in647.700 mm

B - Cone Width

 N/A 4.7500 in120.650 mm

C - Cup Width

 N/A 3.5000 in88.900 mm

T - Bearing Width

 N/A 5.5000 in139.700 mm

Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1 N/A 0.530 in13.460 mm
r - Cup Backface "To Clear" Radius2 N/A 0.530 in13.46 mm

da - Cone Frontface Backing Diameter

 N/A 14.17 in360 mm

db - Cone Backface Backing Diameter

 N/A 15.12 in384 mm

Da - Cup Frontface Backing Diameter

 N/A 23.39 in594.11 mm

Db - Cup Backface Backing Diameter

 N/A 21.50 in546.10 mm

Ab - Cage-Cone Frontface Clearance

 N/A 0.92 in23.4 mm

Aa - Cage-Cone Backface Clearance

 N/A 1.01 in25.7 mm
a - Effective Center Location3 N/A 2.17 in55.1 mm

Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)4 N/A 137000 lbf609000 N
C1 - Dynamic Radial Rating (1 million revolutions)5 N/A 528000 lbf2350000 N

C0 - Static Radial Rating

 N/A 790000 lbf3520000 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)6 N/A 203000 lbf903000 N

Factors

K - Factor7 N/A 0.67
e - ISO Factor8 N/A 0.87
Y - ISO Factor9 N/A 0.69

G1 - Heat Generation Factor (Roller-Raceway)

 N/A 2353.6

G2 - Heat Generation Factor (Rib-Roller End)

 N/A 161.7
Cg - Geometry Factor10 N/A 0.23
  • 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.
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