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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

 1900

Cone Part Number

 1985

Cup Part Number

 1932

Design Unit

 Inch

Cage Material

 Stamped Steel

Related Assembly Number(s)

 1985-90016

Dimensions

d - Bore

 1 1/8 in28.575 mm

D - Cup Outer Diameter

 2.3125 in58.738 mm

B - Cone Width

 0.7620 in19.355 mm

C - Cup Width

 0.5937 in15.080 mm

T - Bearing Width

 0.75 in19.05 mm

Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1 0.03 in0.800 mm
r - Cup Backface "To Clear" Radius2 0.050 in1.27 mm

da - Cone Frontface Backing Diameter

 1.32 in33.5 mm

db - Cone Backface Backing Diameter

 1.34 in34 mm

Da - Cup Frontface Backing Diameter

 2.17 in55.10 mm

Db - Cup Backface Backing Diameter

 2.05 in52.07 mm

Ab - Cage-Cone Frontface Clearance

 0.08 in2 mm

Aa - Cage-Cone Backface Clearance

 0 in0 mm
a - Effective Center Location3 -0.23 in-5.8 mm

Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)4 2820 lbf12500 N
C1 - Dynamic Radial Rating (1 million revolutions)5 10900 lbf48400 N

C0 - Static Radial Rating

 11300 lbf50200 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)6 1590 lbf7080 N

Factors

K - Factor7 1.77
e - ISO Factor8 0.33
Y - ISO Factor9 1.82

G1 - Heat Generation Factor (Roller-Raceway)

 12.5

G2 - Heat Generation Factor (Rib-Roller End)

 6.33
Cg - Geometry Factor10 0.0565
  • 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.