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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

 33800

Cone Part Number

 33895

Cup Part Number

 33821

Design Unit

 Inch

Cage Material

 Stamped Steel

Dimensions

d - Bore

 2.1250 in53.975 mm

D - Cup Outer Diameter

 3.7500 in95.250 mm

B - Cone Width

 1.1250 in28.575 mm

C - Cup Width

 0.8750 in22.225 mm

T - Bearing Width

 1.0938 in27.783 mm

Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1 0.06 in1.5 mm
r - Cup Backface "To Clear" Radius2 0.090 in2.29 mm

da - Cone Frontface Backing Diameter

 2.36 in60 mm

db - Cone Backface Backing Diameter

 2.48 in63 mm

Da - Cup Frontface Backing Diameter

 3.56 in90.42 mm

Db - Cup Backface Backing Diameter

 3.35 in85.09 mm

Ab - Cage-Cone Frontface Clearance

 0.11 in2.8 mm

Aa - Cage-Cone Backface Clearance

 0.04 in1 mm
a - Effective Center Location3 -0.3 in-7.6 mm

Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)4 7560 lbf33600 N
C1 - Dynamic Radial Rating (1 million revolutions)5 29200 lbf130000 N

C0 - Static Radial Rating

 36200 lbf161000 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)6 4270 lbf19000 N

Factors

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

G1 - Heat Generation Factor (Roller-Raceway)

 52.5

G2 - Heat Generation Factor (Rib-Roller End)

 18.5
Cg - Geometry Factor10 0.091
  • 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.