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Like the TS bearing design, the TSF design 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. TSF bearings have flanged cups to facilitate axial location and accurately align seals in through-bored housings.
Unit of Measure

Specifications

Series

 N/A 28900

Cone Part Number

 N/A 28985

Cup Part Number

 N/A 28921-B

Design Unit

 N/A Inch

Cage Material

 N/A Stamped Steel

Dimensions

d - Bore

 N/A 2 3/8 in60.325 mm

D - Cup Outer Diameter

 N/A 3.937 in100 mm

D1 - Flange Outer Diameter

 N/A 4.0930 in103.962 mm

B - Cone Width

 N/A 1.0000 in25.400 mm

C - Cup Width

 N/A 0.7813 in19.845 mm

C1 - Cup Flange Width

 N/A 0.1563 in3.970 mm

T1 - Bearing Width to Flange

 N/A 0.3750 in9.525 mm

Abutment and Fillet Dimensions

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

da - Cone Frontface Backing Diameter

 N/A 2.64 in67 mm

db - Cone Backface Backing Diameter

 N/A 2.87 in73 mm

Da - Cup Frontface Backing Diameter

 N/A 3.90 in98.04 mm

Ab - Cage-Cone Frontface Clearance

 N/A 0.09 in2.3 mm

Aa - Cage-Cone Backface Clearance

 N/A 0.05 in1.3 mm
a - Effective Center Location3 N/A -0.1 in-2.5 mm

Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)4 N/A 6180 lbf27500 N
C1 - Dynamic Radial Rating (1 million revolutions)5 N/A 23800 lbf106000 N

C0 - Static Radial Rating

 N/A 33500 lbf149000 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)6 N/A 4500 lbf20000 N

Factors

K - Factor7 N/A 1.37
e - ISO Factor8 N/A 0.43
Y - ISO Factor9 N/A 1.41

G1 - Heat Generation Factor (Roller-Raceway)

 N/A 60.1

G2 - Heat Generation Factor (Rib-Roller End)

 N/A 24.5
Cg - Geometry Factor10 N/A 0.103
  • 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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