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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

Cup Part Number

 N/A 28921-B

Design Units

 N/A Imperial

Dimensions

D - Cup Outer Diameter

 N/A 3.937 in

D1 - Flange Outer Diameter

 N/A 4.0930 in

C - Cup Width

 N/A 0.7813 in

C1 - Cup Flange Width

 N/A 0.1563 in

Abutment and Fillet Dimensions

r - Cup Backface "To Clear" Radius1 N/A 0.130 in

Da - Cup Frontface Backing Diameter

 N/A 3.90 in

Factors

K - Factor2 N/A 1.37
e - ISO Factor3 N/A 0.43
Y - ISO Factor4 N/A 1.41
Cg - Geometry Factor5 N/A 0.103
  • 1 These maximum fillet radii will be cleared by the bearing corners.
  • 2 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 3 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 4 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 5 Geometry constant for Lubrication Life Adjustment Factor a3l.