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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 680000

Cone Part Number

 N/A 680235

Cup Part Number

 N/A 680270-B

Design Unit

 N/A Inch

Cage Material

 N/A Stamped Steel

Dimensions

d - Bore

 N/A 23.5000 in596.900 mm

D - Cup Outer Diameter

 N/A 27.0000 in685.800 mm

D1 - Flange Outer Diameter

 N/A 27.2772 in692.841 mm

B - Cone Width

 N/A 1.2500 in31.750 mm

C - Cup Width

 N/A 1.0000 in25.400 mm

C1 - Cup Flange Width

 N/A 0.2812 in7.142 mm

T1 - Bearing Width to Flange

 N/A 0.5312 in13.492 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 24.21 in615 mm

db - Cone Backface Backing Diameter

 N/A 24.21 in615 mm

Da - Cup Frontface Backing Diameter

 N/A 26.46 in669.04 mm

Ab - Cage-Cone Frontface Clearance

 N/A 0.05 in1.3 mm

Aa - Cage-Cone Backface Clearance

 N/A 0.01 in0.3 mm
a - Effective Center Location3 N/A 3.78 in96 mm

Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)4 N/A 20000 lbf89200 N
C1 - Dynamic Radial Rating (1 million revolutions)5 N/A 77300 lbf344000 N

C0 - Static Radial Rating

 N/A 217000 lbf963000 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)6 N/A 18100 lbf80400 N

Factors

K - Factor7 N/A 1.11
e - ISO Factor8 N/A 0.53
Y - ISO Factor9 N/A 1.14

G1 - Heat Generation Factor (Roller-Raceway)

 N/A 3740

G2 - Heat Generation Factor (Rib-Roller End)

 N/A 1810
Cg - Geometry Factor10 N/A 0.223
  • 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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