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Tapered Roller Bearings - 2TS-DM (Matched Bearing Assembly, Direct Mount)
Unit of Measure

Specifications

Cone Part Number

 N/A 3979

Cup Part Number

 N/A 3920

Related Assembly Number(s)

 N/A 3979-902A2

Outer Spacer Part Number

 N/A Y4S-3920

Design Unit

 N/A Inch

Dimensions

d - Bore

 N/A 2 1/4 in57.150 mm

D - Cup Outer Diameter

 N/A 4-7/16 in112.713 mm

T - Width

 N/A 2.375 in60.325 mm

B - Width

 N/A 2.366 in60.096 mm

Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1 N/A 0.02 in0.50 mm
r - Cup Backface "To Clear" Radius2 N/A 0.130 in3.30 mm

db - Cone Backface Backing Diameter

 N/A 2.83 in72 mm

Da - Cup Frontface Backing Diameter

 N/A 4.18 in106.17 mm

Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)3 N/A 8090 lbf36000 N
C1 - Dynamic Radial Rating (1 million revolutions)4 N/A 54300 lbf242000 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)5 N/A 5570 lbf24800 N
C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)6 N/A 14100 lbf62700 N

Factors

K - Factor7 N/A 1.45
e - ISO Factor8 N/A 0.4
Y1 - ISO Factor9 N/A 1.68
Y2 - ISO Factor10 N/A 2.5
  • 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 Based on 90 x 106 revolutions L10 life, for The Timken Company life calculation method. C90 and Ca90 are radial and thrust values.
  • 4 Based on 1 x 106 revolutions L10 life, for the ISO life calculation method.
  • 5 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.
  • 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 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
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