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Unit of Measure

Specifications

Cone Part Number

 N/A NA3780

Cup Part Number

 N/A 3729D

Related Assembly Number(s)

 N/A NA3780-90071

Design Unit

 N/A Inch

Dimensions

d - Bore

 N/A 2 in50.8 mm

D - Cup Outer Diameter

 N/A 3.6718 in93.264 mm

T - Bearing Width across Cones

 N/A 2.5625 in65.088 mm

C - Double Cup Width

 N/A 2.0625 in52.388 mm

Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1 N/A 0.14 in3.5 mm
r - Cup Backface "To Clear" Radius2 N/A 0.030 in0.8 mm

db - Cone Backface Backing Diameter

 N/A 2.52 in64 mm

Da - Cup Frontface Backing Diameter

 N/A 3.50 in88.90 mm

Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)3 N/A 7120 lbf31700 N
C1 - Dynamic Radial Rating (1 million revolutions)4 N/A 47800 lbf213000 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)5 N/A 4120 lbf18300 N
C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)6 N/A 12400 lbf55100 N

Factors

K - Factor7 N/A 1.73
e - ISO Factor8 N/A 0.34
Y1 - ISO Factor9 N/A 1.99
Y2 - ISO Factor10 N/A 2.97
  • 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.