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This is the most basic and most widely used type of tapered roller bearing. It 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.

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Unit of Measure

Specifications

Series

N/A 1700

Cone Part Number

N/A 1780

Cup Part Number

N/A 1729X

Design Units

N/A Imperial

Bearing Weight

N/A 0.20 Kg0.5 lb

Cage Type

N/A Stamped Steel

Dimensions

d - Bore

N/A 25.400 mm1.0000 in

D - Cup Outer Diameter

N/A 56.896 mm2.2400 in

B - Cone Width

N/A 19.837 mm0.7810 in

C - Cup Width

N/A 15.875 mm0.6250 in

T - Bearing Width

N/A 19.368 mm0.7625 in

Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1 N/A 0.760 mm0.03 in
r - Cup Backface "To Clear" Radius2 N/A 1.52 mm0.06 in

da - Cone Frontface Backing Diameter

N/A 29.97 mm1.18 in

db - Cone Backface Backing Diameter

N/A 30.48 mm1.2 in

Da - Cup Frontface Backing Diameter

N/A 51.10 mm2.05 in

Db - Cup Backface Backing Diameter

N/A 49.02 mm1.93 in

Ab - Cage-Cone Frontface Clearance

N/A 2 mm0.08 in

Aa - Cage-Cone Backface Clearance

N/A 0.3 mm0.01 in
a - Effective Center Location3 N/A -6.9 mm-0.27 in

Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)4 N/A 2650 lbf11800 N
C1 - Dynamic Radial Rating (1 million revolutions)5 N/A 10200 lbf45400 N

C0 - Static Radial Rating

N/A 10200 lbf45300 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)6 N/A 1390 lbf6200 N

Factors

K - Factor7 N/A 1.9
e - ISO Factor8 N/A 0.31
Y - ISO Factor9 N/A 1.95

G1 - Heat Generation Factor (Roller-Raceway)

N/A 10.6

G2 - Heat Generation Factor (Rib-Roller End)

N/A 5.4
Cg - Geometry Factor10 N/A 0.0521
  • 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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