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.
C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)1
N/A145000 N327000 lbf
C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)2
N/A377000 N84800 lbf
Dimensions
d - Cone Bore
N/A254 mm10 in
B - Cone Width
N/A76 mm2.9921 in
Abutment and Fillet Dimensions
R - Cone Backface "To Clear" Radius3
N/A1.5 mm0.06 in
db - Cone Backface Backing Diameter
N/A270 mm10.63 in
Ab - Cage-Cone Frontface Clearance
N/A6.1 mm0.24 in
Aa - Cage-Cone Backface Clearance
N/A2.3 mm0.09 in
a - Effective Center Location4
N/A6.9 mm-0.27 in
Basic Load Ratings
C90 - Dynamic Radial Rating (90 million revolutions)5
N/A217000 N48700 lbf
Ca90 - Dynamic Thrust Rating (90 million revolutions)6
N/A123000 N27700 lbf
Factors
K - Factor7
N/A1.76
1 Based on 1 x 106 revolutions L10 life, for the ISO life calculation method.
2 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.
3 These maximum fillet radii will be cleared by the bearing corners.
4 Negative value indicates effective center inside cone backface.
5 Based on 90 x 106 revolutions L10 life, for The Timken Company life calculation method. C90 and Ca90 are radial and thrust values.
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.
© 2016 The Timken Company.