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/A359000 lbf1600000 N
C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)2
N/A93000 lbf414000 N
Dimensions
d - Cone Bore
N/A7.875 in200.025 mm
B - Cone Width
N/A2.7500 in69.850 mm
Abutment and Fillet Dimensions
R - Cone Backface "To Clear" Radius3
N/A0.25 in6.4 mm
da - Cone Frontface Backing Diameter
N/A8.7 in221 mm
db - Cone Backface Backing Diameter
N/A9.09 in231 mm
Ab - Cage-Cone Frontface Clearance
N/A0.2 in5.1 mm
Aa - Cage-Cone Backface Clearance
N/A0.18 in4.6 mm
a - Effective Center Location4
N/A0.03 in0.8 mm
Basic Load Ratings
C90 - Dynamic Radial Rating (90 million revolutions)5
N/A53400 lbf238000 N
C1 - Dynamic Radial Rating (1 million revolutions)6
N/A206000 lbf917000 N
C0 - Static Radial Rating
N/A353000 lbf1570000 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)7
N/A40200 lbf179000 N
Factors
K - Factor8
N/A1.33
G1 - Heat Generation Factor (Roller-Raceway)
N/A1017.2
G2 - Heat Generation Factor (Rib-Roller End)
N/A140.1
Cg - Geometry Factor9
N/A0.143
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 1 x 106 revolutions L10 life, for the ISO life calculation method.
7 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.
8 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
9 Geometry constant for Lubrication Life Adjustment Factor a3l.