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/A27000 lbf120000 N
C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)2
N/A7000 lbf31100 N
Dimensions
d - Cone Bore
N/A1.6924 in42.987 mm
B - Cone Width
N/A0.8125 in20.638 mm
Abutment and Fillet Dimensions
R - Cone Backface "To Clear" Radius3
N/A0.06 in1.520 mm
da - Cone Frontface Backing Diameter
N/A1.93 in49 mm
db - Cone Backface Backing Diameter
N/A2.01 in51 mm
Ab - Cage-Cone Frontface Clearance
N/A0.08 in2 mm
Aa - Cage-Cone Backface Clearance
N/A0.02 in0.5 mm
a - Effective Center Location4
N/A-0.15 in-3.8 mm
Basic Load Ratings
C90 - Dynamic Radial Rating (90 million revolutions)5
N/A4020 lbf17900 N
C1 - Dynamic Radial Rating (1 million revolutions)6
N/A15500 lbf68900 N
C0 - Static Radial Rating
N/A18700 lbf83300 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)7
N/A2510 lbf11200 N
Factors
K - Factor8
N/A1.6
G1 - Heat Generation Factor (Roller-Raceway)
N/A28.9
G2 - Heat Generation Factor (Rib-Roller End)
N/A17.9
Cg - Geometry Factor9
N/A0.077
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.