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Part Number EE720125, Tapered Roller Bearings - Single Cones - Imperial

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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.




Specifications  · Dimensions  · Abutment and Fillet Dimensions  · Basic Load Ratings  · Factors

Specifications

Cone Part Number
EE720125

Design Units
Imperial

Cage Type
Pin-Type

C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)1
1300000 lbf
5760000 N

C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)2
336000 lbf
1490000 N
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.


Dimensions

d - Cone Bore
12.5000 in
317.500 mm

B - Cone Width
5.3750 in
136.525 mm


Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1
0.780 in
19.810 mm

da - Cone Frontface Backing Diameter
13.9 in
353 mm

db - Cone Backface Backing Diameter
15.35 in
390 mm

Ab - Cage-Cone Frontface Clearance
0.38 in
9.7 mm

Aa - Cage-Cone Backface Clearance
0.77 in
19.6 mm

a - Effective Center Location2
-0.66 in
-16.8 mm
1 These maximum fillet radii will be cleared by the bearing corners.
2 Negative value indicates effective center inside cone backface.


Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)1
193000 lbf
858000 N

C1 - Dynamic Radial Rating (1 million revolutions)2
744000 lbf
3310000 N

C0 - Static Radial Rating
1030000 lbf
4600000 N

Ca90 - Dynamic Thrust Rating (90 million revolutions)3
139000 lbf
620000 N
1 Based on 90 x 106 revolutions L10 life, for The Timken Company life calculation method. C90 and Ca90 are radial and thrust values.
2 Based on 1 x 106 revolutions L10 life, for the ISO life calculation method.
3 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.


Factors

K - Factor1
1.38

G1 - Heat Generation Factor (Roller-Raceway)
3160

G2 - Heat Generation Factor (Rib-Roller End)
183

Cg - Geometry Factor2
0.205
1 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
2 Geometry constant for Lubrication Life Adjustment Factor a3l.



 DOWNLOADS 

Tapered Roller Bearing Engineering Information
(PDF, 663KB)

Bearing Life Calculation Tool

Bearing Dimensional Tolerances