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All Product Types > ENGINEERED BEARINGS > Tapered Roller Bearings > Tapered Roller Bearings - TS (Tapered Single) > Tapered Roller Bearings - TS (Tapered Single) Imperial > Part Number EE780655 - 781400  
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Part Number EE780655 - 781400, Tapered Roller Bearings - TS (Tapered Single) Imperial


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.



Unit of Measure: Imperial Metric Both

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

Specifications

Series
780000

Cone Part Number
EE780655

Cup Part Number
781400

Design Unit
Inch

Cage Material
Pin-Type


Dimensions

d - Bore
6.5 in
165.1 mm

D - Cup Outer Diameter
14 in
355.6 mm

B - Cone Width
2.375 in
60.325 mm

C - Cup Width
1.6250 in
41.275 mm

T - Bearing Width
2.4375 in
61.913 mm


Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1
0.190 in
4.800 mm

r - Cup Backface "To Clear" Radius2
0.190 in
4.83 mm

da - Cone Frontface Backing Diameter
7.83 in
199 mm

db - Cone Backface Backing Diameter
7.8 in
198.1 mm

Da - Cup Frontface Backing Diameter
12.68 in
322.07 mm

Db - Cup Backface Backing Diameter
12.60 in
320.04 mm

Ab - Cage-Cone Frontface Clearance
0.26 in
6.6 mm

Aa - Cage-Cone Backface Clearance
0.27 in
6.9 mm

a - Effective Center Location3
-0.01 in
-0.3 mm
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.


Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)1
51100 lbf
227000 N

C1 - Dynamic Radial Rating (1 million revolutions)2
197000 lbf
876000 N

C0 - Static Radial Rating
243000 lbf
1080000 N

Ca90 - Dynamic Thrust Rating (90 million revolutions)3
34900 lbf
155000 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
1.46

e - ISO Factor2
0.4

Y - ISO Factor3
1.5

G1 - Heat Generation Factor (Roller-Raceway)
646.5

G2 - Heat Generation Factor (Rib-Roller End)
79.5

Cg - Geometry Factor4
0.118
1 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
2 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
3 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
4 Geometry constant for Lubrication Life Adjustment Factor a3l.



 DOWNLOADS 

Tapered Roller Bearing Engineering Information
(PDF, 663KB)

Bearing Life Calculation Tool

Bearing Dimensional Tolerances



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