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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 80780 - 80720  
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Part Number 80780 - 80720, 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
80700

Cone Part Number
80780

Cup Part Number
80720

Design Unit
Inch

Cage Material
Stamped Steel

Related Assembly Number(s)
80780-90010
80780-90014


Dimensions

d - Bore
25.0000 in
635.000 mm

D - Cup Outer Diameter
29.0000 in
736.600 mm

B - Cone Width
2.125 in
53.975 mm

C - Cup Width
1.6250 in
41.275 mm

T - Bearing Width
2.2500 in
57.150 mm


Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1
0.13 in
3.300 mm

r - Cup Backface "To Clear" Radius2
0.130 in
3.30 mm

da - Cone Frontface Backing Diameter
25.63 in
651 mm

db - Cone Backface Backing Diameter
25.75 in
654 mm

Da - Cup Frontface Backing Diameter
28.32 in
719.30 mm

Db - Cup Backface Backing Diameter
28.11 in
713.99 mm

Ab - Cage-Cone Frontface Clearance
0.09 in
2.3 mm

Aa - Cage-Cone Backface Clearance
0.29 in
7.4 mm

a - Effective Center Location3
2.73 in
69.3 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
38100 lbf
169000 N

C1 - Dynamic Radial Rating (1 million revolutions)2
147000 lbf
654000 N

C0 - Static Radial Rating
412000 lbf
1830000 N

Ca90 - Dynamic Thrust Rating (90 million revolutions)3
28600 lbf
127000 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
1.33

e - ISO Factor2
0.44

Y - ISO Factor3
1.37

G1 - Heat Generation Factor (Roller-Raceway)
5880

G2 - Heat Generation Factor (Rib-Roller End)
1625

Cg - Geometry Factor4
0.246
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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