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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 680235 - 680270  
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Part Number 680235 - 680270, 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
680000

Cone Part Number
680235

Cup Part Number
680270

Design Unit
Inch

Cage Material
Stamped Steel

Related Assembly Number(s)
680235-90015
680235-90022


Dimensions

d - Bore
23.5000 in
596.900 mm

D - Cup Outer Diameter
27.0000 in
685.800 mm

B - Cone Width
1.2500 in
31.750 mm

C - Cup Width
1.0000 in
25.400 mm

T - Bearing Width
1.2500 in
31.750 mm


Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1
0.14 in
3.600 mm

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

da - Cone Frontface Backing Diameter
24.21 in
615 mm

db - Cone Backface Backing Diameter
24.21 in
615 mm

Da - Cup Frontface Backing Diameter
26.46 in
672.08 mm

Db - Cup Backface Backing Diameter
26.10 in
662.94 mm

Ab - Cage-Cone Frontface Clearance
0.05 in
1.3 mm

Aa - Cage-Cone Backface Clearance
0.01 in
0.3 mm

a - Effective Center Location3
3.78 in
96 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
20000 lbf
89200 N

C1 - Dynamic Radial Rating (1 million revolutions)2
77300 lbf
344000 N

C0 - Static Radial Rating
217000 lbf
963000 N

Ca90 - Dynamic Thrust Rating (90 million revolutions)3
18100 lbf
80400 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
1.11

e - ISO Factor2
0.53

Y - ISO Factor3
1.14

G1 - Heat Generation Factor (Roller-Raceway)
3740

G2 - Heat Generation Factor (Rib-Roller End)
1810

Cg - Geometry Factor4
0.223
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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