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All Product Types > ENGINEERED BEARINGS > Tapered Roller Bearings > Tapered Roller Bearings - TDO (Tapered Double Outer) > Tapered Roller Bearings - TDO (Tapered Double Outer) Imperial > Part Number 18685 - 18620D  
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Part Number 18685 - 18620D, Tapered Roller Bearings - TDO (Tapered Double Outer) Imperial


The configuration of the TDO provides a wide effective bearing spread, making it ideal for applications in which overturning moments are a significant load component. TDO bearings can be used in fixed positions or allowed to float in the housing bore.



Unit of Measure: Imperial Metric Both

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

Specifications

Series
18600

Cone Part Number
18685

Cup Part Number
18620D

Design Unit
Inch

Cage Material
Stamped Steel

Related Assembly Number(s)
18685-90014
18685-90029
18685-90033
18685-90035
18685-90037
18685-90043
18685-90069
18685-902A2
18685-903A1


Dimensions

d - Bore
1 3/4 in
44.450 mm

D - Cup Outer Diameter
3.1250 in
79.375 mm

B - Cone Width
0.6875 in
17.463 mm

C - Double Cup Width
1.3125 in
33.338 mm

T - Bearing Width across Cones
1.6248 in
41.270 mm


Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1
0.11 in
2.8 mm

r - Cup Backface "To Clear" Radius2
0.030 in
0.8 mm

db - Cone Backface Backing Diameter
2.17 in
55 mm

Da - Cup Frontface Backing Diameter
2.94 in
73.91 mm

Aa - Cage-Cone Backface Clearance
0.01 in
0.3 mm

a - Effective Center Location3
-0.08 in
-2 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 (One-Row, 90 million revolutions)1
3030 lbf
13500 N

C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)2
20400 lbf
90600 N

C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)3
5280 lbf
23500 N

Ca90 - Dynamic Thrust Rating (90 million revolutions)4
1940 lbf
8630 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.
4 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
1.56

e - ISO Factor2
0.37

Y1 - ISO Factor3
1.8

Y2 - ISO Factor4
2.69

Cg - Geometry Factor5
0.0725
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 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
5 Geometry constant for Lubrication Life Adjustment Factor a3l.


 MORE IMAGES 

·  Timken_TRB_2ROWASSY_TDO_438-90092-A

·  Timken_TRB_2ROWASSY_TDO_438-90092-A3

·  Timken_TRB_2ROWASSY_TDO_438-90092-T2



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