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Part Number NA18685 - 18620D, Tapered Roller Bearings - TNA (Tapered Double, non-adjustable) Imperial

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

Specifications

Cone Part Number
NA18685

Cup Part Number
18620D

Design Unit
Inch


Dimensions

d - Bore
1 3/4 in
44.450 mm

D - Cup Outer Diameter
3.1250 in
79.375 mm

T - Bearing Width across Cones
1.6249 in
41.272 mm

C - Double Cup Width
1.3125 in
33.338 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
2.13 in
54 mm

Da - Cup Frontface Backing Diameter
2.94 in
73.91 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.


Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)1
3030 lbf
13500 N

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

Ca90 - Dynamic Thrust Rating (90 million revolutions)3
1940 lbf
8630 N

C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)4
5280 lbf
23500 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
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.


 MORE IMAGES 

·  timken-TNA-cutaway-angle-view

·  timken-TNA-left-angle-view

·  Timken TRB TNA



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