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Part Number NA08125 - 08231D, 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
NA08125

Cup Part Number
08231D

Design Unit
Inch


Dimensions

d - Bore
1 1/4 in
31.750 mm

D - Cup Outer Diameter
2.3125 in
58.738 mm

T - Bearing Width across Cones
1.2812 in
32.542 mm

C - Double Cup Width
0.9688 in
24.608 mm


Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1
0.06 in
1.5 mm

r - Cup Backface "To Clear" Radius2
0.020 in
0.40 mm

db - Cone Backface Backing Diameter
1.52 in
38.5 mm

Da - Cup Frontface Backing Diameter
2.20 in
55.12 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
1850 lbf
8220 N

C1 - Dynamic Radial Rating (1 million revolutions)2
12400 lbf
55200 N

Ca90 - Dynamic Thrust Rating (90 million revolutions)3
1500 lbf
6670 N

C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)4
3220 lbf
14300 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
1.23

e - ISO Factor2
0.47

Y1 - ISO Factor3
1.42

Y2 - ISO Factor4
2.12
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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