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All Product Types > ENGINEERED BEARINGS > Tapered Roller Bearings > Tapered Roller Bearings - TNA (Tapered Double, non-adjustable) Imperial > Part Number NA397 - 394D  
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Part Number NA397 - 394D, Tapered Roller Bearings - TNA (Tapered Double, non-adjustable) Imperial






Unit of Measure: Imperial Metric Both

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

Specifications

Cone Part Number
NA397

Cup Part Number
394D

Related Assembly Number(s)
NA397-90089

Design Unit
Inch


Dimensions

d - Bore
2.3622 in
60 mm

D - Cup Outer Diameter
4.3307 in
110 mm

T - Bearing Width across Cones
2.0625 in
52.388 mm

C - Double Cup Width
1.8125 in
46.038 mm


Abutment and Fillet Dimensions

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

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

db - Cone Backface Backing Diameter
2.91 in
74 mm

Da - Cup Frontface Backing Diameter
4.12 in
104.65 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
5760 lbf
25600 N

C1 - Dynamic Radial Rating (1 million revolutions)2
38700 lbf
172000 N

Ca90 - Dynamic Thrust Rating (90 million revolutions)3
3970 lbf
17600 N

C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)4
10000 lbf
44600 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
1.45

e - ISO Factor2
0.4

Y1 - ISO Factor3
1.68

Y2 - ISO Factor4
2.5
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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Bearing Life Calculation Tool

Bearing Dimensional Tolerances

Tools and Guides for Engineers


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