All Product Types > ENGINEERED BEARINGS > Tapered Roller Bearings > Tapered Roller Bearings - Single Cones > Tapered Roller Bearings - Single Cones - Imperial > Part Number NA438  

Part Number NA438, Tapered Roller Bearings - Single Cones - Imperial

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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.




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

Specifications

Design Units
Imperial

C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)1
49700 lbf
221000 N

C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)2
12900 lbf
57300 N
1 Based on 1 x 106 revolutions L10 life, for the ISO life calculation method.
2 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.


Dimensions

d - Cone Bore
1 3/4 in
44.450 mm

B - Cone Width
1.2188 in
30.9575 mm


Abutment and Fillet Dimensions

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

db - Cone Backface Backing Diameter
2.24 in
57 mm

Ab - Cage-Cone Frontface Clearance
-0.06094 in
-1.547875 mm

Aa - Cage-Cone Backface Clearance
0.12188 in
3.09575 mm

a - Effective Center Location2
-0.36 in
-9.1 mm
1 These maximum fillet radii will be cleared by the bearing corners.
2 Negative value indicates effective center inside cone backface.


Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)1
7400 lbf
32900 N

Ca90 - Dynamic Thrust Rating (90 million revolutions)2
3600 lbf
16000 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 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
2.05
1 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.



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Tapered Roller Bearing Engineering Information
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Bearing Life Calculation Tool

Bearing Dimensional Tolerances