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All Product Types > ENGINEERED BEARINGS > Tapered Roller Bearings > Tapered Roller Bearings - Single Cones > Tapered Roller Bearings - Single Cones - Imperial > Part Number NA28138  
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Part Number NA28138, Tapered Roller Bearings - Single Cones - Imperial


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.



Unit of Measure: Imperial Metric Both

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

Specifications

Design Units
Imperial

C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)1
24800 lbf
111000 N

C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)2
7640 lbf
34000 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
1.3770 in
34.976 mm

B - Cone Width
0.9063 in
23.02 mm


Abutment and Fillet Dimensions

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

db - Cone Backface Backing Diameter
1.71 in
43.5 mm

Ab - Cage-Cone Frontface Clearance
-0.045315 in
-1.151 mm

Aa - Cage-Cone Backface Clearance
0.09063 in
2.302 mm

a - Effective Center Location2
-0.19 in
-4.8 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
4390 lbf
19500 N

Ca90 - Dynamic Thrust Rating (90 million revolutions)2
3020 lbf
13400 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
1.45
1 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.



 DOWNLOADS 

Tapered Roller Bearing Engineering Information
(PDF, 663KB)

Bearing Life Calculation Tool

Bearing Dimensional Tolerances


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