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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 NA66212  
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Part Number NA66212, 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
58300 lbf
259000 N

C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)2
15100 lbf
67200 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
2.1250 in
53.975 mm

B - Cone Width
1.4375 in
36.5125 mm


Abutment and Fillet Dimensions

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

db - Cone Backface Backing Diameter
2.87 in
73 mm

Ab - Cage-Cone Frontface Clearance
-0.071875 in
-1.825625 mm

Aa - Cage-Cone Backface Clearance
0.14375 in
3.65125 mm

a - Effective Center Location2
-0.01 in
-0.3 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
8680 lbf
38600 N

Ca90 - Dynamic Thrust Rating (90 million revolutions)2
9310 lbf
41400 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
0.93
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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