All Product Types > ENGINEERED BEARINGS > Tapered Roller Bearings > Tapered Roller Bearings - Single Cones > Tapered Roller Bearings - Single Cones - Imperial > Part Number NA385  

Part Number NA385, 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

42200 lbf
188000
N

C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)2

10900 lbf
48700
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

2.1654 in
55.001
mm

B - Cone Width

1.03125 in
26.194
mm


Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1

0.14 in
3.5
mm

db - Cone Backface Backing Diameter

2.64 in
67
mm

Ab - Cage-Cone Frontface Clearance

-0.0515625 in
-1.3097
mm

Aa - Cage-Cone Backface Clearance

0.103125 in
2.6194
mm

a - Effective Center Location2

-0.12 in
-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

6280 lbf
28000
N

Ca90 - Dynamic Thrust Rating (90 million revolutions)2

3810 lbf
16900
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

1.65
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