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All Product Types > ENGINEERED BEARINGS > Tapered Roller Bearings > Tapered Roller Bearings - Single Cones > Tapered Roller Bearings - Single Cones - Metric > Part Number JHM840449A  
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Part Number JHM840449A, Tapered Roller Bearings - Single Cones - Metric


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

Series
HM840400

Cone Part Number
JHM840449A

Design Units
METRIC

Cage Type
Stamped Steel

C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)1
1210000 N
272000 lbf

C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)2
314000 N
70500 lbf

Full Timken Part Number
HM840400
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
200 mm
7.874 in

B - Cone Width
62 mm
2.4409 in


Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1
9.650 mm
0.380 in

da - Cone Frontface Backing Diameter
214.6 mm
8.45 in

db - Cone Backface Backing Diameter
235 mm
9.25 in

Ab - Cage-Cone Frontface Clearance
7.1 mm
0.28 in

Aa - Cage-Cone Backface Clearance
3.8 mm
0.15 in

a - Effective Center Location2
8.1 mm
0.32 in
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
180000 N
40500 lbf

C1 - Dynamic Radial Rating (1 million revolutions)2
695000 N
156000 lbf

C0 - Static Radial Rating
1280000 N
287000 lbf

Ca90 - Dynamic Thrust Rating (90 million revolutions)3
161000 N
36200 lbf
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.


Factors

K - Factor1
1.12

G1 - Heat Generation Factor (Roller-Raceway)
853.6

G2 - Heat Generation Factor (Rib-Roller End)
126.4

Cg - Geometry Factor2
0.143
1 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
2 Geometry constant for Lubrication Life Adjustment Factor a3l.



 DOWNLOADS 

Tapered Roller Bearing Engineering Information
(PDF, 663KB)

Bearing Life Calculation Tool

Bearing Dimensional Tolerances


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