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All Product Types > ENGINEERED BEARINGS > Tapered Roller Bearings > Tapered Roller Bearings - TS (Tapered Single) > Tapered Roller Bearings - TS (Tapered Single) Imperial > Part Number HM259048 - HM259010  
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Part Number HM259048 - HM259010, Tapered Roller Bearings - TS (Tapered Single) 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

Series
HM259000

Cone Part Number
HM259048

Cup Part Number
HM259010

Design Unit
Inch

Cage Material
Stamped Steel


Dimensions

d - Bore
12.5000 in
317.500 mm

D - Cup Outer Diameter
17.6250 in
447.675 mm

B - Cone Width
3.3750 in
85.725 mm

C - Cup Width
2.6875 in
68.263 mm

T - Bearing Width
3.3750 in
85.725 mm


Abutment and Fillet Dimensions

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

r - Cup Backface "To Clear" Radius2
0.130 in
3.30 mm

da - Cone Frontface Backing Diameter
13.27 in
337 mm

db - Cone Backface Backing Diameter
13.43 in
341 mm

Da - Cup Frontface Backing Diameter
16.85 in
427.99 mm

Db - Cup Backface Backing Diameter
16.46 in
418.08 mm

Ab - Cage-Cone Frontface Clearance
0.2 in
5.1 mm

Aa - Cage-Cone Backface Clearance
0.21 in
5.3 mm

a - Effective Center Location3
-0.19 in
-4.8 mm
1 These maximum fillet radii will be cleared by the bearing corners.
2 These maximum fillet radii will be cleared by the bearing corners.
3 Negative value indicates effective center inside cone backface.


Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)1
98500 lbf
438000 N

C1 - Dynamic Radial Rating (1 million revolutions)2
380000 lbf
1690000 N

C0 - Static Radial Rating
628000 lbf
2790000 N

Ca90 - Dynamic Thrust Rating (90 million revolutions)3
56500 lbf
251000 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 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
1.74

e - ISO Factor2
0.33

Y - ISO Factor3
1.79

G1 - Heat Generation Factor (Roller-Raceway)
2711.5

G2 - Heat Generation Factor (Rib-Roller End)
280.9

Cg - Geometry Factor4
0.181
1 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
2 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
3 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
4 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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