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All Product Types > ENGINEERED BEARINGS > Tapered Roller Bearings > Tapered Roller Bearings - TS (Tapered Single) > Tapered Roller Bearings - TS (Tapered Single) Metric > Part Number 31328X  
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Part Number 31328X, Tapered Roller Bearings - TS (Tapered Single) 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
31328X

Cone Part Number
X31328X

Cup Part Number
Y31328X

Design Unit
Metric

Cage Material
Stamped Steel

Related Assembly Number(s)
31328X-90KM1


Dimensions

d - Bore
140 mm
5.5118 in

D - Cup Outer Diameter
300 mm
11.811 in

B - Cone Width
70 mm
2.7559 in

C - Cup Width
47 mm
1.8504 in

T - Bearing Width
77 mm
3.0315 in


Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1
5 mm
0.200 in

r - Cup Backface "To Clear" Radius2
4 mm
0.16 in

da - Cone Frontface Backing Diameter
171 mm
6.73 in

db - Cone Backface Backing Diameter
199 mm
7.83 in

Da - Cup Frontface Backing Diameter
280.4 mm
11.04 in

Db - Cup Backface Backing Diameter
257 mm
10.12 in

Ab - Cage-Cone Frontface Clearance
9.7 mm
0.38 in

Aa - Cage-Cone Backface Clearance
16.5 mm
0.65 in

a - Effective Center Location3
16.5 mm
0.65 in
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
233000 N
52500 lbf

C1 - Dynamic Radial Rating (1 million revolutions)2
900000 N
202000 lbf

C0 - Static Radial Rating
1020000 N
230000 lbf

Ca90 - Dynamic Thrust Rating (90 million revolutions)3
330000 N
74100 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
0.71

e - ISO Factor2
0.83

Y - ISO Factor3
0.73

G1 - Heat Generation Factor (Roller-Raceway)
424.5

G2 - Heat Generation Factor (Rib-Roller End)
45.2

Cg - Geometry Factor4
0.129
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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