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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 31320X  
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Part Number 31320X, 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
31320X

Cone Part Number
X31320XM

Cup Part Number
Y31320XM

Design Unit
Metric

Cage Material
Stamped Steel

Related Assembly Number(s)
31320XM-90KA2


Dimensions

d - Bore
100 mm
3.937 in

D - Cup Outer Diameter
215 mm
8.4646 in

B - Cone Width
51 mm
2.0079 in

C - Cup Width
35 mm
1.378 in

T - Bearing Width
56.5 mm
2.2244 in


Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1
4 mm
0.157 in

r - Cup Backface "To Clear" Radius2
3 mm
0.12 in

da - Cone Frontface Backing Diameter
122.9 mm
4.84 in

db - Cone Backface Backing Diameter
144 mm
5.67 in

Da - Cup Frontface Backing Diameter
202 mm
7.95 in

Db - Cup Backface Backing Diameter
183.9 mm
7.24 in

Ab - Cage-Cone Frontface Clearance
8.6 mm
0.34 in

Aa - Cage-Cone Backface Clearance
9.7 mm
0.38 in

a - Effective Center Location3
11.4 mm
0.45 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
114000 N
25700 lbf

C1 - Dynamic Radial Rating (1 million revolutions)2
441000 N
99100 lbf

C0 - Static Radial Rating
526000 N
118000 lbf

Ca90 - Dynamic Thrust Rating (90 million revolutions)3
161000 N
36300 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)
196.1

G2 - Heat Generation Factor (Rib-Roller End)
30.1

Cg - Geometry Factor4
0.12
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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