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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 31330X  
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Part Number 31330X, 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
31330M

Cone Part Number
X31330M

Cup Part Number
Y31330M

Design Unit
Metric

Cage Material
Stamped Steel


Dimensions

d - Bore
150 mm
5.9055 in

D - Cup Outer Diameter
320 mm
12.5984 in

B - Cone Width
75.000 mm
2.9528 in

C - Cup Width
50.000 mm
1.9685 in

T - Bearing Width
82.000 mm
3.2283 in


Abutment and Fillet Dimensions

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

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

da - Cone Frontface Backing Diameter
187 mm
7.36 in

db - Cone Backface Backing Diameter
210 mm
8.27 in

Da - Cup Frontface Backing Diameter
300.00 mm
11.84 in

Db - Cup Backface Backing Diameter
276.10 mm
10.87 in

Ab - Cage-Cone Frontface Clearance
8.9 mm
0.35 in

Aa - Cage-Cone Backface Clearance
18.5 mm
0.73 in

a - Effective Center Location3
18 mm
0.71 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
224000 N
50300 lbf

C1 - Dynamic Radial Rating (1 million revolutions)2
862000 N
194000 lbf

C0 - Static Radial Rating
1200000 N
270000 lbf

Ca90 - Dynamic Thrust Rating (90 million revolutions)3
316000 N
71000 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)
544.4

G2 - Heat Generation Factor (Rib-Roller End)
54.9

Cg - Geometry Factor4
0.141
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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