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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 X31307  
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Part Number X31307, 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
31307

Cone Part Number
X31307

Design Units
METRIC

Cage Type
Stamped Steel

C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)1
150000 N
33800 lbf

C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)2
39000 N
8760 lbf

Full Timken Part Number
31307
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
35 mm
1.3780 in

B - Cone Width
21.000 mm
0.8268 in


Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1
2.030 mm
0.08 in

da - Cone Frontface Backing Diameter
45 mm
1.77 in

db - Cone Backface Backing Diameter
56 mm
2.2 in

Ab - Cage-Cone Frontface Clearance
3.6 mm
0.14 in

Aa - Cage-Cone Backface Clearance
2.5 mm
0.1 in

a - Effective Center Location2
3.3 mm
0.13 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
22400 N
5030 lbf

C1 - Dynamic Radial Rating (1 million revolutions)2
86300 N
19400 lbf

C0 - Static Radial Rating
74800 N
16800 lbf

Ca90 - Dynamic Thrust Rating (90 million revolutions)3
31600 N
7110 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

G1 - Heat Generation Factor (Roller-Raceway)
17.8

G2 - Heat Generation Factor (Rib-Roller End)
8.7

Cg - Geometry Factor2
0.0839
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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