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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 31312  
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Part Number 31312, 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
31312M

Cone Part Number
X31312M

Cup Part Number
Y31312M

Design Unit
Metric

Cage Material
Stamped Steel

Related Assembly Number(s)
31312-90KA3
31312-9X025
31312-9X245


Dimensions

d - Bore
60 mm
2.3622 in

D - Cup Outer Diameter
130 mm
5.1181 in

B - Cone Width
31.000 mm
1.2205 in

C - Cup Width
22.000 mm
0.8661 in

T - Bearing Width
33.500 mm
1.3189 in


Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1
3.050 mm
0.12 in

r - Cup Backface "To Clear" Radius2
2.54 mm
0.1 in

da - Cone Frontface Backing Diameter
74 mm
2.91 in

db - Cone Backface Backing Diameter
89 mm
3.5 in

Da - Cup Frontface Backing Diameter
123.70 mm
4.87 in

Db - Cup Backface Backing Diameter
111.00 mm
4.37 in

Ab - Cage-Cone Frontface Clearance
4.6 mm
0.18 in

Aa - Cage-Cone Backface Clearance
5.1 mm
0.2 in

a - Effective Center Location3
7.6 mm
0.3 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
48100 N
10800 lbf

C1 - Dynamic Radial Rating (1 million revolutions)2
186000 N
41700 lbf

C0 - Static Radial Rating
188000 N
42200 lbf

Ca90 - Dynamic Thrust Rating (90 million revolutions)3
68000 N
15300 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)
56.2

G2 - Heat Generation Factor (Rib-Roller End)
23.5

Cg - Geometry Factor4
0.0792
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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