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Part Number X31312M
Part Number X31312M, Tapered Roller Bearings - Single Cones - Metric
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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.
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Specifications
·
Dimensions
·
Abutment and Fillet Dimensions
·
Basic Load Ratings
·
Factors
Specifications
Series
31312M
Cone Part Number
X31312M
Design Units
METRIC
Cage Type
Stamped Steel
C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)
1
323000
N
72700
lbf
C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)
2
83800
N
18800
lbf
Full Timken Part Number
31312
1
Based on 1 x 10
6
revolutions L
10
life, for the ISO life calculation method.
2
Based on 90 x 10
6
revolutions L
10
life, for The Timken Company life calculation method. C
90
and C
a90
are radial and thrust values for a single-row, C
90(2)
is the two-row radial value.
Dimensions
d - Cone Bore
60
mm
2.3622
in
B - Cone Width
31.000
mm
1.2205
in
Abutment and Fillet Dimensions
R - Cone Backface "To Clear" Radius
1
3.050
mm
0.12
in
da - Cone Frontface Backing Diameter
74
mm
2.91
in
db - Cone Backface Backing Diameter
89
mm
3.5
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 Location
2
7.6
mm
0.3
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
48100
N
10800
lbf
C1 - Dynamic Radial Rating (1 million revolutions)
2
186000
N
41700
lbf
C0 - Static Radial Rating
188000
N
42200
lbf
C
a90
- Dynamic Thrust Rating (90 million revolutions)
3
68000
N
15300
lbf
1
Based on 90 x 10
6
revolutions L
10
life, for The Timken Company life calculation method. C
90
and C
a90
are radial and thrust values.
2
Based on 1 x 10
6
revolutions L
10
life, for the ISO life calculation method.
3
Based on 90 x 10
6
revolutions L
10
life, for The Timken Company life calculation method. C
90
and C
a90
are radial and thrust values for a single-row, C
90(2)
is the two-row radial value.
Factors
K - Factor
1
0.71
G1 - Heat Generation Factor (Roller-Raceway)
56.2
G2 - Heat Generation Factor (Rib-Roller End)
23.5
Cg - Geometry Factor
2
0.0792
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.
VIEW CAD DRAWING
·
3D
·
2D ISO View
·
2D Sales Drawing
DOWNLOADS
Tapered Roller Bearing Engineering Information
(PDF, 663KB)
Bearing Life Calculation Tool
Bearing Dimensional Tolerances
