All Product Types
>
ENGINEERED BEARINGS
>
Tapered Roller Bearings
>
Tapered Roller Bearings - Single Cones
>
Tapered Roller Bearings - Single Cones - Metric
>
Part Number X31318M
Part Number X31318M, Tapered Roller Bearings - Single Cones - Metric
Download PDF
Download PDF
Printable Page
Email This Page
Save To Favorites
Please wait…
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.
larger image
larger image
Specifications
·
Dimensions
·
Abutment and Fillet Dimensions
·
Basic Load Ratings
·
Factors
Specifications
Series
31318M
Cone Part Number
X31318M
Design Units
METRIC
Cage Type
Stamped Steel
C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)
1
564000
N
127000
lbf
C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)
2
146000
N
32900
lbf
Full Timken Part Number
31318
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
90
mm
3.5433
in
B - Cone Width
43
mm
1.6929
in
Abutment and Fillet Dimensions
R - Cone Backface "To Clear" Radius
1
4.060
mm
0.16
in
da - Cone Frontface Backing Diameter
117
mm
4.61
in
db - Cone Backface Backing Diameter
128
mm
5.04
in
Ab - Cage-Cone Frontface Clearance
6.6
mm
0.26
in
Aa - Cage-Cone Backface Clearance
6.9
mm
0.27
in
a - Effective Center Location
2
13.2
mm
0.52
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
84000
N
18900
lbf
C1 - Dynamic Radial Rating (1 million revolutions)
2
324000
N
72800
lbf
C0 - Static Radial Rating
421000
N
94600
lbf
C
a90
- Dynamic Thrust Rating (90 million revolutions)
3
119000
N
26700
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)
169.3
G2 - Heat Generation Factor (Rib-Roller End)
37.1
Cg - Geometry Factor
2
0.114
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
