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All Product Types > ENGINEERED BEARINGS > Tapered Roller Bearings > Tapered Roller Bearings - Double Cones > Tapered Roller Bearings - Double Tapered Cones - Imperial > Part Number M257248DW  
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Part Number M257248DW, Tapered Roller Bearings - Double Tapered Cones - Imperial


TDI bearings have a one-piece double inner race and two single outer races and are typically supplied complete with an outer race spacer as a pre-set assembly. The bearing can be used at fixed positions on rotation shaft applications. For rotating housing application it can be used to float on the stationary shaft.



Unit of Measure: Imperial Metric Both

Specifications  · Dimensions  · Abutment and Fillet Dimensions  · Basic Load Ratings  · Factors

Specifications

Series
M257200

Cone Part Number
M257248DW

Design Units
Imperial

Cage Type
Stamped Steel

C1 - Dynamic Radial Rating (1 million revolutions)1
251000 lbf
1120000 N

C0 - Static Radial Rating
481000 lbf
2140000 N
1 Based on 1 x 106 revolutions L10 life, for the ISO life calculation method.


Dimensions

d - Cone Bore
12.0040 in
304.902 mm

B - Double Cone Width
5.0625 in
128.588 mm


Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1
0.13 in
3.300 mm

da - Cone Frontface Backing Diameter
12.8 in
325 mm

Ab - Cage-Cone Frontface Clearance
0.14 in
3.6 mm
1 These maximum fillet radii will be cleared by the bearing corners.


Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)1
65000 lbf
289000 N

C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)2
437000 lbf
1940000 N

C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)3
113000 lbf
504000 N

Ca90 - Dynamic Thrust Rating (90 million revolutions)4
35500 lbf
158000 N
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.
4 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
1.83

Cg - Geometry Factor2
0.169
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.



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