Menu
Batch CAD Cart (0) ▾
  • Cart is empty
  1. Click Here for Batch Download
Request Information Add to CAD Cart
The configuration of the TDO provides a wide effective bearing spread, making it ideal for applications in which overturning moments are a significant load component. TDO bearings can be used in fixed positions or allowed to float in the housing bore.
Unit of Measure

Specifications

Series

 N/A HM256800

Cone Part Number

 N/A HM256849

Cup Part Number

 N/A HM256810CD

Design Unit

 N/A Inch

Cage Material

 N/A Pin-Type

Related Assembly Number(s)

 N/A HM256849-90069 HM256849-90070 HM256849-90071 HM256849-90073 HM256849-902A2 HM256849-902A3 HM256849-902B1 HM256849-902B3 HM256849-902C4 HM256849-902C8 HM256849-902E2 HM256849-902F1

Dimensions

d - Bore

 N/A 11.8125 in300.038 mm

D - Cup Outer Diameter

 N/A 16.6250 in422.275 mm

B - Cone Width

 N/A 3.2500 in82.550 mm

C - Double Cup Width

 N/A 5.3750 in136.525 mm

T - Bearing Width across Cones

 N/A 6.8750 in174.625 mm

Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1 N/A 0.25 in6.4 mm
r - Cup Backface "To Clear" Radius2 N/A 0.06 in1.5 mm

db - Cone Backface Backing Diameter

 N/A 12.91 in328 mm

Da - Cup Frontface Backing Diameter

 N/A 15.95 in405.10 mm

Aa - Cage-Cone Backface Clearance

 N/A 0.22 in5.6 mm
a - Effective Center Location3 N/A -0.22 in-5.6 mm

Basic Load Ratings

C90 - Dynamic Radial Rating (One-Row, 90 million revolutions)4 N/A 75600 lbf336000 N
C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)5 N/A 508000 lbf2260000 N
C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)6 N/A 132000 lbf586000 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)7 N/A 43600 lbf194000 N

Factors

K - Factor8 N/A 1.73
e - ISO Factor9 N/A 0.34
Y1 - ISO Factor10 N/A 2
Y2 - ISO Factor11 N/A 2.99
Cg - Geometry Factor12 N/A 0.178
  • 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.
  • 4 Based on 90 x 106 revolutions L10 life, for The Timken Company life calculation method. C90 and Ca90 are radial and thrust values.
  • 5 Based on 1 x 106 revolutions L10 life, for the ISO life calculation method.
  • 6 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.
  • 7 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.
  • 8 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 9 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 10 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 11 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 12 Geometry constant for Lubrication Life Adjustment Factor a3l.
By clicking Submit, you consent to the personal information you provide being used in the manner as described in our Privacy Notice, including access to that information by Timken personnel who may be located outside your home country. In addition, you agree that the CAD drawings are for your personal, one-time use only, and that you will not modify or create any compilation or derivative work using the CAD drawings or distribute or display the CAD drawings on any website or other media.