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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

Specifications

Series

 N/A HM256800

Cone Part Number

 N/A HM256849DA

Cup Part Number

 N/A HM256810

Design Unit

 N/A Inch

Cage Material

 N/A Pin-Type

Dimensions

d - Bore

 N/A 11.8125 in300.038 mm

D - Cup Outer Diameter

 N/A 16.6250 in422.275 mm

B - Double Cone Width

 N/A 5.9375 in150.813 mm

C - Cup Width

 N/A 2.5 in63.5 mm

T - Bearing Width across Cups

 N/A 5.9375 in150.813 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 0.130 in3.30 mm

da - Cone Frontface Backing Diameter

 N/A 12.785 in324.74 mm

Db - Cup Backface Backing Diameter

 N/A 15.51 in393.95 mm

Ab - Cage-Cone Frontface Clearance

 N/A 0.2 in5.1 mm

Basic Load Ratings

C90 - Dynamic Radial Rating (One-Row, 90 million revolutions)3 N/A 75600 lbf336000 N
C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)4 N/A 508000 lbf2260000 N
C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)5 N/A 132000 lbf586000 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)6 N/A 43600 lbf194000 N

Factors

K - Factor7 N/A 1.73
e - ISO Factor8 N/A 0.34
Y1 - ISO Factor9 N/A 2
Y2 - ISO Factor10 N/A 2.99
Cg - Geometry Factor11 N/A 0.178

Spacer

Note

 N/A Spacer shows standard nominal .01 radii, actual bearing may vary
  • 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 Based on 90 x 106 revolutions L10 life, for The Timken Company life calculation method. C90 and Ca90 are radial and thrust values.
  • 4 Based on 1 x 106 revolutions L10 life, for the ISO life calculation method.
  • 5 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.
  • 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 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 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 Geometry constant for Lubrication Life Adjustment Factor a3l.
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