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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 HM256848DWH

Design Units

 N/A Imperial

Cage Type

 N/A Stamped Steel
C1 - Dynamic Radial Rating (1 million revolutions)1 N/A 321000 lbf1430000 N

C0 - Static Radial Rating

 N/A 587000 lbf2610000 N

Note

 N/A This part has a non-standard shoulder design. Please email customer CAD for shoulder details to ensure the proper design of mating components.

Dimensions

d - Cone Bore

 N/A 11.7500 in298.450 mm

B - Double Cone Width

 N/A 5.9375 in150.813 mm

Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius2 N/A 0.13 in3.300 mm

da - Cone Frontface Backing Diameter

 N/A 12.48 in317 mm

Ab - Cage-Cone Frontface Clearance

 N/A 0.19 in4.8 mm

Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)3 N/A 83300 lbf371000 N
C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)4 N/A 560000 lbf2490000 N
C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)5 N/A 145000 lbf645000 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)6 N/A 48000 lbf214000 N

Factors

K - Factor7 N/A 1.73
Cg - Geometry Factor8 N/A 0.175
  • 1 Based on 1 x 106 revolutions L10 life, for the ISO life calculation method.
  • 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 Geometry constant for Lubrication Life Adjustment Factor a3l.
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