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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 HM256849D

Design Units

 N/A Imperial

Cage Type

 N/A Pin-Type
C1 - Dynamic Radial Rating (1 million revolutions)1 N/A 292000 lbf1300000 N

C0 - Static Radial Rating

 N/A 622000 lbf2770000 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 11.8125 in300.038 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 12.68 in322 mm

Ab - Cage-Cone Frontface Clearance

 N/A 0.2 in5.1 mm

Basic Load Ratings

C90 - Dynamic Radial Rating (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

G1 - Heat Generation Factor (Roller-Raceway)

 N/A 2550

G2 - Heat Generation Factor (Rib-Roller End)

 N/A 282
Cg - Geometry Factor8 N/A 0.178
  • 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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