Part Number M255449D, Tapered Roller Bearings - Double Tapered Cones

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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 M255449D


	Part Number M255449D, 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.

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Unit of Measure: Imperial Metric Both

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

Specifications

Series

M255400

Cone Part Number

M255449D

Design Units

Imperial

Cage Type

Pin-Type

C1 - Dynamic Radial Rating (1 million revolutions)¹

267000 lbf
1190000 N

C0 - Static Radial Rating

567000 lbf
2520000 N

Note

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

¹ Based on 1 x 10⁶ revolutions L₁₀ life, for the ISO life calculation method.

Dimensions

d - Cone Bore		11.3750 in 288.925 mm

B - Double Cone Width		5.6875 in 144.463 mm

Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius¹

0.13 in
3.300 mm

da - Cone Frontface Backing Diameter

12.2 in
310 mm

Ab - Cage-Cone Frontface Clearance

0.22 in
5.6 mm

¹ These maximum fillet radii will be cleared by the bearing corners.

Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)¹

69300 lbf
308000 N

C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)²

466000 lbf
2070000 N

C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)³

121000 lbf
537000 N

C_a90 - Dynamic Thrust Rating (90 million revolutions)⁴

40100 lbf
179000 N

¹ Based on 90 x 10⁶ revolutions L₁₀ life, for The Timken Company life calculation method. C₉₀ and C_a90 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 C_a90 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 C_a90 are radial and thrust values for a single-row, C₉₀₍₂₎ is the two-row radial value.

Factors

K - Factor¹

1.73

G1 - Heat Generation Factor (Roller-Raceway)

2300

G2 - Heat Generation Factor (Rib-Roller End)

287

Cg - Geometry Factor²

0.172

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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Part Number M255449D, Tapered Roller Bearings - Double Tapered Cones - Imperial

Series

Cone Part Number

Design Units

Cage Type

C1 - Dynamic Radial Rating (1 million revolutions)1

C0 - Static Radial Rating

Note

d - Cone Bore

B - Double Cone Width

R - Cone Backface "To Clear" Radius1

da - Cone Frontface Backing Diameter

Ab - Cage-Cone Frontface Clearance

C90 - Dynamic Radial Rating (90 million revolutions)1

C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)2

C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)3

Ca90 - Dynamic Thrust Rating (90 million revolutions)4

K - Factor1