Part Number 78549D, Tapered Roller Bearings - Double Tapered Cup

The Timken Company
4500 Mt Pleasant St. NW
N. Canton, OH 44720
Phone: (234) 262-3000
E-Mail: CustomerCAD@timken.com • Web site: www.timken.com

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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.

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Unit of Measure

Key Dimensions | Other Dimensions | Factors

Key Dimensions

Cup Part Number	N/A 78549D
O.D. (D)	N/A 5.5000 in139.700 mm
e Factor ¹	N/A 0.87
K Factor ²	N/A 0.67

Other Dimensions

Outer Ring Width (C)	N/A 2.0395 in51.803 mm
Max Housing Fillet Radius³	N/A 0.06 in1.5 mm
Housing Backing Shoulder Dia. - Frontface (Da)	N/A 5.19 in131.83 mm

Factors

Y1 Factor ⁴	N/A 0.78
Y2 Factor ⁵	N/A 1.16
G1 Factor	N/A 71.3
G2 Factor	N/A 17.6
Geometry Factor (Cg)⁶	N/A 0.0926

¹ These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
² These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
³ These maximum fillet radii will be cleared by the bearing corners.
⁴ These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
⁵ These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
⁶ Geometry constant for Lubrication Life Adjustment Factor a3l.

Key Dimensions

Cup Part Number

O.D. (D)

Other Dimensions

Outer Ring Width (C)

Housing Backing Shoulder Dia. - Frontface (Da)

Factors

G1 Factor

G2 Factor