Montage of Timken Bearing Products
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This is the most basic and most widely used type of tapered roller bearing. It consists of two main separable parts: the cone (inner ring) assembly and the cup (outer ring). It is typically mounted in opposing pairs on a shaft.
Unit of Measure

Specifications

Series

 N/A 647000

Cone Part Number

 N/A EE647220

Cup Part Number

 N/A 647285

Design Unit

 N/A Inch

Cage Material

 N/A Pin-Type

Related Assembly Number(s)

 N/A EE647220-902A2

Dimensions

d - Bore

 N/A 22 in558.8 mm

D - Cup Outer Diameter

 N/A 28.5000 in723.900 mm

B - Cone Width

 N/A 2.875 in73.025 mm

C - Cup Width

 N/A 2.2500 in57.150 mm

T - Bearing Width

 N/A 2.8750 in73.025 mm

Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1 N/A 0.190 in4.830 mm
r - Cup Backface "To Clear" Radius2 N/A 0.190 in4.83 mm

da - Cone Frontface Backing Diameter

 N/A 22.91 in582 mm

db - Cone Backface Backing Diameter

 N/A 23.15 in588 mm

Da - Cup Frontface Backing Diameter

 N/A 27.64 in702.10 mm

Db - Cup Backface Backing Diameter

 N/A 27.05 in687.07 mm

Ab - Cage-Cone Frontface Clearance

 N/A 0.21 in5.33 mm

Aa - Cage-Cone Backface Clearance

 N/A 0.26 in6.6 mm
a - Effective Center Location3 N/A 2.54 in64.5 mm

Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)4 N/A 89500 lbf398000 N
C1 - Dynamic Radial Rating (1 million revolutions)5 N/A 345000 lbf1540000 N

C0 - Static Radial Rating

 N/A 773000 lbf3440000 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)6 N/A 75700 lbf337000 N

Factors

K - Factor7 N/A 1.18
e - ISO Factor8 N/A 0.49
Y - ISO Factor9 N/A 1.21

G1 - Heat Generation Factor (Roller-Raceway)

 N/A 5590

G2 - Heat Generation Factor (Rib-Roller End)

 N/A 804.2
Cg - Geometry Factor10 N/A 0.257
  • 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 Negative value indicates effective center inside cone backface.
  • 4 Based on 90 x 106 revolutions L10 life, for The Timken Company life calculation method. C90 and Ca90 are radial and thrust values.
  • 5 Based on 1 x 106 revolutions L10 life, for the ISO life calculation method.
  • 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 Geometry constant for Lubrication Life Adjustment Factor a3l.