Part Number EE122080, Tapered Roller Bearings - Single Cones - Imperial
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

Cone Part Number

EE122080

Design Units

Imperial

Cage Type

Stamped Steel
C1 - Dynamic Radial Rating (Two-Row, 1 million revolutions)1298000 lbf1330000 N
C90(2) - Dynamic Radial Rating (Two-Row, 90 million revolutions)277300 lbf344000 N

Dimensions

d - Cone Bore

8 in203.2 mm

B - Cone Width

2.6250 in66.675 mm

Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius30.170 in4.320 mm

da - Cone Frontface Backing Diameter

8.58 in218 mm

db - Cone Backface Backing Diameter

8.86 in225 mm

Ab - Cage-Cone Frontface Clearance

0.11 in2.8 mm

Aa - Cage-Cone Backface Clearance

0.25 in6.4 mm
a - Effective Center Location4-0.44 in-11.2 mm

Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)544400 lbf197000 N
C1 - Dynamic Radial Rating (1 million revolutions)6171000 lbf761000 N

C0 - Static Radial Rating

292000 lbf1300000 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)722500 lbf100000 N

Factors

K - Factor81.97

G1 - Heat Generation Factor (Roller-Raceway)

951.5

G2 - Heat Generation Factor (Rib-Roller End)

141.7
Cg - Geometry Factor90.123
  • 1 Based on 1 x 106 revolutions L10 life, for the ISO life calculation method.
  • 2 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.
  • 3 These maximum fillet radii will be cleared by the bearing corners.
  • 4 Negative value indicates effective center inside cone backface.
  • 5 Based on 90 x 106 revolutions L10 life, for The Timken Company life calculation method. C90 and Ca90 are radial and thrust values.
  • 6 Based on 1 x 106 revolutions L10 life, for the ISO life calculation method.
  • 7 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.
  • 8 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 9 Geometry constant for Lubrication Life Adjustment Factor a3l.

Part Number 122125, Tapered Roller Bearings - Single Cups - Imperial
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

122000

Cup Part Number

122125

Design Units

Imperial

Dimensions

D - Cup Outer Diameter

12.5000 in317.500 mm

C - Cup Width

2 in50.8 mm

Abutment and Fillet Dimensions

r - Cup Backface "To Clear" Radius10.130 in3.30 mm

Da - Cup Frontface Backing Diameter

11.73 in297.90 mm

Db - Cup Backface Backing Diameter

11.57 in293.88 mm

Factors

K - Factor21.97
e - ISO Factor30.3
Y - ISO Factor42.03

G1 - Heat Generation Factor (Roller-Raceway)

951.5

G2 - Heat Generation Factor (Rib-Roller End)

141.7
Cg - Geometry Factor50.123
  • 1 These maximum fillet radii will be cleared by the bearing corners.
  • 2 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 3 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 4 These factors apply for both inch and metric calculations. Consult your Timken representative for instruction on use.
  • 5 Geometry constant for Lubrication Life Adjustment Factor a3l.