Menu
Batch CAD Cart (0) ▾
  • Cart is empty
  1. Click Here for Batch Download
Request Information Add to CAD Cart
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 HH421200

Cone Part Number

 N/A HH421246C

Cup Part Number

 N/A HH421210

Design Unit

 N/A Inch

Cage Material

 N/A Stamped Steel

Dimensions

d - Bore

 N/A 3.8750 in98.425 mm

D - Cup Outer Diameter

 N/A 7-1/4 in184.150 mm

B - Cone Width

 N/A 2.5 in63.5 mm

C - Cup Width

 N/A 2.0625 in52.388 mm

T - Bearing Width

 N/A 2.5000 in63.500 mm

Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1 N/A 0.25 in6.35 mm
r - Cup Backface "To Clear" Radius2 N/A 0.130 in3.30 mm

da - Cone Frontface Backing Diameter

 N/A 4.53 in115.1 mm

db - Cone Backface Backing Diameter

 N/A 5 in127 mm

Da - Cup Frontface Backing Diameter

 N/A 6.95 in176.53 mm

Db - Cup Backface Backing Diameter

 N/A 6.42 in163.07 mm

Ab - Cage-Cone Frontface Clearance

 N/A 0.15 in3.8 mm

Aa - Cage-Cone Backface Clearance

 N/A 0.1 in2.5 mm
a - Effective Center Location3 N/A -0.66 in-16.8 mm

Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)4 N/A 36600 lbf163000 N
C1 - Dynamic Radial Rating (1 million revolutions)5 N/A 141000 lbf628000 N

C0 - Static Radial Rating

 N/A 174000 lbf772000 N
Ca90 - Dynamic Thrust Rating (90 million revolutions)6 N/A 23500 lbf104000 N

Factors

K - Factor7 N/A 1.56
e - ISO Factor8 N/A 0.37
Y - ISO Factor9 N/A 1.6

G1 - Heat Generation Factor (Roller-Raceway)

 N/A 298.2

G2 - Heat Generation Factor (Rib-Roller End)

 N/A 40.9
Cg - Geometry Factor10 N/A 0.116
  • 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.
By clicking Submit, you consent to the personal information you provide being used in the manner as described in our Privacy Notice, including access to that information by Timken personnel who may be located outside your home country. In addition, you agree that the CAD drawings are for your personal, one-time use only, and that you will not modify or create any compilation or derivative work using the CAD drawings or distribute or display the CAD drawings on any website or other media.