Menu
Smarter Bearing Selection Is Here

The Timken ® Syber ® Bearing System Designer Tool now features Smart Selection, enabling users to find the right bearing faster by filtering options based on target life and key dimensions.

Learn More
Analyze Bearing Performance in an Application with Timken ® Syber ® Bearing System Designer

A powerful software tool that combines calculators and configurators to assist you with application design, bearing selection, installation, and troubleshooting. It’s free, easy-to-use, and accessible 24/7.

Learn More
Simplified Gear Force Analysis

Alex Waye, Timken Application Engineer, shows you how to instantly compute tangential, radial, and axial forces for better design decisions.

View Video
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 30306M

Cone Part Number

 N/A X30306M

Cup Part Number

 N/A Y30306M

Design Unit

 N/A Metric

Cage Material

 N/A Stamped Steel

Related Assembly Number(s)

 N/A 30306M-90KM1 30306MSLD-90KA1

Dimensions

d - Bore

 N/A 30 mm1.1811 in

D - Cup Outer Diameter

 N/A 72 mm2.8346 in

B - Cone Width

 N/A 19.000 mm0.7480 in

C - Cup Width

 N/A 16 mm0.6299 in

T - Bearing Width

 N/A 20.750 mm0.8169 in

Abutment and Fillet Dimensions

R - Cone Backface "To Clear" Radius1 N/A 1.520 mm0.06 in
r - Cup Backface "To Clear" Radius2 N/A 1.52 mm0.06 in

da - Cone Frontface Backing Diameter

 N/A 38 mm1.5 in

db - Cone Backface Backing Diameter

 N/A 40 mm1.57 in

Da - Cup Frontface Backing Diameter

 N/A 67.10 mm2.68 in

Db - Cup Backface Backing Diameter

 N/A 62.99 mm2.48 in

Ab - Cage-Cone Frontface Clearance

 N/A 3.8 mm0.15 in

Aa - Cage-Cone Backface Clearance

 N/A 0.8 mm0.03 in
a - Effective Center Location3 N/A -5.6 mm-0.22 in

Basic Load Ratings

C90 - Dynamic Radial Rating (90 million revolutions)4 N/A 17500 N3940 lbf
C1 - Dynamic Radial Rating (1 million revolutions)5 N/A 67700 N15200 lbf

C0 - Static Radial Rating

 N/A 65300 N14700 lbf
Ca90 - Dynamic Thrust Rating (90 million revolutions)6 N/A 9460 N2130 lbf

Factors

K - Factor7 N/A 1.85
e - ISO Factor8 N/A 0.31
Y - ISO Factor9 N/A 1.9

G1 - Heat Generation Factor (Roller-Raceway)

 N/A 16.8

G2 - Heat Generation Factor (Rib-Roller End)

 N/A 10.3
Cg - Geometry Factor10 N/A 0.0609
  • 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.