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Breakout Torque for Ball Bearings

Posted On July 16, 2015

What Is Breakout Torque?

Breakout torque (also known as break out torque or break-out torque) refers to the amount of torque required to initiate relative rotation between a rotary shaft and a seal or bearing, and plays a key role in systems that involve oscillatory movement.  Breakout torque is a function of both the inertia of the mechanisms involved and static friction.  In ball bearings, you will often see it referred to as the starting torque, and there it refers specifically to the amount of torque required to start the rotation of one ring of the bearing.

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Posted in: Flanged Bearings, Self Lubricated Bearings, Polymer Bearings

4 Ball Bearing Facts You Should Know

Posted On July 06, 2015

Ball Bearing Facts

In this article, we are going to review some interesting facts about ball bearings that you should know.


Fact #1:  Who were the engineers behind the equations static load rating equations?

First, you should know the men originally behind the equations and formulas engineers use for calculating static load ratings. Richard Stribeck, a German engineer, academic, and researcher who published his groundbreaking papers on bearings in the early 1900s on which most of today’s load rating equations are still based.   In 1924, Arvid Palmgren of Sweden published a paper in Germany on the subject of bearing life and reliability.  His subsequent work with Professor Lundberg resulted in the Palmgren-Lundberg theory.  This theory evolved into ISO/ANSI/ AFBMA (Anti-Friction Bearing Manufacturers Association) standards for load ratings and life of rolling element bearings.

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Posted in: Flanged Bearings, Polymer Bearings

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