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Bearing Grease Consistency White Paper

November 23, 2011 by Paul Wharton
Bearing Grease

Bearing grease consistency can greatly impact performance.

Bearing grease consistency can greatly affect the performance of the bearing and consequently the performance of the mechanical device or product.

Most people are familiar with the term “viscosity” as the measurable consistency of oil lubricants.  However, the average person probably does not know what the equivalent measurement for the consistency of grease (hint: it’s not viscosity). Bearing grease consistency is measured in “penetration levels.”

AST Bearings has created a mini white paper which covers the topic of “Bearing Grease Consistency.”  In it the following topics are covered:

  • Grease Penetration Definition
  • How is Unworked Penetration Measured?
  • How is Worked Penetration Measured?
  • Comparing Worked and Unworked Penetration
  • Channeling Grease Characteristics
  • Grease Consistency Plays Role in Preventing Fretting Corrosion

You can learn more about bearing grease consistency at AST’s Bearing Resource Center.


  1. I have wanted to post something like this on my site and you have given me an idea. Cheers.

    Comment by small cars — November 27, 2011 @ 1:40 AM

  2. Good post! This is the kind of information that should be distributed on the online community. I would like to read more of this.

    Comment by Andrew J. Gephart — November 28, 2011 @ 12:44 PM

  3. Thanks for the article on grease consistency. It answers a lot of questions I had about grease. However, I am wondering about how long a grease is good for. I mean, do they expire? I know that they can break down depending on use, but do greases have expirations or life expectancies? Please let me know if you can. Thx!

    Comment by George Mueller — November 29, 2011 @ 5:37 PM

  4. George, we’re glad that you found our new article on “Bearing Grease Consistency” helpful.

    To answer your question about bearing grease life expectancy, “yes” lubricants to have expiration dates associated with them. We go into great detail about them in our white paper entitled, “The Shelf Life of Lubricants in Precision Ball Bearings.” You can find this and other helpful white papers about bearings at: http://www.astbearings.com/technical-information.html

    Comment by Paul Wharton — November 29, 2011 @ 5:43 PM

  5. Fantastic post, I really look forward to updates from you.

    Comment by Christine — November 30, 2011 @ 10:57 PM

  6. Would you mind if I placed this blog post on my web site? I would certainly give you credit and a link back to your webpage. Thank you, and don’t hesitate to let me know here, or email me!

    Comment by MotionControlKing — January 19, 2012 @ 7:29 PM

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