Four Ball Tester

The Four Ball Tester is an excellent development and quality check instrument for developers and users of lubricants and additives. The unique sample configuration of three bottom balls and one top ball makes a very stable and a repeatable contact in-turn, allowing tests results to be very repeatable.

Enquiry Email:

Do you want to know more about this product?

Please complete the enquiry form below with your details and questions and we will get back to you.

The Four Ball Tester can be used to determine Wear Preventive properties (WP), Extreme Pressure properties (EP) and friction behavior of lubricants. The wide acceptance of test results of the Four Ball Tester make it an excellent choice to benchmark products. It is a good choice for R&D due to its relatively inexpensive samples and ability to produce quick and repeatable results.

A rotating steel ball is pressed against three steel balls firmly held together and immersed in lubricant under test. The test load, duration, temperature and rotational speed are set in accordance with standard test schedule. In Wear Preventive (WP) tests – also called Anti Wear (AW) tests – the average scar diameter on the bottom three balls is reported. The size of the scar shows the ability of the lubricant to prevent wear. A larger diameter indicates poor wear preventive property while a smaller indicates superior wear preventive property.

In Extreme Pressure (EP) tests the lubricant is subjected to load that is increased in specified steps after every run. This increase in loading is continued till a load is reached where the lubricant fails. The failure of lubricant is indicated by welding of the bottom three balls to the top ball. The load at which welding occurs is the index of extreme pressure property of the lubricant.

Enquiry Email:


Ducom Instruments

Founded in 1978, Ducom Instruments has led the way in designing and manufacturing advanced materials testing instruments with a specialization in tribology. Applying cutting-edge technology and strong design principles to its products, Ducom focusses on providing customers with an excellent ownership experience starting with ease of use and maintenance. Our locations in the United States, The Netherlands and in India each have an in-house Research & Development initiative coupled with development partnerships with world renowned institutions. As a result, Ducom holds several proprietary technologies, copyrights and patents with additional filings every year. Many of these technologies are applied to our instruments, and work in the background so users can enjoy better results and user experiences. Our instruments use components that are manufactured in an AS9100:2009 certified “aerospace grade” manufacturing facility for excellent quality. We also designed and put into place an active and distributed customer support architecture, which allows our support team to address support requests in multiple modes which including remote support via video conferencing for quick and low cost support to personal visits by our engineers for full on-site support. Our instruments are operational all over the world. Research labs working on cutting edge technology development which requires advanced and highly configurable test systems to standardized quality control requirements which rely on highly repeatable systems to accurately monitor product quality test instruments by Ducom.


There are no reviews yet.

Be the first to review “Four Ball Tester”

Your email address will not be published. Required fields are marked *