Tech Talk Blog

Q&A - How does your CJ Bearing Compare to Nylon 6 with Moly Additives?

Posted by Dave Biering

June 26, 2018

Nylon 6

We had a longtime customer contact us recently to ask if we had a replacement for the Nylon 6 bearings they were using in their application. The bearings, which were occasionally exposed to moisture, were failing prematurely.

Nylon 6 is a moly-filled cast material which has many excellent characteristics for bearing applications, including excellent vibration resistance, high fatigue/corrosion resistance, and wear resistance that is among the best of all polymers.

However, there is one drawback to the material: The material’s inherent tendency to absorb moisture. The material swells due to this this exposure, and the constant absorption and drying cycle leads to fatigue failure over time.

Fortunately, we have the perfect solution!

Our CJ composite bearing has zero absorption in moisture, is stronger in terms of compressive strength and resistance to deformation, has a thermal expansion rate the same as steel and has a very low friction. In addition, since the CJ requires no lubrication, it is as close to maintenance free as you can get.

In independent testing, it was shown that wear life of the CJ is significantly better as well. In rotary wear tests we found that the Nylon/MOS2 had a weight loss of over 180mg after 50 hours. The CJ had 100.5 mg of loss in the same test. Load for the test was 2000 psi at 25 sfpm and temperatures and humidity were controlled in the lab at 78°F and 50% humidity.

For more information on the CJ Bearing products visit and check out Technical Library for numerous application examples. If we can answer any questions about CJ bearings and how it compares to Nylon 6 (or any other material) please feel free to reach out.

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Topics: CJ Bearings

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