Ceramic Vs Steel Bearings

Ceramic bearings have become more popular over the last 15 years. There are many reasons for their increased use over steel. Perhaps the greatest benefit of ceramic bearings is that they weigh considerably less. The lighter ball allows the bearing to spin faster and uses less energy to maintain its speed. This reduces energy costs in comparison to steel run operations. Ceramics are rounder and less compressible, enabling parts to be made to tighter tolerances with less vibration. Another benefit is that it does not conduct electrical current which can cause damage to its steel counterpart. They are also chemically inert, so they do not oxidize and rust. They can operate in a wider range of temperatures and environments, and last 2 – 5 times longer than steel. Ceramic bearings do cost more initially, but when you take into consideration the lower maintenance costs and the longer life in addition to the many other benefits it becomes an option worth looking at.

However, aside from cost there are a few other downsides to ceramic bearings. The ceramic balls are harder than bearing raceways. This increases the chance of brinelling the bearings when they are subjected to impact loads. Last but not least, ceramic bearings are less common than their steel counterparts so availability can sometimes be an issue.

Northland Tool & Electronics has converted many spindles from steel to ceramic and we would like the opportunity to discuss the pros and cons regarding your specific application.

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