September 2022

Understanding Bearing Internal Clearance with Ceramic Hybrid Ball Bearings

Have you ever looked at a bearing part number and wondered what the suffix C3 (or C2, or C4) means? Knowing what they stand for can help you get the right ceramic hybrid bearing for your specific application. Read on, and we’ll help you “decode” this important portion of a bearing part number.

The suffixes C0 through C4 in a bearing part number refer to a bearing’s internal clearance value and have to do with what’s called “radial play”. Radial play is the radial internal clearance between the balls and races, and is the measured value of the total movement of one ring with respect to the other in a plane perpendicular to the bearing axis. Radial play can also be referred to as“internal clearance”.

The following is a list of bearing clearance values and what they mean:

  • C0 – Referred to as “standard clearance”. Normally, there are no markings on a bearing with a C0 clearance value.
  • C2 – Refers to a “less than standard clearance”. Bearings with this type of clearance are uncommon and have very limited uses.
  • C3 – Refers to a “greater than standard clearance”. This is the most common type of bearing, and is the correct choice for the majority of applications.
  • C4 – Refers to “greater than C3 clearance”. Not as common as C3, but often specified in small engine crankshaft bearings.

In any bearing, including ceramic hybrid ball bearings, some internal clearance is necessary to the ensure that the bearing turns freely, without binding. But note that these clearance values are very small. For example, a 25mm bearing with a “standard fit” will have an internal clearance of about a half a thousandth of an inch. The same bearing with a C3 fit will have about one thousandth of an inch clearance. This value is less than the diameter of a human hair! Internal clearances are also relative to the bearing’s bore size (the amount of radial play will increase as the bore size increases).

The radial play for a given bore size is not an exact value, but a range. For example, a 6205 C3 bearing (25mm bore) has a radial play value that falls between .0006” and .0010”. The same bearing in a C4 clearance has a clearance range of .0011” to .0015”. In a properly assembled bearing, the clearance will generally fall in the middle of the tolerance range.

A small amount of extra clearance is usually not a problem, but any amount of negative clearance (interference) can be a big problem, resulting in increased friction, heat, and ultimately in early fatigue failure. Therefore, it is always better to err on the side of a bearing that is a little loose, rather than one that is a little tight. It is also important to note that the radial clearance value that matters most is that when the bearing is installed and up to operating temperature.

There are certain times when it is necessary to specify a bearing with increased clearance (C3 or C4):

  • When there is a significant press fit on the shaft and/or housing
  • When there is a very slight misalignment between the bearing housing and shaft
  • When using in elevated temperatures

All three of the situations mentioned above will cause a bearing’s internal clearance to decrease. To compensate, it is important to install bearings with greater than standard internal clearances.

CBR Bearing is one of the few specialty bearing companies that measures the internal clearance of each an every ceramic hybrid ball bearing we sell. They use their own custom-built test fixtures that are accurate to .00005” (‘fifty millionths of an inch). This allows them to accurately and professionally set up the proper clearance in every bearing.

When you purchase ceramic hybrid ball bearings from CBR Bearing, you can have confidence that the products you purchase will be well made, with the proper amount of radial play. If you are ready to make a purchase, or if you have more questions about our ceramic hybrid ball bearings, contact us. We are always happy to help a customer and will make sure you get the exact bearings you need for your application.

Check out Businessing Magazine for more information more about ceramic ball bearings or other tips on small business and manufacturing.

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How to Invest in the Stock Market

Invest in a Diversified Portfolio

A diversified portfolio is one of the keys to successful stock market investing. By investing in a variety of different types of stocks, you can minimize your risk and maximize your potential for profit. There are many different ways to diversify your portfolio Paytm share price, but one simple way is to invest in a mix of large and small-cap stocks. Large-cap stocks tend to be more stable and offer less risk than small-cap stocks, but they also offer less potential for growth. Small cap stocks, on the other hand, are more volatile but offer more potential for capital gains. Another way to diversify your portfolio is to invest in both domestic and international stocks. This will help you mitigate the risk associated with investing in just one country’s stock market.

Invest in Quality Companies

Investing in quality companies is another important strategy for successful stock market investing. When you invest in quality companies, you are investing in businesses that have a proven track record of success. These companies have strong financials, experienced management teams, and solid business models. They also tend to be leaders in their respective industries. While there may be some short-term volatility with these types of stocks, over the long run they have proven to be very profitable investments.

Invest for the Long Term

Investing for the long term is another key element of successful stock market investing. When you invest for the long term, you are not trying to time the market or make quick Sensex profits; rather, you are looking to build a diversified portfolio of quality stocks that will provide you with consistent returns over time. This approach takes patience and discipline, but it is often the best way to achieve your financial goals.

Tips for Successful Stock Market Investing.

Do Your Research

When it comes to stock market investing, research is key. You need to understand what you’re buying, and why you’re buying it. That means reading up on companies, industries, and the economy as a whole. It also means being aware of the risks involved.

There are two types of risks when it comes to investing: financial risk and business risk. Financial risk is the chance that an investment will lose money. Business risk is the chance that a company will go out of business or have its stock price decline for other reasons (such as poor management).

You can reduce your financial risk by diversifying your portfolio (investing in multiple companies and industries). You can reduce your business risk by investing in quality companies with strong fundamentals (such as earnings growth, cash flow, and low debt levels).

Have a Plan

Investing without a plan is like driving without a map—you may end up somewhere, but it’s likely not where you wanted to go. A good investment plan takes into account your goals, risk tolerance, time horizon, and other factors. It should also be reviewed and updated regularly as your circumstances change.

If you don’t have the time or knowledge to create your own investment plan, there are plenty of professional advisers who can help you. Just make sure you choose someone who is qualified and whom you trust—and always get everything in writing!

Stay disciplined

Successful investors know that they need to stick to their plan even when the markets are volatile or down. That’s because they know that over time, the markets always go up again—and they want to be well-positioned when they do. They also know that trying to time the market is generally a losing proposition (most people end up buying high and selling low).

So if you want to be a successful investor, commit to staying disciplined no matter what happens in the markets. That means sticking to your asset allocation (the mix of stocks, bonds, and cash in your portfolio), rebalancing when needed, and avoiding emotionally driven decisions.


The stock market is a good investment for those who are willing to take on some risk. While it is volatile and unpredictable, it can also be very rewarding. To be successful in the stock market, it is important to do your research, have a plan, and stay disciplined. With a little bit of effort, anyone can be a successful investor.

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