The second digit of the basic number tells us what series the bearing is from and is used to signify how tough the bearing is. In our example, it’s (0) Which tells us its extra light toughness.

Typically bearing codes are comprised of a ‘basic number’ and depending on the bearing they can have supplementary codes at the beginning or the end of the basic number. These are the prefix and suffix codes.

Bearing lookup

Suffixes indicate bearings with additional special characteristics or designs. They are typically used to provide information about how the bearing is sealed. In our example, it’s (2RS) which tells us our bearing is sealed on both sides.

Bearings

Next, measure the outer diameter of the ball bearing. Position the measuring tool on the flat surface and place the outer edges of the caliper or micrometer jaws or anvils against the opposite sides of the bearings outer surface. Ensure the tool is at a right angle to the bearing. Read and record the measurement displayed on the caliper or micrometer. This value represents the outer diameter of the bearing.

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Ball bearings are essential components in many mechanical systems, including vehicles, industrial machinery, and household appliances. They help reduce friction and allow for smooth movement between two surfaces. Selecting the correct ball bearing is vital for various reasons, as it directly affects the performance, efficiency, safety, and potential downtime of a wide range of machines and equipment. To ensure proper functioning, it is important to know the type and size of a ball bearing.

The third and fourth digits tell you the bore size or (ID) of the bearing you have. In our example, it’s (0) which tells us the bearing has a 12 mm bore size.

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This guide aims to assist, you the customer in measuring ball bearings accurately to make sure you select the correct bearing for your specific application. Proper measurement is crucial in identifying the appropriate ball bearing size and type, as well as interpreting bearing codes to make an informed choice. Let’s go through the step-by-step process of measuring a ball bearing and understanding bearing codes.

The first digit of the basic number tells you about the type of bearing you have. In our example, it’s (6) So this tells us it’s a Single row deep groove ball bearing.

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In some cases, your bearing may have an additional suffix such as C3. This can be found on the outside diameter of the bearing except in the case of CN. This refers to the bearings clearance code. See the table below for examples.

In conclusion, mastering the art of measuring ball bearings and understanding bearing codes is vital for anyone involved in mechanical or industrial applications. By following the steps outlined in this guide, you can confidently and accurately determine crucial parameters like inner and outer diameters, width, and radial play.

Furthermore, decoding bearing designations enables you to select the right bearing for your specific needs, optimizing performance and longevity. Remember that precision is paramount, and a well-measured bearing is essential for efficient machinery and reliable operation.

The size of a ball bearing can be determined by measuring its outer diameter (OD), bore size (ID), and width. These measurements are usually expressed in millimetres (mm). Using a calliper or a micrometer, you can accurately measure these dimensions.

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Ball bearings usually have their identification code stamped or lasered on the outside diameter of the bearing itself, using this is the best way to ensure you select the right bearing.

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Here's a guide to help you understand the different types of ball bearings, what their uses are, and which brands and sizes are best suited to your applications.

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Deep groove ball bearing

For ball bearings with a cylindrical shape, measure the width or thickness of the bearing. Place the bearing on a flat clean surface and align the jaws or anvils of the measuring tool against opposite sides of the bearing. Read and record the measurement displayed on the caliper or micrometer. This value represents the width of the bearing.

It is important to note that different manufacturers can have their own specific Prefix and Suffix codes. Our tables give you some examples of the most common codes. If in doubt please check with the manufacturer of your bearing for exact information.

Bearings very rarely have a prefix code. However, you may come across one that does. The prefix is used to highlight the parts used by the manufacturer in the design of the bearing. In our example where we have a Prefix of (S) it tells us that the bearing was made using stainless steel. Below are a couple of common examples

However, this code can become illegible or possibly worn away over time. So, it is important to measure a ball bearing correctly.

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We have created a list of the most popular sizes to make it quicker and easier for you to identify and purchase the exact ball bearing for your application. Simply click on your size and view our current selection.

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Place the ball bearing on a flat and clean surface. Take the caliper or micrometer and gently insert its jaws or anvils into the bore of the bearing. Ensure that the measuring tool is at a right angle to the bore. Once positioned correctly, read, and record the measurement displayed on the caliper or micrometer. This value represents the bore size or the Inner Diameter (ID) of the bearing.

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Important Note that from 20mm and above you would need to times (x) the last 2 digits by 5 to ascertain the bore size for nearly all types of bearing.

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Before measuring, it’s important to identify the type of ball bearing you have. There are several common types, such as deep groove ball bearings, angular contact ball bearings, and thrust ball bearings to mention a few. Each type has its own unique design, and it is essential to recognize the correct type you have for accurate measurements. For more information on the different types of ball bearings available please see our Ball Bearings Guide