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Bearingnumber identification pdf

To learn more about the bearing clearance and its values, read our article Bearing clearance: everything you need to know.

When it comes to suffixes and prefixes, things vary much more. Prefixes are used for defining the components of a bearing or variations. Suffixes are used to indicate design particularities such as the bearing internal design or external design (seals, snap ring groove), cage design, materials and heat treatment, the tolerance, clearance, preload and so on. Below you can find common suffixes and prefixes used in roller bearing designations.

Bearingnumber meaning pdf

In our Guide to bearings, we’ve detailed the various types of bearings used in industrial applications and their structural and functional differences. In this article we’ll focus only on rolling-element bearings (ball bearings and roller bearings). If you’re not yet familiar with this type of bearing, go ahead and read our beginner’s guide first. Now let’s see how to read the roller bearing designations for some of the most popular brands on the market! Typically, a roller bearing’s designation includes a basic number (designation), surrounded by supplementary codes - suffixes and prefixes. The suffixes and prefixes describe the tolerance, internal clearance and other design particularities.

The boundary dimensions that are internationally standardized include the width and the outer diameter (B, C). Together, these are also referred to as the dimensional series of the bearing. The dimensional series (BC) along with the bearing type (A), so the first three digits of the number, form the bearing series symbol (A BC). The bore diameter is given as a 2-digit code (DE), which needs to be multiplied by 5 to give the actual bore diameter in mm. However, this rule only applies to bore diameter dimensions greater than 20 mm. Under this value, the bore diameter uses the following code identifications:

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Bearingnumber and size chart pdf

Bearingnumber List

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When suffixes and prefixes are added, the bearing designation will look like this: Prefix A BC DE Suffix The suffix can be separated from the rest of the designation number by a space, a hyphen or an oblique stroke. The codes for bearing types are as follows:

Improper handling or incorrect mounting and dismounting can damage the elements of a bearing, causing excessive noise and vibration levels. Learn how to properly mount bearings in this article.

With bearings being used across such a wide range of industries and applications, you would expect their design to be fully standardized and to have to comply to very strict international regulations. However, only a part of a bearing’s designation is currently regulated by standards issued by international bodies like ISO or ANSI. This leaves manufacturers plenty of space for innovation and for coming up with designs that are specifically engineered to help distinguish themselves from other producers, while facilitating international bearing interchangeability and economical bearing production. For consumers though, the lack of stricter standards means a multitude of unique part numbers that are specific to each manufacturer. These series are engraved or stamped on the products and can be easily retrieved when replacing a bearing. Still, if you plan to switch to a different brand or product, you need to know what the bearing designations mean in order to find suitable alternatives. So how do you navigate the seemingly chaotic bearing designation systems?

The purpose of this guide is to help you get familiar with the most common types of bearings, their design particularities and operating mode, the way they handle forces, the proper installation and maintenance procedures, as well as the most frequent problems that can cause the damage of bearings inside a machine.