Rolling bearings are designated by codes that indicate the construction, dimensions, tolerances, clearances, and load factor of each bearing. A bearing's internal clearance indicates the intentional amount of deviation that's acceptable in a fit between dual mating dimensions, whereas its tolerance is the maximum unintentional deviation that the bearing can have compared to the nominal value. The allowance and tolerance make up the minimum and maximum interference or clearance for the bearing.

Bearingnumber List

Looking through a bearing catalog for the first time can be confusing or even a little intimidating. The numbering system is universal, and the majority of manufacturers use the same numbers for the same product. This allows for access to competitive products globally. The catalog can seem to be written in a secret code, with a series of letters and numbers that are unknown to anyone who hasn't chosen a bearing before. This blog post will help you crack the code and understand how to get the most from your bearings.

A bearing's basic code is made up of its bearing series and bore number, which signify the bearing's type and bore diameter, respectively. The bearing series may consist of letters, numbers, or both to specify its diameter series, construction, and often its width series, as well. To review the bearing series for commonly used bearing varieties, see Table 1 below.

Bearingnumber and size chart pdf

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Bearingnumber meaning

ISO 199, a universal standard, defines the tolerance classes, as well as any tolerance characteristic values, for thrust bearing varieties. The same is true of ISO 492, but for radial bearings. As of 2014, these standards now align with general ISO Geometrical Product Specification (GPS) standards, with examples including ISO 5459 and 1101.

If a bearing number consists solely of the basic code but not any prefixes or suffixes, this indicates that the bearing is normal and falls within the typical standards for clearance, precision, and form.

Bearingnumber list pdf

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The suffixes that designate a bearing's shield or seal type often vary by manufacturer. However, examples of common suffixes include the following:

Our Technical Toolbox is a library of compiled Emerson Bearing resources, with guides, charts, vendor catalogs, and more covering an array of bearing topics. We also encourage you to download a free copy of our eBook "Nomenclature Guide to Common Bearing Types." In our Bearing Product Catalog, you can review the various types of bearings and bearing accessories we have available.

Bearing numbers combine the suffixes for bearings that have special precision tolerances and clearances. For instance, a bearing with a P6 tolerance and C3 clearance would be written as P63. Common suffixes for internal clearance indicate the following: