Bearing type and the meaning of the letters
In the previous article, we introduced the basic code of bearings
The bore number indicates the bore diameter. See Table 2.
Table 2. Example of Bearing Numbers and Codes
If the bearing code only contains the basic code and doesn’t include any prefixes or suffixes, it means that it is a normal bearing with normal standards of form, precision, and clearance.
Prefixes
Prefixes refer to basic bearing components. Common prefixes are shown in Table 3.
Table 3. Common Prefixes.
Suffixes
Suffixes indicate bearings with special characteristics or designs, including special outer forms, cages, precision tolerances, clearances, and other characteristics like heat treatment and noise behavior. The most common suffixes are described in the tables below.
Table 4. Suffizes for internal design
Table 5. Suffixes for outer surface dimensions
Table 6. Suffixes for Sealings
Table 7. Suffixes for cage materials
Table 8. Suffixes for precision tolerances
Table 9. Suffixes for bearing clearances
For bearings with both special precision tolerance and special clearance, the suffixes are combined. For example, the suffix for a bearing with tolerance P6 and clearance C3 is P63.
Table 10. Suffixes for dimensionally stabilized bearings
