Bearing Designation Systems
A bearing designation is more than a model number. The basic designation tells you the bearing type, dimension series and bore size; prefixes and suffixes describe seals, shields, cages, internal clearance, accuracy, grease and special designs. Each manufacturer publishes its own designation system — this section puts them side by side, one bearing type at a time.
By Bearing Type
The Universal Structure
Across manufacturers, a designation follows the same skeleton:
Prefix + Basic designation (series + bore code) + Suffixes (seals · cage · clearance · accuracy · grease)
The bore code works the same everywhere: 00 = 10 mm, 01 = 12 mm, 02 = 15 mm, 03 = 17 mm, and from 04 up the bore in millimetres is the code times five. What differs between brands is the wording of the suffixes — that is what the per-type pages compare.
Disclaimer: Data on this page is compiled from publicly available online sources for reference only, and not every model appears in a manufacturer's published catalog. Values may differ between sources and editions — always verify against the manufacturer's current documentation before design or purchase.Full disclaimer →