Bearingnumber identification

The type code indicates the type of bearings. Each manufacturer uses their own numbers. They could be single or double digits or alphabets.

Bearingnumbermeaningpdf

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If there is no fourth digit – for example, a 608 bearings, a common roller skate bearing – then the size is the last digit in mm. i.e. bore size bearings 608 is 8 mm

The digit before the indicating number (the third digit from end), represents the series, which reflects the robustness of the bearings. The series are, from lightest to heaviest: