Bore diameter

The bore or bore diameter is the inner diameter of the inner ring.

The abbreviation in catalogs or techn. drawings is "d"

If you know the required bore diameter, you can derive part of the rolling bearing abbreviation, the bore code. Up to 480 mm bore diameter, the last two digits of the basic rolling bearing designation are the bore code.

For a bore diameter of 10 mm the bore code is 00; for 12 mm 01; for 15 mm 02 and for 17 mm bore diameter 03; In the range from 20 mm to 480 mm the bore code is calculated by dividing the bore diameter by 5. As long as the result is in single digits, a 0 is placed in front. e.g. 20 mm/ 5 = bore index 04 or 45 mm / 5 = bore index 09; From 500 mm, the bore diameter is shown in the short designation with the actual value. e.g. 750 mm is shown with a /750 for a spherical roller bearing e.g. 230/750 EW33C4

Conversely, if you have the designation of a bearing, you can derive the bore diameter in reverse order. e.g. 6222-The last two digits of this basic designation =bore code 22x5 = 110 mm bore diameter or inner diameter.

To select a rolling bearing from a catalog according to the main dimensions, you need the inner diameter = bore diameter, outer diameter and width of the bearing. If you would like to select the right rolling bearing for your application, we will be happy to help you. To do this, we also need to know the application, the radial and axial loads, the required speed and the operating temperature.

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