SKF bearings are named:

A complete bearing code is composed of one or more of the basic code plus supplementary code. Used to denote the basic design of the type of bearing, bearing, bearing dimensions of the basic code: Supplementary Code: bearing parts, and basic design have different structures or other properties of the variants.

SKF bearing basic code:

Of SKF standard bearings has a specific model, usually three, four or five figures, or the composition of letters and numbers. The first number or a letter or letter combinations indicates that the bearing type; behind the two figures to determine the size of ISO series; first number represents the width or height series (diameter of the size of B, T ORH), the second digit represents series (size D). The last two digits of the basic model of the bearing size code; multiplied by 5 will be able to come to the inner diameter in millimeters. But there are some exceptions as follows:

In some cases, said the number of bearing types and said first number of the size series have been omitted. Example: 6 (0) 208-2Z (0) 3209 A,

For the inner diameter of less than or equal to 10 mm or greater than or equal to 500 mm bearing inside diameter is usually expressed in millimeters, not code. The rest of the size and bearing type separated by a slash, for example: 618/8 (d = 8 mm) or 

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