How to find bearing numbers by size?
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For Radial ball, Roller, and plain bearings the critical dimensions are bore size, outer diameter, and width. The dimensions for bearings are expressed in metric and or imperial denominations.
Specifying a bearing by dimensions is important to have the basic information available.
What are the bore, outer diameter, and width dimensional requirements? If you have the dimensions through measurement on the bearing you can determine the size by looking in a bearing catalog. For example, you measure a standard single-row ball bearing having a 17mm bore (b) x 40 mm outer diameter (D) x width (B) 12 mm wide. Looking at the SKF catalog you will find the part number 6203-RS as the correct bearing. Options are included for the enclosure type shielded, sealed, or open giving you many choices.
