A bearing number is made up of a basic number and a supplementary code, signifying bearing specs including bearing type, limit dimensions, running precision, and internal clearance.
Bearing varieties of standard bearings corresponding to JIS B 1512 “rolling bearing limit measurements” are prescribed in JIS B 1513.
As well as these bearing numbers, JTEKT uses supplemental codes besides those supplied by JIS.
Amongst basic numbers, bearing series codes are listed in Table 6-1 Bearing series code, and the composition of bearing numbers is explained in Table 6-2 Bearing number configuration, showing the order of plan of the parts.
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Ball Bearing Sizes and Dimensions
Ball bearings are readily available in all different sizes, depending upon the shaft size and requirements of the application. As they are utilized in all types of markets, they are needed for a large range of application sizes, from skateboard wheels to oil drills. How are these bearing sizes determined?
How Bearings Are Sized
Bearings are determined by their inner size, external diameter, and width; the size of a bearing is usually noted as such: ID x OD x W. These measurements are generally taken in millimeters, but can be converted to inches. In fact, many makers and suppliers use bearing measurements in both royal and metric systems.
Each combination of these measurements corresponds to a series number, usually situated directly on the bearing. Ball bearing size charts are extensively available and can be utilized to find the measurements of a particular bearing. Series 6200 and 6300 are the most frequently used, and normally range from 10 x 30 x 9 mm (.394 x 1.181 x. 354 in) to 150 x 320 x 65 mm (5.906 x 12.598 x 2.559 in).