Tolerance classes and the corresponding values for certain tolerance characteristics are specified in ISO 492 (for radial bearthese standards were aligned with general ISO GPS (Geometrical Product Specification) standards such as ISO 1101 and ISO 5459.
· ISO Dimensional system and bearing numbers 1.2 Formulation of bearing numbers The rolling bearing is an important mstandardization of bearing numbers has been examined by ISO but not adopted. Now, manufacturers of various countries are using
ISO 281:2007 specifies methods of calculating the basic dynamic load rating of rolling bearings within the size ranges shown irdance with good manufacturing practice and basically of conventional design as regards the shape of rolling contact surfaces.
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7310a 50 110 27 7300a 10 35 11 7328a 140 300 62 7313a 65 140 33 7332a 160 340 68 7326a 130 280 58 7315a 75 160 37 7312a 60 130 31 12
· Standardization of all types and all sizes of bearing elements based on the principle of rolling motion, includingication and standardization of spherical plain bearings, i.e. plain bearings with spherical contact surface. ISO/TC 4/SC 4
 ISO 7148 2, Plain bearings — Testing of the tribological behaviour of bearing materials — Part 2: Testing of polymer basedls.  BEGELINGER, A. and DE GEE, A.W.J., Wear in lubricated journal bearings, Transactions ASME, 100 (1), 1978, p. 104 109.
COVER STORY ISO 281:2007 bearing life standard —and
· contact bearings, or 10/3 for typical roller bearings. Ten years later, in 1962, ISO adopted this approach in the could eas ily be used by both bearing manufacturers and users, R281 was a leap forward—but only the beginning of the story. W
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