Because the bearings are standard components, outer ring of the bearing inner ring bore and shaft diameter tolerances at the time of manufacture have been identified, bearing and axle journal and the shell holes with the needs determined by the journal and the shell hole tolerance zone. Select mating which determine the axle journal and bearing casing hole tolerance zone type journal under the national standard GB/t 275-1993 and shell hole tolerance zone.
The tolerance zone is only available for the following occasions: ① bearing overall dimensions in accordance with GB/t 273.3-1999 bearing radial overall dimensions of the provisions of the general programmes; ② precision of the bearing phase 0 and 6 (6x) levels; c to a basic set of radial internal clearance of the bearing clearance; ④ for solid or thick-walled steel axes; ⑤ shell-cast steel or cast iron.
As the hole tolerance zone below the zero line, GB/T 1801-1999 Datum hole tolerance zone in the cylindrical tolerance standards above the zero line, so the cooperation as the base level of bearing (inner ring diameter, the outer ring outside diameter) tolerance zone, and journal or shell hole size deviation of the relative. Apparently bearing inner ring and axle base mix GB/T 1801-1999-hole tie tight with the same name. On the bearing inner ring and shaft fit, many clearance fit of cylindrical tolerance standard has in fact become a transition fit here, such as frequently used in tie, G5, G6, H5, H6, fit has become a transitional support transition fit for the purposes here has in fact become an interference fit.



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