According to different requirements, the TIMKEN bearings manufacturer has to provide products of different accuracy requirements, below is some information about bearings precision class introduction
　　TIMKEN precision of the bearings are mainly divided into: dimensional accuracy and running accuracy.
　　Bearings precision scale, divided into level 0, level 6X, level 6, 5, 4, 2 levels six levels.
　　Bearings accuracy from level 0 to level up in turn to improve the General level 0 is sufficient, but for other conditions or when the occasion requires level 5 or more precision.
　　Precision grade above are based on ISO standards developed, but its call in national standards vary
　　TIMKEN bearings dimensional accuracy (installed with shaft and housing-related projects)
　　1, inner diameter, outer diameter, width and assembled width allowable deviation
　　2, within the compound of the roller set circle diameters and compound outside diameter tolerances
　　3, allowed limits for chamfer dimensions
　　Change amount of width 4, allowing
　　Rotation accuracy of TIMKEN bearings (with rotating body beat-related projects)
　　1, allows inner ring and outer ring radial and axial runout
　　2, inner ring allows lateral runout
　　3, outside diameter surface inclination change amount of allowed
　　4, the amount of thrust bearings Raceway allows changes in thickness
　　5, tapered bore tolerances and allows variation
　　In most cases applying general dimensional accuracy and running accuracy of bearings (PN of the tolerance grade) is sufficient. When you demand higher, TIMKEN bearings need higher precision level, examples such as machine tool spindle bearings. In order to achieve a higher precision requirements, standards for the P6, P6X, P5, P2 and P4 tolerance class. P4S in accordance with company standards for special bearings, SP and UP the tolerance level.
　　Does not appear neutral in the process when the shaft surface of the neck tie or housing mating surfaces, particularly in conjunction with surface processing is not completed in one card. When you use the housings also have a misalignment, such as flange housings or Plummer. Axis bending deformation occurs due to work load, from when the bearings inner and outer rings tilt and, will also appear in the wrong.
　　Spherical bearings can be right and tilt compensation, for instance Peng peiyun, self-aligning ball bearings, roller bearings, radial and thrust roller bearings. Such TIMKEN roller bearings have a concave spherical outer ring road, rolling element and the inner ring can rotate inside. These compensating deflection angle of shaft centerline of bearings capacity depends on the type, size, and load their own situation.
　　Spherical bearings and washers of thrust ball bearings have a spherical bearings surface; when installed on the concave spherical seat deflection angle of compensation can be adjusted.


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