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The tables list: The upper and lower limits of bore or outside diameter deviations for bearings with Normal tolerances. The upper and lower limits of shaft or housing bore diameter deviations for relevant tolerance classes in accordance with ISO 2862.
- Selecting Fits
Distortion of the bearing rings caused by shaft or housing...
- Selecting Fits
The tables as below contain recommendations for the selection of shaft and housing tolerances that are valid for normal fitting and operating conditions. Tolerance specification deviations are possible if particular requirements apply, for example in relation to running accuracy, smooth running or operating temperature.
The most commonly used tolerancing system for shafts and holes is detailed in ISO 286-1 & 286-2. The first provides the charts for the fundamental deviations (G, j, etc.) and tolerance grades (7, 8, 9, etc.), out of which the limits of the tolerance classes (H7, g6, etc.) can be calculated.
Bearing fit is governed by the selection tolerances for bearing shaft diameters and housing bore diameters. The following tables provide recommendations for tolerances of shaft and housing seats. They are valid for standard applications but do not cover all details of a specific application.
Fits and tolerance calculator for shaft and hole tolerance calculation according to ISO 286-1 and ANSI B4.2 metric standards . The schematic representation of the fit is also drawn by tolerance calculator.
For dimensional accuracy these standards prescibe tolerances and allowable error limitations for those boundry dimensions (bore diameter, outside diameter, width, assembled bearing width, chamfer, and taper) necessary when installing bearings on shafts or in housings.
Widely used fits for various shaft and housing bore diameter tolerances, and bearing bore and outside diameters are shown in Fig. 7.1. Generally-used, recommended fits relating to the primary factors of bearing shape, dimensions, and load conditions are listed in Tables 7.2 through 7.5.
