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Why are the dimensions of CSB plastic plain bearings larger than in the catalog?
Release Date:2015-06-20    Total Hits:1344bout

CSB plastic plain bearings are designed to have an interference fit with their mounting holes.As a result, when the sleeves are in a free condition, the measured inner diameters will be larger than the standard inner diameter values in our catalog. This is because, as soon as the sleeves are pressed into standard H7 mounting holes, their inner diameters will also shrink. As a consequence, the inner diameters of plastic plain bearings are measured after the sleeves have been installed.If plastic plain bearings are measured before installation, their outer and inner diameters will consequently be larger than after they have been installed; this is why plastic plain bearings will not work loose when in operation.The following are some of the most likely causes if any installation dimension and tolerance discrepancies and problem still occur:

The mounting holes do not have an appropriate chamfer or are excessively smooth - External scratches on plastic plain bearings may reduce their wall thickness and cause the inner diameter to become larger after installation;

Mounting holes do not have standard H7 tolerance - The inner diameter will vary with the change in the mounting hole diameter;

 Mounting holes are made from soft material - Expansion of the sleeves after installation enlarges the inner diameter;


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