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Design considerations

Shaft and housing fits

Shaft and housing fits can also have a significant influence on the internal clearance and the operating characteristics of polymer deep groove ball bearings. SKF recommends the following:
  • Have approximately 20 μm interference fit for one ring only.
  • Depending on the application, the interference fit can be on the shaft or in the housing. The ring with a rotating load should typically have an interference fit, and the one with a stationary load, a loose fit.
  • Never subject both bearing rings to an interference fit as it preloads the bearing, causing it to fail prematurely.
These recommendations are only guidelines to calculate a fit. Thermal expansion of both the bearing components and the shaft and housing under operating conditions must be taken into consideration.
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