Ball Bearing Mount/Housing Hardness
Ball Bearing Mount/Housing Hardness
(OP)
Hello All;
I have a question concerning the hardness requirements for a ball bearing housing or shaft mount. Is there a minimum hardness for the shaft or housing to make sure that when a bearing is installed it receives the right amount of crush? Does the hardness matter?
I have a question concerning the hardness requirements for a ball bearing housing or shaft mount. Is there a minimum hardness for the shaft or housing to make sure that when a bearing is installed it receives the right amount of crush? Does the hardness matter?





RE: Ball Bearing Mount/Housing Hardness
The place where hardness really matters is in the interface between the rolling elements and the raceway. Bearing elements and raceways tend to be extremely hard, with induced compressive stresses to help close any cracks that may form in the surface.
RE: Ball Bearing Mount/Housing Hardness
Rc = 58 minimum (for a surface the roller element is going to run on- think needle)
Rc = material if a slip fit
Increase hardness for a heavy press fit and lower for lesser press fits.
Roughness of .8a to 1.6a for less than 40mm id bearings and 1.6a to 3.2a for 40 mm id and above.
RE: Ball Bearing Mount/Housing Hardness
All correct, but they don't affect the amount of crush. The class of fit is determined by the ratio of the applied load to the bearing basic load rating. Section 3.2.2 of Harris' Essential Concepts in Bearing Technology gives further details.