What is the maximum temperature at which a bearing should be heated for expansion purposes?

The maximum temperature for heating a bearing during expansion must ensure that the bearing does not suffer any damage or degradation due to excessive heat. Heating to 120°C (250°F) is considered optimal because it allows for sufficient thermal expansion to facilitate installation without compromising the material properties of the bearing.

At this temperature threshold, the bearing's metal does expand adequately while remaining within safe limits to prevent issues such as changes in microstructure that could occur at higher temperatures. Many bearing materials, especially those that are steel-based, tend to maintain their integrity at this heating level, allowing for effective installation.

Heater or induction methods are typically used to reach this temperature as they provide controlled heating, minimizing the risk of overheating. Options that suggest heating to 100°C, 80°C, or temperatures above 120°C may lead to inefficient installation or potential damage to the bearing, thus underscoring why the choice of 120°C is preferable.