What is the maximum temperature to heat a bearing?

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Multiple Choice

What is the maximum temperature to heat a bearing?

Explanation:
Heating a bearing is done to expand the bore for an easier fit, but you must keep the temperature below a limit that would harm the bearing. The safe upper limit is about 120°C (250°F). At this temperature you get enough expansion to mount the bearing without risking tempering the steel or breaking down the lubricant. Going higher, like 125°C, can soften the bearing races and reduce hardness, and it can also degrade the lubricant or seals, shortening bearing life. Temperatures well below this limit may not provide enough expansion for a proper fit, so 120°C / 250°F hits the right balance.

Heating a bearing is done to expand the bore for an easier fit, but you must keep the temperature below a limit that would harm the bearing. The safe upper limit is about 120°C (250°F). At this temperature you get enough expansion to mount the bearing without risking tempering the steel or breaking down the lubricant. Going higher, like 125°C, can soften the bearing races and reduce hardness, and it can also degrade the lubricant or seals, shortening bearing life. Temperatures well below this limit may not provide enough expansion for a proper fit, so 120°C / 250°F hits the right balance.

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