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# If you heat a piece of steel with a hole in the center will the diameter of the steel get bigger or smaller?

###### Wiki User

###### September 12, 2011 10:02PM

It expands; example/ If you take a bearing for a ( motor shaft-not an engine, an electric MOTOR ) to install a new bearing after removing the others simple heat the new one to a moderate temperature with gloved hands slide it onto the shaft. It cools rapidly and is on the shaft as though it was pressed on.

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