Which of the following statements about bearing heating is true?

Heating bearings for mounting purposes is a common practice used to facilitate the installation of bearings onto shafts or into housings. When a bearing is heated, it expands slightly, allowing it to go onto the shaft or into the housing more easily. This method is particularly beneficial for tight fits, as it helps prevent damage to the bearing and ensures proper alignment.

When a non-sealed bearing is heated, care should be taken to ensure that the heating is uniform and done to the appropriate temperature. This helps maintain the integrity of the bearing's materials and avoids introducing contaminants, which can compromise performance. Heating is typically done using specialized heating equipment, such as induction heaters, which provide controlled and efficient heating rather than using methods that can cause overheating or uneven expansion.

The other statements do not accurately represent best practices regarding bearings. For example, the claim that bearings should never be heated is incorrect, as heating is a standard technique when done properly. Additionally, the notion that heating bearings is not recommended conflicts with the accepted practices in equipment maintenance when mounting bearings.