What is the maximum safe operating temperature for motor bearings?

The maximum safe operating temperature for motor bearings is commonly recognized as 200°F (95°C). This temperature is considered the upper limit for reliable operation to ensure the longevity of the bearings and prevent potential failures. Operating temperatures above this threshold can lead to accelerated wear, decreased lubrication effectiveness, and ultimately, catastrophic bearing failures.

Maintaining temperatures within this range allows for the proper functioning of the grease or oil used to lubricate the bearings, ensuring that they can reduce friction efficiently. Additionally, bearing materials may begin to degrade if subjected to prolonged exposure to temperatures exceeding this limit, which can adversely affect the performance and safety of the motor.

The other options represent temperatures that are increasingly unsafe for standard motor bearing operations, with temperatures exceeding 200°F leading to significant risks of damage and reliability concerns.