The code number of an anti-friction bearing typically includes information about which characteristic?

• A. Material type
• B. Weight capacity
• C. Bore diameter
• D. Temperature rating

Answer: (C)

The code number of an anti-friction bearing is designed to convey specific and crucial information about its dimensions and characteristics. In this case, the bore diameter—also known as the inner diameter—is indeed included in the code number. Knowing the bore diameter is essential for ensuring that the bearing fits properly on the shaft it will mount to. This precision is fundamental to the performance and longevity of the bearing in machinery, as a correct fit minimizes wear and potential failure.

The other characteristics mentioned, such as material type, weight capacity, and temperature rating, are important for selecting the appropriate bearing for various applications, but they are not directly encoded in the bearing's code number in the same way that the bore diameter is. Understanding the bore diameter allows a technician to quickly identify the most suitable bearing for their needs without needing to refer to additional specifications.