In a four-digit bearing code number, what does the second digit indicate?

The second digit in a four-digit bearing code number specifically indicates the service weight. This classification helps in identifying how much load the bearing can handle under specific service conditions. The code system is standardized, providing clear guidelines on what each digit represents.

In the context of bearing specifications, knowing the service weight is crucial for ensuring that the chosen bearing will operate effectively under the expected load conditions. This is essential for equipment reliability and longevity, as using a bearing not rated for the expected service weight could lead to premature failure or operational issues.

Understanding the significance of this digit, along with the other digits in the code, allows for better selection and application of bearings in various machinery, ensuring optimal performance and safety.