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In addition to these primary dimensions, there are other factors that define the 638 bearing's performance, such as the load capacity, speed rating, and clearance638 bearing dimensions. Load capacity refers to the maximum weight the bearing can handle before damage occurs. Speed rating, on the other hand, indicates the maximum rotational speed the bearing can withstand. The clearance, or the small gap between the inner and outer rings, affects the bearing's running accuracy and temperature rise during operation.