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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.

On the other hand, spherical roller bearings have an inner ring, an outer ring, and a cage with barrel-shaped rollers. These bearings are designed to accommodate both radial and axial loads, making them highly versatile. Spherical roller bearings are particularly useful in applications where the shaft has a significant misalignment or where there is a need for high thrust loads. The barrel-shaped rollers in spherical roller bearings allow them to accommodate misalignment and still maintain proper contact between the bearing surfaces, ensuring smooth operation The barrel-shaped rollers in spherical roller bearings allow them to accommodate misalignment and still maintain proper contact between the bearing surfaces, ensuring smooth operation The barrel-shaped rollers in spherical roller bearings allow them to accommodate misalignment and still maintain proper contact between the bearing surfaces, ensuring smooth operation The barrel-shaped rollers in spherical roller bearings allow them to accommodate misalignment and still maintain proper contact between the bearing surfaces, ensuring smooth operationcylindrical roller bearings or spherical roller bearing.