What is the typical clearance in distance between surfaces in a rolling element bearing?

In rolling element bearings, a clearance of approximately 1 micrometer is considered typical to ensure proper functioning of the bearing. This small clearance allows for the necessary movement and thermal expansion while minimizing friction and wear. It is crucial for maintaining the accuracy and efficiency of the bearing during operation.

The clearance must be sufficiently small to prevent excessive play between the rolling elements and raceways, which could lead to operational issues such as vibrations and reduced load-carrying capacity. However, it cannot be too tight, as that may lead to overheating and premature failure due to inadequate lubrication or interference between the components.

When considering the other options, although they are measurements within a similar range, they do not reflect the most standard practice for clearance in high-performance applications. The focus is on achieving a balance that allows for effective operation of the bearing while preventing mechanical failure, which is best represented by the 1-micrometer standard.