Lubricated with low-vapor pressure grease for entire service life
Work in any mounting orientation
No lubricant can enter the high-vacuum chamber, even if the pump is operated upside down
Ceramic ball's low surface roughness, its hardness, and the fact that it can't micro-weld to the raceway improves the free running and longevity of the bearing
Ball's low mass reduces centrifugal force, minimizing wear
Lower expansion coefficient reduces the effects of temperature changes