rs.FAQDo bearings provide a sufficient pressure seal?Designers of vacuum applications often ask us this, and the answer is most definitely NO. A separate sealing device will have to be used to maintain any pressure differences.KEGAN bearing tolerance range?CLN/normal = ABEC1 ?P6 = ABEC3 ?P5 = ABEC5How can I keep contamination out in a high-speed application?By use of a labyrinth seal. The labyrinth seal is a non-contact seal with the particular internal construction which centrifuges dirt back