Classification of bearings

4-2-215

An arbitrary system for the grouping of bearings according to their accuracy. The bearings are grouped into one or other of the four following classes

Class A bearings in which there is a probability of less than 1 in 20 that the bearing error would exceed +/-2 degrees

Class B bearings in which there is a probability of less than 1 in 20 that the bearing error would exceed +/-5 degrees

Class C bearings in which there is a probability of less than 1 in 20 that the bearing error would exceed +/-10 degrees

Class D bearings in which the error would exceed +/-10 degrees

Reference: I.T.U.

Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

English