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Precision grade

Angular contact ball bearing precision grade includes dimensional tolerance and revolving tolerance.From low to high precision is expressed as P0 (ordinary), P6 (P6X), P5, P4, P2.In addition, in the European and American brands also expressed in P3, P7 and P9 precision grade, P3 level equivalent to ISO and JIS standard P6, P7 is equal to the P4 level, P9 level equal to P2.