ABEC precision levels, ABEC-1, ABEC-3, ABEC-5, ABEC-7, and ABEC-9 are the equivalent to ISO precision levels P0, P6, P5, P4, and P2 respectively.
Bearlng accuracy are respectlvely P0, P6 , P5 , P4 and P2 flve class , whose accuracy Increased. Multiple level rolling mill block bearing P4 Tolerance class.
Class 2. P2: ISO Class 2 (ABEC9). *P4Y indicates special ID/OD tighter tolerance for ease of matching sets. P4Y. H-1. SUPER PRECISION BEARINGS
White Paper on bearing tolerance and precision levels including definitions and specifications of ABEC and RBEC precision levels . ABEC 9, Class 2, P2
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