... the Japanese and European bearings3.Tolerance level:ABEC-1(P0),ABEC-3(P6),ABEC-5(P5),ABEC- ... from 1mm to 12mm.Inch series ,inner diameter from 1.984 to 12.70, "R" bearingsNumber of rowSingle ... Steel,Stainless Steel and Ceramic.Tolerance classGB/T307.1-94:PO P6 P5 P4;C0,C2,C3, ... bearings can be calssfied as “open”,”shielded”,”sealed”.(1) Single-row deep groove ball bearingsThey can sustain radial ...