... Stainless steel:AISI440C, AISI304, AISI316 3.ABEC-1 ABEC-3 ABEC-5,ABEC-7 4Noise level:Z1,Z2,Z3, ... and European bearings3.Tolerance level:ABEC-1(P0),ABEC-3(P6),ABEC-5(P5),ABEC-7(P4)4.Noise ... ,C3,C4,C5AFBMA STD.20-1987:ABEC-1 ABEC-3 ABEC-5 ABEC-7Noise level:Z1,Z2,Z3,Z4Vibration ... bearings can be calssfied as “open”,”shielded”,”sealed”.(1) Single-row deep groove ball bearingsThey can sustain radial ...