... 4,Noise level:Z1,Z2 double row cylindrical roller bearing 1,ABEC-3,5;Z2V2,Z3V3 2,High ... Noise level:Z1,Z2 double row cylindrical roller bearing is in line contact with the raceway, so ... multiple rows among which the single row cylindrical roller bearings are most applicable. Normally these bearings can ... Groove &3 Holes in Outer Ring Structure Cylindrical roller bearings N series,NU series,NF series,NUP ...