... quick delivery 4.good service Kinds of Japan NSK/NTN/KOYO/NACHI bearings6000ZZ series of deep groove ball bearings, Japan ... radial load as well as moderate axial load. With less coefficient of friction, less vibration and noise, less energy consumption, high ... limiting speed, large size range and variations of structure.Detailed Description1) Model Open, Z, ZZ, RZ, 2RZ ...