Rotor Bearing/Rotor Bearing Assemblies for Rotor Spinning Frame: 1. Rotor designed with a two-row deep-groove ball have advantages of high carrying capacity and steady running. 2. The multi-labyrinth ring sealing construction guarantees the bearing a good sealing effect. 3. Grease can be added, which results in long service life, lower cost and easy maintaining. 4. The parts for asselblies are strictly matched, the revolving parts are precisely dynamical balanced. 5. The maximum speed is 120000rpm. 6. Different rotor can be provided to the different damands of users.