... (The biggest bearing cages factory in China) 2. Main types : deep groove ball bearing , self-aligning ball bearings, cylindrical roller bearings ... bearing , thrust ball bearing , thrust roller bearing 3. Bearing name :Deep groove ball bearing4. Number of row :Single row or double ... , Z, ZZ, RZ, RS,2RS 7.High precision, low noise 8. Material: Gcr15, Gcr15Simn, G20Cr2Ni4A, Gr18Mo 9. Outside diameter: 3- ...