... biggest bearing cages factory in China) 2. Main types : deep groove ball bearing , self-aligning ball bearings, cylindrical roller bearings, ... thrust ball bearing , thrust roller bearing 3. Bearing name :Deep groove ball bearing4. Number of row :Single row or double row5 ... . Material : Chrome steel ,stainless steel ,bearing steel6.Seal type: open, Z, ZZ, RZ, RS,2RS 7.High precision, ...