... -70~+280°C,as your requestRing MaterialRefined high carbon chrome bearing steel,Carbon Steel,Stainless Steel and Ceramic.Tolerance classGB/T307 ... ,Z2,Z3,Z4Vibration level:V1,V2,V3,V4Hardness of the bearing:HRC59-6ApplicationAutomotive,Office equipment,Electric applicance,Electronics equipment,Optical instrument ... ,Pioneering and Innovative5.Welcome to inquiry . Stainless steel deep groove ball bearing