... the production of bearingDeep groove ball bearing.The material is chrome steel or carbon steel.sealed type:OPEN ,Z,ZZ,RZ,8RZ,RS ... 6800 6900 1600 16000 series,etc. NameValueBrandHTZCModel6002Production Capacity150000 Piece/Pieces per MonthAutomatic GradeABEC-1,ABEC-5,ABEC-3,Bearing VibrationV1,V2 ...