... . High precision , low noise, high durability, long life. 6301 2RS Roller bearingHigh precision, low noise, high durability , long life.Manufacturer of ... Ball Bearings in Cixi, Zhejiang, China.Tolerance: ABEC-1; ABEC-3; ABEC-5;Vibration: Z1V1;Z2V2; Z3V3;Certificate: RoHS, ISO9001:2008 ... , 6309, 6310;Production Ability: 5,000,000PCS/Month; 6301 2RS Roller bearing