ball bearings: 1.China manufacturer 2.materical:bearing steel (Gcr15),carbon steel 3.ISO9001:20008 4.OEM service 1. SpecificationsBallsChrome steel or carbon structural steelRadial Internal ClearanceC2, C0, C3Precision LevelP0, P6, P5 (ABEC-1 ABEC-3 ABEC-5)HardnessHRC60-HRC64Noise & Vibration levelZ1, Z2, Z3; & V1,V2,V3Certification & Special Service : ISO 9001:2008Payment Term : 1. 30%T/T in ...