... 2,High speed 3,End cover:ZZ,RS 4,Noise level:Z1,Z2 Quick Details Structure: Deep GrooveType: BallBrand Name: HCCCBore ... ...Tolerance codes: ABEC-1, ABEC-3, ABEC-5, ABEC-7Vibration level codes: V4, V3, V2, V1Internal clearance codes: C0,C2, C3 ... 2,High speed 3,End cover:ZZ,RS 4,Noise level:Z1,Z2We are a specialized manufacturer of linear motion bearing ...