self -aliging ball bearings 1,high quality 2, long life and low price 3, prompt delivery Self-aliging ball bearingsSeal form: open style, Z, ZZ, RS, 2RS, 2RZ. Bearing stop ring: N,NR. Class of precision: ABEC-1, ABEC-3, ABEC-5, ABEC-7. Vibration rank: V1, V2, V3, V4. Noise rank: Z1,Z2,Z3,Z465.. Internal elimination code: C0, C2, C3, C4, C5. Bearing material: bearing steel (9Cr18), stainless steel ...