Characteristic of deep groove ball bearing:
1. Seal form: open style, Z, ZZ, RS, 2RS, 2RZ
2. Bearing stop ring: N，NR
3. Class of precision: ABEC-1, ABEC-3, ABEC-5, ABEC-7
4. Vibration rank: V1, V2, V3, V4
5. Noise rank: Z1,Z2,Z3,Z465.
6. Internal elimination code: C0, C2, C3, C4, C5
7. Bearing material: bearing steel (9Cr18), stainless steel(AISI440C, AISI304, AISI316), ceramics
8. Keeper: stainless steel, PTFE, nylon
9. Bearing ferrule and ball hardness: 59 - 63HRC