Deep groove ball bearing features:
1 Sealing form: Open, Z, ZZ, RS, 2RS, 2RZ
2 Bearing Snap ring: N, NR
3 Accuracy: ABEC-1, ABEC-3, ABEC-5, ABEC-7
4 Vibration level: V1, V2, V3, V4
5 Noise level: Z1, Z2, Z3, Z4
6 Internal clearance codes: C0, C2, C3, C4, C5
7 Bearing Material: Bearing steel (9Cr18), stainless steel (AISI440C, AISI304, AISI316), ceramics
8 holder: stainless steel, PTFE, nylon
9 bearing rings and balls hardness: 59 - 63HRC