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

Explanation:

　　Z represents that one-side of the deep groove ball bearing is mental dust cover, and ZZ represents that both sides are mental dust cover.

　　RS represents that one-side of the deep groove ball bearing is non-touch grommet, and 2RS represents that both sides are non-touch grommet.

　　RZ represents that one-side of the deep groove ball bearing is contact grommet, and 2RS represents that both sides are contact grommet.