| ITEM | sr188 |
| bore diameter(d) | 6.35mm |
| outside diameter(D) | 12.7mm |
| outside diameter of flange(Df) | |
| TYPE | ZZ OR RS |
| MATERIAL | Gcr15 or 9Cr18 |
| GREASE | at request |
| MEMO | widely used in electric toothbrush,motor or fishing reel |
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| DIMENSION | balls | ||||||
| ITEM | d | D | Width for open B | width for ZZ B1 | Radius | size | qty |
| mm | mm | mm | mm | mm | mm | PCS | |
| R1-4zz | 1.9840 | 6.3500 | 2.3800 | 3.5710 | 0.1000 | 1.000 | 7 |
| R133zz | 2.3800 | 4.7620 | 1.5880 | 2.3800 | 0.1000 | 0.800 | 7 |
| R1-5zz | 2.3800 | 7.9380 | 2.7790 | 3.5710 | 0.1500 | 1.588 | 6 |
| R144Jzzs | 3.1750 | 6.3500 | 2.3800 | 2.7790 | 0.1000 | 1.000 | 8 |
| R2-5zz | 3.1750 | 7.9380 | 2.7790 | 3.5710 | 0.1000 | 1.588 | 6 |
| R2-6zz | 3.1750 | 9.5250 | 2.7790 | 3.5710 | 0.1500 | 1.588 | 7 |
| R2zz | 3.1750 | 9.5250 | 3.9670 | 3.9670 | 0.3000 | 1.588 | 7 |
| R2Azz | 3.1750 | 12.7000 | 4.3660 | 4.3660 | 0.3000 | 1.588 | 7 |
| R155zzs | 3.9670 | 7.9380 | 2.7790 | 3.1750 | 0.1000 | 1.000 | 10 |
| R156zzs | 4.7620 | 7.9380 | 2.7790 | 3.1750 | 0.1000 | 1.000 | 10 |
| R166zzs | 4.7620 | 9.5250 | 3.1750 | 3.1750 | 0.1000 | 1.588 | 8 |
| R3zz | 4.7620 | 12.7000 | 3.9670 | 4.9780 | 0.3000 | 2.381 | 7 |
| R3Azz | 4.7620 | 15.8750 | 4.9780 | 4.9780 | 0.3000 | 2.381 | 8 |
| R168zzs | 6.3500 | 9.5250 | 3.1750 | 3.1750 | 0.1000 | 1.000 | 11 |
| R188zz | 6.3500 | 12.7000 | 3.1750 | 4.7620 | 0.1500 | 2.000 | 8 |
| R4zz | 6.3500 | 15.8750 | 4.9780 | 4.9780 | 0.3000 | 2.381 | 8 |
| R4Azz | 6.3500 | 19.0500 | 5.5580 | 7.1420 | 0.4000 | 3.500 | 6 |
| R1810zzs | 7.9380 | 12.7000 | 3.9670 | 3.9670 | 0.1500 | 1.200 | 12 |
| R6zz | 9.5250 | 22.2250 | 5.5580 | 7.1420 | 0.4000 | 3.969 | 7 |
| R1038zz | 9.5250 | 15.8750 | 3.9670 | 3.9670 | 0.1500 | ||
| R1212zz | 12.7000 | 19.0500 | 3.9670 | 3.9670 | |||
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