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International Standards
| ABMA / ISO 3290 : 2001 (E) | (Values in Micron) | |||
| Grade | Variation of Ball | Deviation from | Surface | Lot dia. |
| Diameter | Sperical Form | Roughness | Variation | |
| VDWS max | tDW max | Ra max | VDWL max | |
| G3 | 0.08 | 0.08 | 0.01 | 0.13 |
| G5 | 0.13 | 0.13 | 0.014 | 0.25 |
| G10 | 0.25 | 0.25 | 0.02 | 0.5 |
| G16 | 0.4 | 0.4 | 0.025 | 0.8 |
| G20 | 0.5 | 0.5 | 0.032 | 1 |
| G24 | 0.6 | 0.6 | 0.04 | 1.2 |
| G28 | 0.7 | 0.7 | 0.05 | 1.4 |
| G40 | 1 | 1 | 0.06 | 2 |
| G60 | 1.5 | 1.5 | 0.08 | 3 |
| G100 | 2.5 | 2.5 | 0.1 | 5 |
| G200 | 5 | 5 | 0.15 | 10 |
| G500* | 12.5 | 12.5 | - | 25 |
| G1000* | 25 | 25 | - | 50 |
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