Rating Table
| Grade | Diameter tolerance range | Roundness tolerance range | ||
| | Metric(mm) | British System | Metric(mm) | British System |
| G0 | +0.0127 | +0.0005 | 0.00635 | 0.00025 |
| GI | +0.0254 | +0.0010 | 0.0127 | 0.0005 |
| GII | +0.0508 | +0.0020 | 0.0254 | 0.0010 |
| GIII | +0.127 | +0.0050 | 0.1270 | 0.0050 |
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