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Ranges of the International Organisation for Standardisation (ISO) basic sizes and corresponding tolerance factor i.
| Range | Basic Size | |||||||
|---|---|---|---|---|---|---|---|---|
| Above D1 (mm) | 1 | 3 | 6 | 10 | 18 | 30 | 50 | 80 |
| Up to including D2 (mm) | 3 | 6 | 10 | 18 | 30 | 50 | 80 | 120 |
| Standard tolerance factor i (µm) | 0.542 | 0.733 | 0.898 | 1.083 | 1.307 | 1.561 | 1.856 | 2.173 |
