| Diametro/mm | Tolleranza di precisione | ||
| Livella di precisione | |||
| Livello | Livello | Livello | |
| 5.5-7 | ±0.20 | ±0.30 | ±0.40 |
| > 7-12 | ±0.25 | ±0.35 | ±0.40 |
| > 20-30 | ±0.30 | ±0.40 | ±0.50 |
| > 30-50 | ±0.40 | ±0.50 | ±0.60 |
| > 50-80 | ±0.60 | ±0.70 | ±0.80 |
| > 80-110 | ±0.90 | ±1.00 | ±1.10 |
| > 110-150 | ±1.20 | ±1.30 | ±1.10 |