tolerance band in micrometres = (m-6)
based on ISO 286 IT Grades 1 to 14
| Nominal Sizes (mm) | |||||||||||
| over | 1 | 3 | 6 | 10 | 18 | 30 | 50 | 80 | 120 | 180 | 250 |
| inc. | 3 | 6 | 10 | 18 | 30 | 50 | 80 | 120 | 180 | 250 | 315 |
| IT Grade | |||||||||||
| 1 | 0.8 | 1 | 1 | 1.2 | 1.5 | 1.5 | 2 | 2.5 | 3.5 | 4.5 | 6 |
| 2 | 1.2 | 1.5 | 1.5 | 2 | 2.5 | 2.5 | 3 | 4 | 5 | 7 | 8 |
| 3 | 2 | 2.5 | 2.5 | 3 | 4 | 4 | 5 | 6 | 8 | 10 | 12 |
| 4 | 3 | 4 | 4 | 5 | 6 | 7 | 8 | 10 | 12 | 14 | 16 |
| 5 | 4 | 5 | 6 | 8 | 9 | 11 | 13 | 15 | 18 | 20 | 23 |
| 6 | 6 | 8 | 9 | 11 | 13 | 16 | 19 | 22 | 25 | 29 | 32 |
| 7 | 10 | 12 | 15 | 18 | 21 | 25 | 30 | 35 | 40 | 46 | 52 |
| 8 | 14 | 18 | 22 | 27 | 33 | 39 | 46 | 54 | 63 | 72 | 81 |
| 9 | 25 | 30 | 36 | 43 | 52 | 62 | 74 | 87 | 100 | 115 | 130 |
| 10 | 40 | 48 | 58 | 70 | 84 | 100 | 120 | 140 | 160 | 185 | 210 |
| 11 | 60 | 75 | 90 | 110 | 130 | 160 | 190 | 220 | 250 | 290 | 320 |
| 12 | 100 | 120 | 150 | 180 | 210 | 250 | 300 | 350 | 400 | 460 | 520 |
| 13 | 140 | 180 | 220 | 270 | 330 | 390 | 460 | 540 | 630 | 720 | 810 |
| 14 | 250 | 300 | 360 | 430 | 520 | 620 | 740 | 870 | 1000 | 1150 | 1300 |