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ISO-Fundamental Tolerance series |
Extract from Part 1 DIN ISO 286 |
Tolerances in µm
| Tol.- | Nominal sizes | ||||||||||||
| Grades | - | > 3 | > 6 | > 10 | > 18 | > 30 | > 50 | > 80 | > 120 | > 180 | > 250 | > 315 | > 400 |
| IT | ... 3 | ... 6 | ... 10 | ... 18 | ... 30 | ... 50 | ... 80 | ... 120 | ... 180 | ... 250 | ... 315 | ... 400 | ... 500 |
| 01 | 0,3 | 0,4 | 0,4 | 0,5 | 0,6 | 0,6 | 0,8 | 1 | 1,2 | 2 | 2,5 | 3 | 4 |
| 0 | 0,5 | 0,6 | 0,6 | 0,8 | 1 | 1 | 1,2 | 1,5 | 2 | 3 | 4 | 5 | 6 |
| 1 | 0,8 | 1 | 1 | 1,2 | 1,5 | 1,5 | 2 | 2,5 | 3,5 | 4,5 | 6 | 7 | 8 |
| 2 | 1,2 | 1,5 | 1,5 | 2 | 2,5 | 2,5 | 3 | 4 | 5 | 7 | 8 | 9 | 10 |
| 3 | 2 | 2,5 | 2,5 | 3 | 4 | 4 | 5 | 6 | 8 | 10 | 12 | 13 | 15 |
| 4 | 3 | 4 | 4 | 5 | 6 | 7 | 8 | 10 | 12 | 14 | 16 | 18 | 20 |
| 5 | 4 | 5 | 6 | 8 | 9 | 11 | 13 | 15 | 18 | 20 | 23 | 25 | 27 |
| 6 | 6 | 8 | 9 | 11 | 13 | 16 | 19 | 22 | 25 | 29 | 32 | 36 | 40 |
| 7 | 10 | 12 | 15 | 18 | 21 | 25 | 30 | 35 | 40 | 46 | 52 | 57 | 63 |
| 8 | 14 | 18 | 22 | 27 | 33 | 39 | 46 | 54 | 63 | 72 | 81 | 89 | 97 |
| 9 | 25 | 30 | 36 | 43 | 52 | 62 | 74 | 87 | 100 | 115 | 130 | 140 | 155 |
| 10 | 40 | 48 | 58 | 70 | 84 | 100 | 120 | 140 | 160 | 185 | 210 | 230 | 250 |
| 11 | 60 | 75 | 90 | 110 | 130 | 160 | 190 | 220 | 250 | 290 | 320 | 360 | 400 |
| 12 | 100 | 120 | 150 | 180 | 210 | 250 | 300 | 350 | 400 | 460 | 520 | 570 | 630 |
| 13 | 140 | 180 | 220 | 270 | 330 | 390 | 460 | 540 | 630 | 720 | 810 | 890 | 970 |
| 14 | 250 | 300 | 360 | 430 | 520 | 620 | 740 | 870 | 1000 | 1150 | 1300 | 1400 | 1550 |
| 15 | 400 | 480 | 580 | 700 | 840 | 1000 | 1200 | 1400 | 1600 | 1850 | 2100 | 2300 | 2500 |
| 16 | 600 | 750 | 900 | 1100 | 1300 | 1600 | 1900 | 2200 | 2500 | 2900 | 3200 | 3600 | 4000 |
| 17 | 1000 | 1200 | 1500 | 1800 | 2100 | 2500 | 3000 | 3500 | 4000 | 4600 | 5200 | 5700 | 6300 |
| 18 | 1400 | 1800 | 2200 | 2700 | 3300 | 3900 | 4600 | 5400 | 6300 | 7200 | 8100 | 8900 | 9700 |
The use of this table is limited to smooth circular cylindrical workpieces or such with two parallel fitting planes or contact areas.
The values attributed to an ISO tolerance grade (IT) specify the tolerance value and hence the tolerance area. With ascending numbers, the size of the tolerance increases.
For identification purposes of the position of the tolerance area in relation to the nominal dimension (zero), the number chosen as tolerance grade IT is preceded by a letter.
Tolerance area H is the most common value for bores. It specifies that the minimum dimension of the bore corresponds to the nominal dimension. The permissible maximum dimension corresponds to the nominal dimension plus the IT "tolerance.
| Examples: | bore 20 H7 = 20 + 0,021 / 0 min. dimension: 20,000 max. dimension: 20,021 |
bore 8 H11 = 8 + 0,090 / 0 min. dimension: 8,000 max. dimension: 8,090 |
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