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23GENERAL DRILLING HANDBOOKFor example:For size range between 6 mm and 10 mm according to IT10 grade the width of the tolerance will be 0.058 mm.For size ranges between 6 mm and 10 mm according to IT12 grade, the width of the tolerance will be 0.15 mm.For size ranges between 10 mm and 18 mm according to IT10 grade, the width of the tolerance will be 0.07 mm.For size ranges between 10 mm and 18 mm according to IT12 grade, the width of the tolerance will be 0.18 mm.IT Grade Table (ISO 286 Standard)Basic Size mm Standard Tolerance GradesAboveup to andIncludingIT1IT2IT3IT4IT5IT6IT7IT8IT9IT10T11T12T13IT14IT15IT16IT17IT18Tolerances %u03bcm mm3(3) 0.8 1.2 2 3 4 4 10 14 25 40 60 0.1 0.14 0.25 0.4 0.6 1 1.43 6 1 1.5 2.5 4 5 5 12 18 30 48 75 0.12 0.18 0.3 0.48 0.75 1.2 1.86 10 1 1.5 2.5 4 6 6 15 22 36 58 90 0.15 0.22 0.36 0.58 0.9 1.5 2.210 18 1.2 2 3 5 8 8 18 27 43 70 110 0.18 0.27 0.43 0.7 1.1 1.8 2.718 30 1.5 2.5 4 6 9 9 21 33 52 84 130 0.21 0.33 0.52 0.84 1.3 2.1 3.330 50 1.5 2.5 4 7 11 11 25 39 62 100 160 0.25 0.39 0.62 1 1.6 2.5 3.950 80 2 3 5 8 13 13 30 46 74 120 190 0.3 0.46 0.74 1.2 1.9 3 4.680 120 2.5 4 6 10 15 15 35 54 87 140 220 0.35 0.54 0.87 1.4 2.2 3.5 5.4120 180 3.5 5 8 12 18 18 40 63 100 160 250 0.4 0.63 1 1.6 2.5 4 6.3180 250 4.5 7 10 14 20 20 46 72 115 185 290 0.46 0.72 1.15 1.85 2.9 4.6 7.2250 315 6 8 12 16 23 23 52 81 130 210 320 0.52 0.81 1.3 2.1 3.2 5.2 8.1315 400 7 9 13 18 25 25 57 89 140 230 360 0.57 0.89 1.4 2.3 3.6 5.7 8.9400 500 8 10 15 20 27 27 63 97 155 250 400 0.63 0.97 1.55 2.5 4 6.3 9.7500 630(2) 9 11 16 22 32 32 70 110 175 280 440 0.7 1.1 1.75 2.8 4.4 7 11630 800(2) 10 13 18 25 36 36 80 125 200 320 500 0.8 1.25 2 3.2 5 8 12.5800 1000(2) 11 15 21 28 40 40 90 140 230 360 560 0.9 1.4 2.3 3.6 5.6 9 141000 1250(2) 13 18 24 33 47 47 105 165 260 420 660 1.05 1.65 2.6 4.2 6.6 10.5 16.51250 1600(2) 15 21 29 39 55 55 125 195 310 500 780 1.25 1.95 3.1 5 7.8 12.5 19.51600 2000(2) 18 25 35 46 65 65 150 23 370 600 920 1.5 2.3 3.7 6 9.2 15 232000 2500(2) 22 30 41 55 78 78 175 280 440 700 1100 1.75 2.8 4.4 7 11 17.5 282500 3150(2) 26 36 50 68 96 96 210 330 540 860 1350 2.1 3.3 5.4 8.6 13.5 21 33
