Technical Reference
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Tables for Determining Metric Tolerances
ITEMS IN mm IT STANDARD TOLERANCES (UNITS IN 0.001mm) OVER TO IT01 IT0 IT1 IT2 IT3 IT4 IT5 IT6 IT7 IT8 IT9 IT10 IT11 IT12 IT13 IT14 IT15 IT16 IT17 IT18 0 3 0.3 0.5 0.8 1.2 2 3 4 6 10 14 25 40 60 100 140 250 400 600 — — 3 6 0.4 0.6 1 1.5 2.5 4 5 8 12 18 30 48 75 120 180 300 480 750 — — 6 10 0.4 0.6 1 1.5 2.5 4 6 9 15 22 36 58 90 150 220 360 580 900 1500 — 10 18 0.5 0.8 1.2 2 3 5 8 11 18 27 43 70 110 180 270 430 700 1100 1800 2700 18 30 0.6 1 1.5 2.5 4 6 9 13 21 33 52 84 130 210 330 520 840 1300 2100 3300 30 50 0.6 1 1.5 2.5 4 7 11 16 25 39 62 100 160 250 390 620 1000 1600 2500 3900 50 80 0.8 1.2 2 3 5 8 13 19 30 46 74 120 190 300 460 740 1200 1900 3000 4600 80 120 1 1.5 2.5 4 6 10 15 22 35 54 87 140 220 350 540 870 1400 2200 3500 5400 120 180 1.2 2 3.5 5 8 12 18 25 40 63 100 160 250 400 630 1000 1600 2500 4000 6300 180 250 2 3 4.5 7 10 14 20 29 46 72 115 185 290 460 720 1150 1850 2900 4600 7200 250 315 2.5 4 6 8 12 16 23 32 52 81 130 210 320 520 810 1300 2100 3200 5200 8100 315 400 3 5 7 9 13 18 25 36 57 89 140 230 360 570 890 1400 2300 3600 5700 8900 400 500 4 6 8 10 15 20 27 40 63 97 155 250 400 630 970 1550 2500 4000 6300 9700 500 630 4.5 6 9 11 16 22 30 44 70 110 175 280 440 700 1100 1750 2800 4400 — — 630 800 5 7 10 13 18 25 35 50 80 125 200 320 500 800 1250 2000 3200 5000 — — 800 1000 5.5 8 11 15 21 29 40 56 90 140 230 360 560 900 1400 2300 3600 5600 — — Table 4: IT Standard Tolerances Table 4 details the ISO-basic tolerances (International Tolerance Grades, or, “IT”) which apply to all linear sizes (external and internal sizes, diameters, lengths, widths and thicknesses). An IT-grade number establishes the magnitude of the tolerance zone, while the tolerance position letter determines where the tolerance zone is in relation to the zero line. The combination of tolerance position letter (A-X, a-x) and IT-grade number (01-8) creates the overall tolerance symbol (i.e., F8/h7 when using the shaft-basis system of fits). For nominal size range up to 500mm according to DIN 7151/ISO 286, and for nominal size range over 500mm, according to DIN 7172/ISO 286.
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