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ISO Tolerances

ISO Tolerance Band "T "..0 to 315mm

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

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Last Updated 17/07/2007