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ISO 286 data
Tolerance Tables
Browse ISO size steps, IT grade values, and the supported fundamental deviation symbols used by the calculator engine.
IT Grade Matrix
Tolerance widths in microns (µm) for each ISO size range and IT grade
| Size range | IT5 | IT6 | IT7 | IT8 | IT9 | IT10 | IT11 | IT12 | IT13 | IT14 | IT15 | IT16 | IT17 | IT18 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Over 0 to 3 mm | 3.8 | 5.4 | 8.7 | 13.6 | 21.7 | 34.7 | 54.2 | 86.7 | 135.5 | 216.9 | 347.0 | 542.2 | 867.4 | 1355.4 |
| Over 3 to 6 mm | 5.1 | 7.3 | 11.7 | 18.3 | 29.3 | 46.9 | 73.3 | 117.2 | 183.2 | 293.1 | 468.9 | 732.7 | 1172.4 | 1831.8 |
| Over 6 to 10 mm | 6.3 | 9.0 | 14.4 | 22.5 | 35.9 | 57.5 | 89.8 | 143.7 | 224.5 | 359.2 | 574.8 | 898.1 | 1437.0 | 2245.3 |
| Over 10 to 18 mm | 7.6 | 10.8 | 17.3 | 27.1 | 43.3 | 69.3 | 108.3 | 173.2 | 270.7 | 433.1 | 692.9 | 1082.7 | 1732.3 | 2706.7 |
| Over 18 to 30 mm | 9.2 | 13.1 | 20.9 | 32.7 | 52.3 | 83.7 | 130.7 | 209.2 | 326.8 | 523.0 | 836.7 | 1307.4 | 2091.8 | 3268.4 |
| Over 30 to 50 mm | 10.9 | 15.6 | 25.0 | 39.0 | 62.4 | 99.9 | 156.1 | 249.8 | 390.3 | 624.5 | 999.2 | 1561.2 | 2498.0 | 3903.1 |
| Over 50 to 80 mm | 13.0 | 18.6 | 29.7 | 46.4 | 74.2 | 118.8 | 185.6 | 297.0 | 464.0 | 742.5 | 1187.9 | 1856.1 | 2969.8 | 4640.4 |
| Over 80 to 120 mm | 15.2 | 21.7 | 34.8 | 54.3 | 86.9 | 139.0 | 217.3 | 347.6 | 543.1 | 869.0 | 1390.4 | 2172.5 | 3476.1 | 5431.3 |
| Over 120 to 180 mm | 17.7 | 25.2 | 40.3 | 63.0 | 100.9 | 161.4 | 252.2 | 403.5 | 630.4 | 1008.7 | 1613.9 | 2521.7 | 4034.8 | 6304.3 |
| Over 180 to 250 mm | 20.3 | 29.0 | 46.3 | 72.4 | 115.8 | 185.3 | 289.6 | 463.3 | 724.0 | 1158.4 | 1853.4 | 2895.9 | 4633.5 | 7239.8 |
| Over 250 to 315 mm | 22.6 | 32.3 | 51.6 | 80.7 | 129.1 | 206.5 | 322.7 | 516.3 | 806.7 | 1290.7 | 2065.1 | 3226.8 | 5162.8 | 8066.9 |
| Over 315 to 400 mm | 24.8 | 35.4 | 56.7 | 88.5 | 141.6 | 226.6 | 354.1 | 566.6 | 885.3 | 1416.5 | 2266.4 | 3541.2 | 5665.9 | 8852.9 |
| Over 400 to 500 mm | 27.2 | 38.9 | 62.2 | 97.2 | 155.5 | 248.9 | 388.8 | 622.2 | 972.1 | 1555.4 | 2488.6 | 3888.5 | 6221.6 | 9721.2 |
| Over 500 to 630 mm | 30.4 | 43.4 | 69.5 | 108.6 | 173.8 | 278.1 | 434.5 | 695.2 | 1086.2 | 1738.0 | 2780.8 | 4345.0 | 6952.0 | 10862.5 |
| Over 630 to 800 mm | 34.6 | 49.4 | 79.0 | 123.5 | 197.6 | 316.1 | 494.0 | 790.4 | 1234.9 | 1975.9 | 3161.4 | 4939.7 | 7903.5 | 12349.3 |
| Over 800 to 1000 mm | 39.7 | 56.8 | 90.8 | 141.9 | 227.1 | 363.4 | 567.8 | 908.4 | 1419.4 | 2271.1 | 3633.7 | 5677.7 | 9084.3 | 14194.3 |
| Over 1000 to 1250 mm | 46.0 | 65.7 | 105.2 | 164.3 | 262.9 | 420.6 | 657.2 | 1051.5 | 1643.0 | 2628.9 | 4206.2 | 6572.1 | 10515.4 | 16430.3 |
| Over 1250 to 1600 mm | 54.3 | 77.6 | 124.1 | 193.9 | 310.3 | 496.4 | 775.7 | 1241.1 | 1939.2 | 3102.7 | 4964.4 | 7756.9 | 12411.0 | 19392.1 |
| Over 1600 to 2000 mm | 64.8 | 92.6 | 148.1 | 231.4 | 370.2 | 592.3 | 925.5 | 1480.9 | 2313.9 | 3702.2 | 5923.5 | 9255.4 | 14808.7 | 23138.5 |
| Over 2000 to 2500 mm | 77.3 | 110.4 | 176.7 | 276.1 | 441.8 | 706.8 | 1104.4 | 1767.1 | 2761.1 | 4417.7 | 7068.3 | 11044.3 | 17670.8 | 27610.7 |
| Over 2500 to 3150 mm | 93.3 | 133.2 | 213.2 | 333.1 | 533.0 | 852.8 | 1332.5 | 2132.0 | 3331.2 | 5330.0 | 8528.0 | 13325.0 | 21320.0 | 33312.4 |