`T = 10^(0.2*( ITG -1))*(0.45*root3 D +0.001* D )`
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The IT Grade refers to the International Tolerance Grade of an industrial process define in ISO 286. This grade identifies what tolerances a given process can produce for a given dimension. This specific tolerance for a particular IT grade is calculate via the following formula: `T =10^(0.2*(ITG-1))*(0.45*root3D+0.001*D)`, where:
`T` = tolerance
`ITG` = IT Grade, a positive integer
`D` = geometric mean dimension Think of `D` as being the key dimension on the part and `T` as being the required tolerance on the key dimension. The larger `ITG`, the looser the tolerance.