标签： Tolerance classes
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![[Processing Knowledge] What Is The Accuracy "tolerance Level" Of Turning, Milling, Planing, Grinding, Drilling, And Boring?](https://endlfh.com/wp-content/uploads/2026/09/1790360002760_0.jpg)
[Processing Knowledge] What Is The Accuracy "tolerance Level" Of Turning, Milling, Planing, Grinding, Drilling, And Boring?
Tolerance level refers to the level that determines the degree of dimensional accuracy. The national standard stipulates that it is divided into 20 levels, from IT01, IT0, IT1, IT2 to IT18. The larger the number, the lower the tolerance level, the greater the range of allowable changes in size, and the less difficult the processing.