Precision Machining Tips

Jun 05, 2025

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IT is a unit of measurement for machining accuracy, mainly used to measure the accuracy, quality, and machining error of manufactured products. The larger the value after IT, the lower the accuracy and the larger the error. For example, IT9 is rougher than IT5. There are 20 tolerance levels from IT01, IT0, IT1, IT2, IT3 to IT18.

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