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English
The tolerance grade refers to the grade to determine the accuracy of the size, the NATIONAL standard is divided into 20 grades, from IT01, IT0, IT1, IT2 ~ IT18, the greater the number, the lower the tolerance grade (machining accuracy), the greater the allowable size variation range (tolerance value), the less difficult the processing.
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2022-03
Basic knowledge of metal materialsMetal material refers to metal elements or mainly composed of metal elements with metal properties of the material. Metal materials include pure metal, alloy, metal materials intermetallic compounds and special metal materials.
