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How to determine which national standard to use for stamping parts without dimensional tolerance?

There are no fixed rules for the method of choosing the value without tolerance, which is usually based on the technical requirements of the drawings. Usually, the column of technical requirements will explain the value method of unmarked tolerance, such as giving the tolerance value directly or referring to a certain level of a certain standard. In the absence of explanation, the value can usually be taken according to the use industry of stamping products. It is easy to understand, for example, the accuracy level of electronic stamping parts and automobile stamping parts is definitely different.

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As far as the above three national standards are concerned, please refer to GB/T 15055 "Blanking Tolerance Limit Deviation of Stamping Parts" as unmarked tolerance suggestions. The unmarked tolerance values in GB/T 1804 are widely used, such as turning, milling, planing and grinding. Of course, stamping is also possible, but it is not as specific as the former. GB/T 139 14 "Dimensional Tolerance of Stamping Parts" is also a reference and guiding standard for tolerance selection of stamping parts, which tends to determine the dimensional tolerance level when designing stamping products, and is used to improve the unity and standardization of tolerance selection in stamping industry. Of course, it can also be used as a reference when there is no tolerance in production and processing.