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