GB/T 39645-2020
ActiveTechnical drawings—Symbols for geometrical tolerancing proportions and dimensions
技术制图 几何公差符号的比例和尺寸
Application Summary AI generated
This standard specifies the proportions and dimensions for symbols used in geometrical tolerancing on technical drawings. It is applied in engineering design, manufacturing, and quality inspection across industries such as mechanical, automotive, and aerospace to ensure consistent and unambiguous representation of geometric tolerances in technical documentation.
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