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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 39645-2020 |
Technical drawings—Symbols for geometrical tolerancing proportions and dimensions 技术制图 几何公差符号的比例和尺寸 |
China National Standards Dimensions,proportions |
 English PDF |
| GB/T 12212-2012 |
Technical drawings - Dimensions,proportions and simplified representation for welding symbols 技术制图 焊缝符号的尺寸、比例及简化表示法 |
China National Standards Dimensions,proportions |
English PDF |
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