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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 39542.1-2020 |
Mechanical pencils for technical drawings—Part 1: Classification, dimensions, performance requirements and testing 技术制图活动铅笔 第1部分：分类、尺寸、性能要求和试验 |
China National Standards drawings— |
 English PDF |
| GB/T 39542.2-2020 |
Mechanical pencils for technical drawings—Part 2: Black leads—Classification and dimensions 技术制图活动铅笔 第2部分：黑铅芯 分类和尺寸 |
China National Standards drawings— |
English PDF |
| GB/T 39542.3-2020 |
Mechanical pencils for technical drawings—Part 3: Black leads—Bending strengths of HB leads 技术制图活动铅笔 第3部分：黑铅芯 HB铅芯弯曲强度 |
China National Standards drawings— |
English PDF |
| 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 drawings— |
English PDF |
| GB/T 4459.7-2017 |
Technical drawings—The detailed simplified representation of rolling bearings 机械制图 滚动轴承表示法 |
China National Standards drawings— |
English PDF |
| GB/T 4460-2013 |
Mechanical drawings—Graphical symbols for kinematic diagrams 机械制图 机构运动简图用图形符号 |
China National Standards drawings— |
English PDF |
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