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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 6139-2007 |
Subland twist drills - Technical specifications 阶梯麻花钻 技术条件 |
China National Standards Subland twist drills |
 English PDF |
| GB/T 6138.2-2007 |
Subland twist drills for holes prior to tapping screw threads - Part 2: The types and dimensions of Subland twist drills with Morse typer shanks 攻丝前钻孔用阶梯麻花钻 第2部分：莫氏锥柄阶梯麻花钻的型式和尺寸 |
China National Standards Subland twist drills |
English PDF |
| GB/T 6138.1-2007 |
Subland twist drills for holes prior to tapping screw threads - Part 1: The types and dimensions of subland twist drills with cylindrical shanks 攻丝前钻孔用阶梯麻花钻 第1部分：直柄阶梯麻花钻的型式和尺寸 |
China National Standards Subland twist drills |
English PDF |
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