GB/T 6138.1-2007
AbolishedSubland 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
Application Summary AI generated
This standard specifies the types and dimensions of subland twist drills with cylindrical shanks used for drilling holes prior to tapping screw threads. It is applied in general mechanical manufacturing and machining industries to ensure proper hole preparation for subsequent threading operations, particularly in production environments requiring standardized drill geometries for consistent thread quality.
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Transparency note: The application summary and key sentences on this page were automatically generated by AI from the standard's original text. This content has not been human-verified and should not be used for compliance or regulatory purposes. Always refer to the official standard document from the issuing authority.