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Chinese National Standard Category: Cutting tools

English Title: Subland twist drills for holes prior to tapping screw threads. Part 1: The types and dimensions for subland twist drills with Morse shanks
Chinese Title: 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
Standard No.: GB/T 6138.2-1997
Category No.: J41
Issued by: CMIF
Issued on: 1997-08-28
Implemented on: 1998-6-1
Status: superseded
Superseded by:GB/T 6138.2-2007 Subland twist drills for holes prior to tapping screw threads -Part2:The types and dimensions of Subland twist drills with Morse typer shanks
Superseded on:2007-11-1
Abolished on:
Superseding:GB 6139-1985
Word Count:1500 words
Similar Standards: GB 1440-1985   GB 1121-1985   GB/T 1109-2004   JC 340-1992(1996)   GB/T 14299-1993   GB/T 1142-2004   GB 1436-1985   GB 1127-1981   GB/T 3832.1-2004   GB/T 1135-2004   GB 6129-1985   GB/T 4261-1984   GB/T 4251-2004   GB/T 4267-2004   GB/T 3832.3-2004   GB 6134-1985   GB/T 14329.1-1993   GB/T 3832.2-2004   GB 1437-1985   GB/T 4253-2004  
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