ISO 3439-2003 标准详情
- 标准号:ISO 3439-2003
- 中文标题:攻丝前先钻孔的直柄阶梯麻花钻
- 英文标题:Subland twist drills with cylindrical shanks for holes prior to tapping screw threads
- 标准类别:国际标准化组织标准ISO
- 发布日期:2003-09
ISO 3439:2003 lays down the dimensions of subland twist drills with cylindrical shanks for holes prior to tapping screw threads. The drills have been designed to produce holes prior to tapping metric threads (coarse pitch series) over a selected rang
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