ISO 3439-1975 标准详情
- 标准号:ISO 3439-1975
- 中文标题:自攻螺纹前的带孔直柄阶梯螺旋钻头
- 英文标题:subland twist drills with parallel 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:1975-09-01
Lays down only metric dimensions, which are the only recommended dimensions in the future for these subland twist drills. The drills have been designed to produce holes prior to tapping metric threads over selected range of M 3 to M 14. Unless otherw
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