BS ISO 3439-2003 攻丝前先钻孔的柱柄阶梯麻花钻

标准号：BS ISO 3439-2003
中文标准名称：攻丝前先钻孔的柱柄阶梯麻花钻
英文标准名称：Subland twist drills with cylindrical shanks for holes prior to tapping screw threads
标准类型：J41
发布日期：2003/9/16 12:00:00
实施日期：2003/9/16 12:00:00
中国标准分类号：J41
国际标准分类号：25.100.30
适用范围：This International Standard 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 range of M3 to M14. This International Standard complements ISO 2306. Subland twist drills with Morse taper shanks for holes prior to tapping screw threads are dealt with in ISO 3438.