ISO 3438:2003 lays down the dimensions of subland twist drills with Morse taper 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 M8 to M30. ISO 3438:2003 complements ISO 2306.
Status : WithdrawnPublication date : 2003-09
Edition : 2Number of pages : 3
Technical Committee:Tools with defined cutting edges, holding tools, cutting items, adaptive items and interfaces