Subland twist drills with Morse taper shanks for holes prior to tapping screw threads
Lays down only metric dimensions, which are the only recommended dimensions in the future for subland twist drills. The drills have been designed to produce holes prior to tapping metric threads over a selected range of M 8 to M 30. Unless otherwise stated, these drills will be rigth-hand cutting. Supplements ISO 2306.
A standard is reviewed every 5 years
Revisions / Corrigenda