M00000816
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ISO 3438 3rd Edition, May 1, 2013 Subland twist drills for holes prior to tapping screw threads
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Availability date: 07/13/2021
Description / Abstract:
This International Standard specifies the dimensions of subland
twist drills with Morse taper shanks and cylindrical shanks for
holes prior to tapping screw threads.
The drills are designed to procedure holes prior to tapping
metric threads (coarse pitch series) over a selected range of:
- M8 to M30 for subland twist drills with Morse taper
shanks;
- M3 to M14 for subland twist drills cylindrical shanks.
This International Standard complements ISO 2306.
The relationship between the symbols of this International
Standard and those according to the ISO 13399 series is given for
information in Annex A.