GSO ISO 2306:2013
ISO 2306:1972
Gulf Standard
Current Edition
·
Approved on
31 December 2013
Drills for use prior to tapping screw threads
GSO ISO 2306:2013 Files
English
5 Pages
Current Edition
Reference Language
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GSO ISO 2306:2013 Scope
This International Standard specifies the sizes of drills to be used prior to tapping parallel screw threads of normal length of engagement, the drill diameter being approximately equal to the nominal diameter of the thread minus the pitch.
Drill sizes are given for the following threads:
1) ISO metric threads (coarse and fine pitch series): Tables 1 and 2.
2) ISO inch threads (UNC and UNF): Tables 3 and 4.
3) Pipe threads: Tables 5 and 6
This International Standard specifies metric diameters of drills, which, except for the four sizes indicated by an asterisk, have been selected from ISO/R 235, and the dimensions shall be regarded as the only recommended dimensions to be used in the future for this purpose.
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