OS GSO ISO 3439:2012
ISO 3439:2003
Omani Standard
Current Edition
·
Approved on
31 December 2012
Subland twist drills with cylindrical shanks for holes prior to tapping screw threads
OS GSO ISO 3439:2012 Files
Arabic
4 Pages
Current Edition
OMR
20.37
English
3 Pages
Current Edition
Reference Language
OMR
20.37
OS GSO ISO 3439:2012 Scope
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.
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