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ISO 2306:1972
M00001103
New product
ISO 2306:1972 Drills for use prior to tapping screw threads
standard by International Organization for Standardization, 07/01/1972
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Full Description
Specifies the sizes of these drills for ISO metric threads (tables 1 and 2). ISO inch threads (tables 3 and 4) and pipe threads (tables 5 and 6). Applies to screw threads of normal length of engagement, the drill diamter being approximately equal to the nominal diameter of the thread minus the pitch. The sizes (except for those sizes indicated by an asterisk) have been selected from ISO 235 and are to be used in the future.