ISO 2306:1972

Current Revision
Drills for use prior to tapping screw threads

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ISO 2306:1972

Drills for use prior to tapping screw threads

PUBLISH DATE 1972
ISO 2306:1972

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 diameter 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.

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