ISO-2306 › Drills for use prior to tapping screw threads
ISO-2306
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1ST EDITION
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CURRENT
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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.
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25.100.30 (Drills, countersinks, reamers)
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Document Number
ISO 2306:1972
Revision Level
1ST EDITION
Status
Current
Publication Date
July 1, 1972
Committee Number
ISO TC 29/SC 2