Active standard | Published: 01/07/1972

ISO 2306:1972

Drills for use prior to tapping screw threads
(Forets pour avant-trous de taraudage)

Available languages: English, French

Available design: electronic design (pdf), Print design

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Detail information

Designation: ISO 2306:1972

Publication date: 01/07/1972

Pages: 5

Country: International technical standard

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Anotation

Description / Abstract: 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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