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ISO 263:1973
ISO inch screw threads - General plan and selection for screws, bolts and nuts - Diameter range 0.06 to 6 in
Tabulates inch threads having the basic profile for triangular threads specified in ISO 68; contains sizes in the diameter range between 0.06 to 6 inch, comprising a number of series of diameter/pitch combinations, together with a system of thread designations.
International Organization for Standardization [iso]