ISO 6411:1982 Preview
Technical drawings -- Simplified representation of centre holes
This standard was last reviewed and confirmed in 2014. Therefore this version remains current.
This representation mode may be used particulary when it is not necessary to show the exact form and size and where the designation of standardized centre holes is sufficient for information. Annex A gives the dimensions for types R, A and B, and Annex B the proportions and dimensions of symbols.
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