1.1 This standard contains in its first section the table of is metric threads, with the basic is profile for triangular threads, regardless of what they are intended for and for diameters from 0.25 to 300 mm. The second section contains tables of is metric threads, with the basic is profile for triangular threads, for screws and for diameters from 6 to 39 mm. 1.2 Each industry or company will be able to choose for itself, selecting the threads that appear in the tables, the diameter and pitch combinations most appropriate to its own needs.
NORVEN 24-8-1963 history
1963NORVEN 24-8-1963 ISO compliant screws, metric weights and measures