Taiwan Provincial Standard of the People's Republic of China
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CNS 505-1978
Scope
This standard specifies the metric fine thread; the datum profile, formula and basic dimensions of the pitch 4 mm. Reference 1: This fine thread is the same as ISO 261-1973.
CNS 505-1978 history
1978CNS 505-1978 ISO Metric Fine Screw Threads (Diameters from 42 to 300 mm and Pitch 4 mm)