ISO 5408:2009

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ISO 5408:2009 is an international standard that defines terms and definitions for screw threads. It applies to both symmetrical and unsymmetrical threads, as well as cylindrical and taper threads. 

ISO 5408:2009 specifies the fundamental terms and definitions for screw threads. These terms are applicable to symmetrical threads and unsymmetrical threads, or cylindrical threads and taper threads.