according to ISO 724
The dimension system for threads is based on the nominal dimensions for thread, pitch and minor diameter.
![basic concept and nominal dimensions](/-/media/bossard-group/website/images/engineering/technical-resources-new/en/basic-concept-and-nominal-dimensions.png?la=en-cn&hash=3F90D35FAC5AAFA8C6F0DC49682DDDBD)
according to ISO 724
The dimension system for threads is based on the nominal dimensions for thread, pitch and minor diameter.