This part of IEC61076 describes circular connectors M8 screw-locking or with nominal diameter 8mm snap-locking, typically used for industrial process measurement and control. These connectors consist of fixed and free connectors either rewireable or non-rewireable. Male connectors have round contacts of diameter 0,6mm, diameter 0,7mm and diameter 1,0mm. Throughout this detail specification, dimensions are in mm. NOTE M8 is the dimension of the thread of the screw-locking mechanism of these circular connectors.