3 pin 4 pin 5 pin, Supply M5 miniature circular connectors with diameters of 6 is the minimum size of the connector industry ele|pin socket connector| connector automotiveconnector rj-45 - AliExpress
Miniature connectors in various versions
Circular connectors | Phoenix Contact
M5 Connectors | IP67/IP68 Waterproof | NorComp
M5 small waterproof connector | Taiwantrade.com
Mini 3 Pin DIN Male Solder Connector - Plastic | ShowMeCables.com