M8 Circular Connectors Bulgin M8 Circular Connectors are compact sensors and automation connectors with screw lock coupling. These connectors are mechanically and chemically robust, easy to install, minimize downtime, and help to increase production efficiency. The M8 connectors ensure safe, secure and reliable protection from liquids, dust, moisture, and dirt providing great resistance against vibrations. These connectors feature straight and right-angled configurations, 3, 4, or 5 contacts, metal and plastic shell options, environmental protection, and field-installable connectors. Typical applications include process control, industrial machinery, and factory automation.