The PHOENIX CONTACT part 1641688 is a universal sensor/actuator connector that is designed with a 4-position configuration. It features a straight M12 socket with an A-coded design for secure connections. The connector uses an insulation displacement connection method, making it easy to install. The knurl material of this connector is made from zinc die-cast and is nickel-plated for added durability and protection against corrosion. This connector is suitable for external cables with a diameter ranging from 3.5 mm to 6 mm.