FQ series bayonet waterproof circular connectos are make according to the standard SJ/T10497. These connectors increase waterproofing characteristics on the Q basis, the number and arrangement fo contacts is as same as the products of Q series. These connectors have the features of high reliability, anti-vibration, high sealed characteristics, plugs and receptacles quickly mating and unmating, user-friendly and easy to use and so on. They are widely uesd for the electric circuit connection between elcetic equipment and various electronic equipment.