BS EN 3645-004. Aerospace series. Connectors, electrical, circular, scoop-proof, triple start threaded coupling, operating temperature 175°C or 200°C continuous. Part 004. Receptacle, hermetic, square flange mounting. Product standard|Quality assurance, Synthetic rubber, Natural rubber, Air transport engineering, Aircraft engineering, Connectors (electric), Marking, Torque, Weight (mass), Size, Hose connectors, Pipe connections, Hose clips, Clamps (mechanical), Damp-air tests, Environmental testing, Damp-heat tests, Electric cables, Optical fibres, Fibre optic cables, Fibre optics, Locking and locating devices, Fibre optic connectors, Electric contacts, Environment (working), Electrical components, Seatings, Hermetic sealing, Circular shape, Flanges, Dimensions, Electric connectors, Square shape, Aircraft components, Temperature, Electric sockets, Threaded components, Designations, Quality assurance systems, Circuit-breakers, Alloys, Nickel alloys, Non-ferrous alloys, Shape, Diameter,